I really hate it when the coil starts to slip or unravel without the coil itself not even burning. Mainly on cheaper subs. Just because the coil can handle 500 degrees. Doesn't mean that the glue and former can take the abuse.
@loganmilam4065
3 жыл бұрын
like when you cant even smell them and they just blow on like 100w extra?
@abelscaliber7969
2 жыл бұрын
@@loganmilam4065 literally lol
@621ELECTRONICS
3 жыл бұрын
"I love the smell of burnt voice coils in the morning"
@jayebonia8108
6 жыл бұрын
looks like CSI in car audio
@billybullfrog
6 жыл бұрын
k ebonia Grissom forgot to wear his rubber gloves
@mysock351C
4 жыл бұрын
Also fun fact about the Brazilian amplifiers is they use _extremely_ high voltage rails to drive the bridged amplifier section, often without filtering. Im guessing the higher multi-kW ones run at about 160V from the 200V capacitors often seen. This combined with lack of filtering allows for less current to be used for the same drive power, and thus fewer switching transistors. The downside is if the voice coil suffers a broken section (and no inductance), the voltage will basically shoot straight up to the rail voltage since there's no filtering on the class-D output, and thus flash over, causing all the melted and burned sections seen.
@negativezero3107
3 жыл бұрын
if it suffers a broken section it is already dead, usually caused by low voltage supplied to the amp anyhow, they just try to overcompensate, just need an amp good enough to shut off when your volatge is shit.
@mysock351C
2 жыл бұрын
@nate0 Obviously you wouldn't, just like you wouldn't want to continue to run an engine with a rod knock, but it happens. A typical scenario would be multiple subs and you might not hear one is failing right away, so it ends up nuking itself in the process. Since the voice coil has a fair bit of inductance, if the amp has no output filtering and no proper clamping on the output, it can generate quite a lot of back-EMF if the coil opens up, thus leading to flashover. Don't know how many were/are susceptible to this, but its a distinct possibility since filterless class-D is really for undemanding things like consumer electronics, not high power car audio amplifiers. These also have the undesirable characteristic of having substantial voltage on the speaker terminals even with the amp idling since each terminal will be toggling between the two respective power rails.
@danielbujold7262
2 жыл бұрын
Your "fun fact" about Brazilian amplifiers is completely incorrect. Brazilian amps being "extremely high voltage" is an old myth/misconception. Brazilian (full bridge) amplifiers use much lower rail voltage than their half bridge counterparts.
@mysock351C
2 жыл бұрын
@@danielbujold7262 First off, a full-bridge amplifier doesn't use "much lower voltage", it just doesn't have a bipolar power supply. Half-bridge designs have to have + and - rails to be able to provide the full swing about the ground reference. With a full-bridge design, the bridge does the polarity flipping, so only one rail is needed. That said, the rail must provide sufficient voltage to actually drive the load, and as such will use similar voltages as the half-bridge amps, but just with only one rail, and half the number of rail caps. Just doing some basic math, 2 kW RMS into a 2Ω load requires 63V RMS, or 88V peak. In a full-bridge design, this would be 90V at the rail. In a half-bridge design, this would be ±90V.
@mysock351C
2 жыл бұрын
@@danielbujold7262 And I think that may have come from a barevids video where he looked at the outputs of a full-bridge amp. That can cause some confusion since normally just one output will be swinging while the other sits at ground. Off the top of my head, the outputs on a full-bridge should be of opposite phase to add up to the full drive voltage once the drive signal has passed thru the filter networks.
@Supercharged1976
7 жыл бұрын
The coil that had the 10k on it, how much was the sub rated for rms? 3" I'm guessing between 2500-3000? So a 10k even after decent rise would still be around 5000 minimum. I think you said it best this is the only hobby where people will push stuff 2-3x past what it's rated for then still blame the product. LOL!
@EMFAudio
7 жыл бұрын
Flexin Five Hundred 2,500 rating on that sub. It didn't last long on that amp.
@1452-w3b
5 жыл бұрын
LOL depending on the coil 1200 or so RMS+
@mddunlap03
5 жыл бұрын
Or they buy a 1k amp and crank the gain all the way up trying to get 3k out of it then blame a sub for dying not knowing it was basically being fed dc and being used as a space heater
@Chuck_Sanders
2 жыл бұрын
I remember some car audio company's, were not listing RMS ratings, and when asked about it, they would tell you that "if you have to ask, it's not the sub for you" but, that has been awhile. No voice coil is "rated for power" and that's a huge misconception, and anyone that tells you otherwise, is just trying to push a product. And on a side note, the difference in the color of the enamel, depends on how hot the coil was baked for curing, and or how the process was done.
@COMPASBASSCHICALI
7 жыл бұрын
Forensics that really sounds funny man but still serious because that knowledge rigth there👍
@lm6036
5 жыл бұрын
The clipping itself isn't the cause of loudspeaker failure, it's the symptom of the problem, i.e. 'not enough rig for the gig' your hitting the end stop on the amp (and speakers if powered properly) and most likely going well past them. Lost of people, especially nearer the bottom end of the game, tend to have mediocre amps (and speakers) and push them to hard to get anywhere near enough SPL (also an amp driven hard into clipping sounds louder which add's to the issue), while a system powered with an amp that is rate at the same RMS figure as the drivers sounds like a good idea, once it's driven hard it's then producing far more output (with far more distortion) and the drivers get burnt. The statement that clipping damages voice coils is probably slightly wrong (or being answered slightly wrong), as clipping itself does not damage speakers, but it usually indicates there is a problem that will result in a loudspeaker failure. A lot of Synths used in many EDM genres can produce square waves and a lot of producers use them. Especially in genres like hardstyle/hardcore. And they don't damage the speakers. Go and try it. Create a square wave and sent it BELOW rated RMS through your sub woofer. It will sound ugly but it won't damage the driver. Distortion is also not what causes damage to a speaker. But it can indicate that your are at A limit. Be it your amps output or your drivers mechanical limits. Heck, guitar amps sound the way they sound because of distortion and they last for years if used properly.
@EMFAudio
5 жыл бұрын
.....but clipping DOES damage coils, and leads. Obviously there is a problem if there is clipping, like the recording is bad, or the amp is overdriven, but neither of those things causes a problem for anything but the speaker. In the instance of using square waves in the recording, with enough output it will absolutely damage speakers. Remember the root cause is heat. 1 watt of square wave can't generate enough heat to kill the oil nor does it have the amplitude to kill a lead. Distortion from a guitar in a recording is the same way, but not nearly as aggressive. There are sharp peaks, not flat spots. The flat spots is what does the most damage.
@lm6036
5 жыл бұрын
@@EMFAudio Yeah but like you said yourself it's the heat. Clipping in and out of itself, as basically a less aggressive square wave is not something a driver by dentition cannot handle. The problem is that clipped sound (and square) generates more heat per given wat due to poor ventilation when the coil is moving less, EMF (ironic name :P) no longer provides additional resistance when the coil stops moving so your coil can get even more power too fast if the amp allows for it. If you RMS match your driver and amplifier you can certainly blow your woofer very easily when you notice clipping because for one, you are already at the limit of both your amp and driver. And now you are pushing the amp even more when you put it in clipping territory. So you are getting more stained power then the woofer can already handle and the additional heat build up of straight cut of sections. Got a car install with a subwoofer that can handle 1000 rms 2500 peak. It's supplied by a amp that can deliver 500 watts rms and 800 peak. Even when maxed out on the amp, with some minor clipping the woofer is as new. Clipping in and of itself is not bad. It's the additional heat it generates that can cause damage if the amp is powerful enough to provide enough power.
@denverdan13
5 жыл бұрын
Great videos man. You just gained a new subscriber
@jorgem50
2 жыл бұрын
One of the most powerful amps I've ever owned is a Taramps. Been running for 3 months no issues.
@john200871
2 жыл бұрын
I watched this video while waiting for a delivery, every time I heard that back up alarm I started looking around IRl.
@joncarolineconnors2612
2 жыл бұрын
Question: So if the coil started out as a bright shiny copper & turned dark, is it still good as long as the glue hasn't melted? Or the coil hasn't come loose?
@jamest.5001
6 жыл бұрын
yes I have been out of audio for a few years. that's why I have just discovered this company. from what I have seen. its an A OK #1 company. now its time to hear and feel some subs in action. I like extremely clean bass. hope they van deliver. because I love the looks!
@EMFAudio
6 жыл бұрын
Pick some up and judge for yourself, you can order any time at www.emfcaraudio.com
@pospc2
5 жыл бұрын
I asked the other day in a comment on another video how to tell if was caused by over power or clipping. This helps. Guess i should have watched more of your videos.
@tonykartracer8032
6 жыл бұрын
Whatever....... I still want my refund. :)
@3a.m.284
6 жыл бұрын
Tony Kart Racer well you're not getting it if your fuckwit ass purposely destroyed a subwoofer. you can't drive your car off a cliff and expect to get a new one.
@rickeystovall7547
6 жыл бұрын
@@3a.m.284 u😥
@TheZombieSlayer1155
5 жыл бұрын
@@3a.m.284 /r woooooooosh
@1452-w3b
5 жыл бұрын
Just because mama gave you your favorite Truckee every time you asked dosent mean every time you ask for a refund you're going to get one
@AllaboutTheWoodrows
4 жыл бұрын
金3 A.M. sure ya can it was stolen
@iamlegend81gaming
5 жыл бұрын
Great video.good bass knowledge.keep bringing that bass.
@brettaylor2661
5 жыл бұрын
Thanks for the video. I'm about to cut open my sub that quit working and see what it looks like in there.
@negativezero3107
3 жыл бұрын
what does make the coil better is that it is OFC not aluminum.....and the coil is not darkening the glue is
@EMFAudio
3 жыл бұрын
What happens when you burn things? It turns black. How do you burn things? Excessive heat. How do you get excessive heat? Excessive power. The glue makes it start dark, too much power makes it darker. Copper nor aluminum is a better coil, which application it's used makes it a better coil.
@negativezero3107
3 жыл бұрын
@@EMFAudio yes burning makes it darker, i thought the thing when you were talking about the black super glue Rockville claimed was funny, but i would disagree on coil material, imo aluminum is inferior to OFC due to the resistance of the material, price point of course plays a part, anyhow love your vids.
@Finejunk1
2 жыл бұрын
Very educational. How do the coils look on 120v outlet vs 240v outlet?
@RealPivotTV
Жыл бұрын
The only thing I disagree with on here is that where a customer may abuse a subwoofer and I am sure some people really fry their subs on purpose and then try to blame the manufacturer but manufacturers also are asking for that when they rate their subwoofers with false ratings. Most subwoofers even from some of the top brands are anything but clear on how much power a subwoofer can actually take from a amp. They want to take advantage of newb customers and people who don’t understand that there is no such thing as max power and that if you run that equipment at max power it’s going to fail. They do everything that can to make that “max power” rating the only thing people see so they can be competitive with the other brands that do that. As long as that happens how can you not expect to get burnt up voice coils? Then they say well you put too much on the sub. IMO whatever that max power is you should warranty it for. So since kicker wants to call a 10 inch comp r a 1600 watt sub then if someone pushes 1600 watts through it and smokes it like they will. Then kicker should replace that subwoofer every time….
@mysock351C
4 жыл бұрын
To me the use of the polyamide film on the "500 degree" coils is more to make up for the deficiencies of cheaper aluminum, rather than provide a better, more robust voice coil. A true high temp coil would have both polyamide insulation film and copper wire, which would equate to a much more rugged voice coil.
@EMFAudio
4 жыл бұрын
Copper wire doesn't necessarily make it more rugged. It will handle more current but it also weighs a lot more and generates more inductance, which means efficiency would suffer which in turn handles LESS power.
@mysock351C
4 жыл бұрын
@@EMFAudio The weight is a fair enough point. But the cross-sectional area must be increased to provide the same current handling capabilities, so the weight savings wont be as dramatic, but still can save about 40% over copper, maybe 50% if you decide to push it. But it has one draw back in that its much more sensitive than copper to heat, so it will blow open easier under overload. It may be easier to work, which could aid in fabrication, and also allow the use of non-circular cross-sections for different voice-coil designs to allow for the cross-section needed while still staying in the same gap width. This would be almost a necessity due to the higher eddy current losses in aluminum. This combined with the dynamic resistance will dictate how much heat it dissipates. At normal audio frequencies the series resistance will pretty much dictate that (I^2*R losses), but for some class-D amps this can be very much higher if they are sending the actual switching waveform to the coil without filtering. I will backpedal a bit and say the real advantage would be the use of a non-circular cross-section (e.g. a ribbon as shown) as this would allow for more flexibility in the form-factor (and possibly a lower overall inductance) for a given number of turns in the solenoid coil. But for a circular cross-section, the eddy current losses (and heating) are higher. With that said, there would be advantages if its done properly. Regarding the inductance wont affect efficiency at all. What it will do is make the sub harder to drive since it will be more reactive, and thus lower power outputs are achievable with a given voltage.
@gcorley8938
6 жыл бұрын
Yeah the image dynamics are designed for being able to take apart with having to tear the spider or surround apart. Thanks for your help
@Supercharged1976
7 жыл бұрын
Nice explanation! I know when I used to run a competitors sub (not dropping names) that seems to have issues with coils all the time, and people would get mad because they would always say user error. After seeing this I would be curious how often they get some of those just fried or holed coils and the customer is flipping out saying that it's a crappy sub when they just committed subwoofer homicide. LOL!
@EMFAudio
7 жыл бұрын
I know of one brand we do a lot of recones for locally that have coil problems because they're just crap coils, or should be rated for less power. But, I also know people think a power rating means run double that on it and if it fails it's the products fault.
@jasonpierce6507
6 жыл бұрын
Does that company's name start with a "S" and end in qubed?
@Supercharged1976
6 жыл бұрын
I can't confirm nor deny...but yes it was soundqubed. LOL!
@jasonpierce6507
6 жыл бұрын
Lol...yeah thats what I have heard. But don't get me wrong I have 2 HDC3 15's on 2k each with no issues yet....but they do get warm and I dont full tilt for long. But I have some ZV4 motors coming my way for me build that can handle some abuse and get windy.
@BentonL
2 ай бұрын
I have been getting hate for blowing Kicker solo L7r 12's. Not sure what changed with kicker from 2005 to now. Long story short I destroyed my beloved l5 because I listened to it full power it with a drill on top. I replaced it with a like speaker thinking it was an upgrade. After than I kept blowing the l7's. People blame my amp settings, but I later got a Skar EVL and have not had an issue. The amp I was using was a JP8. Even clipping it I cant see how that would destroy a Solo. I am open to ideas, and sure I am gonna be called a liar. I never tried to warranty a speaker. I am was just disappointed the normal solos can't take abuse any more. I was a die hard kicker guy until 2020. I had no idea Skar was the most hated brand in the world. However I have been very pleased with it. My time to go with Sundown is finally here, but not because skar failed me. Basically Iam wondering what your thoughts are on a Solo L7r running on a D4S JP8 under the worst possible scenario. My L5 lasted all this time until I messed up.
@tommyknight9004
8 ай бұрын
You know what we did to make the voice coil fail but do you know what you did to make your business fail
@cuzimaluzer777
6 жыл бұрын
Low key hilarious video
@bobyblaccc30
7 жыл бұрын
Very good video for the pros and novice subwoofer enthusiasts. Just to show some of you guys out there that we know . #stopscam #weknowwhatyoudidlastsummertoyoursubcoil lol. #rookiesstoptryingtoteachapro
@edfx
Жыл бұрын
3:10 would be this coil still usable when you don't overdrive it anymore?
@apolinarponce4506
2 жыл бұрын
Has manufacturers ever put a temp sensor in the coil to monitor it so you keep the coil happy
@HashDogg06
5 жыл бұрын
What is the main benefit from a aluminium coil? better cooling capabilities, power handling, less weight in the moving mass?
@AnnaVannieuwenhuyse
5 жыл бұрын
Generally less weight. Electrically, aluminium is inferior. They require more engineering to get them on a decent efficiency. Luckily, most of that is already figured out and 'public domain' knowledge.
@ericcameron281
3 жыл бұрын
I know how to build a voice coil that will never burn out, never unwind, and has almost zero resistance making it much more efficient than, and produce a much stronger magnetic field than traditional voice coils,.
@EMFAudio
3 жыл бұрын
No resistance isn't possible, nor would it even work because amplifiers wouldn't make power as they'd turn on in protect. The coil doesn't produce the magnetic field, the... MAGNETS, do, and the top plate and pole harness it.
@emmittbishop4783
6 ай бұрын
Totally different item but exact same circumstances. I was an ATM tech for 10 or so years and I would go on a service call and I would get these long drawn out C.M.A. explanations of what happened to the machine from the bank employee. They had no idea that I know literally everything that happened to it because I can eyeball it and be right 9 times out of 10 but also the damned thing keeps record of everything that occurs. I would listen just to make an assessment of how much of a bullshitter the clerk was.
@14U2C
3 жыл бұрын
So if a sub has 1 year warranty and it blows for whatever reason is it still covered under warranty?
@EMFAudio
3 жыл бұрын
Warranty typically states manufacturer defects are covered, not because it's broken for any reason. If you clip the hell out of it, nobody is going to warranty that. If you're using it outside of specifications, like more than rated power or the enclosure is way too big or way too small, nobody is going to warranty that.
@generalporfirioggonz
7 жыл бұрын
So the dust on the last coil was cause by current arching, do this is related to Brazilian amps having a really high voltage power rail?
@EMFAudio
7 жыл бұрын
The dust is smoke residue.
@davidclark6247
4 жыл бұрын
So what do you do when some immoral person sends in his burned coil for undeserved warranty work? Cheaters tend to get nasty when they get caught! I hope that fact doesn't deter you from doing what's right.
@negativezero3107
3 жыл бұрын
they do have a high power rail, a lot like the HCCA amps and others, but the cause is lack of supplied voltage to the amp i would think and possible poor filtering or boosts from the caps inside, it is not a steady voltage and is usually because people try to overpower with cheaper amps without extra batts better alts ect ect, and well cheap amps just are what they are, they are cheap for a reason.
@jasonlee6392
4 жыл бұрын
So what’s dirty power is that under powered and clipped
@EMFAudio
4 жыл бұрын
No such thing as under powered. By the logic of what that's considered, if you don't have rated power on it, it's under powered. Turn the volume down, under powered.
@epsoncharles4512
2 жыл бұрын
What gives rms power, the coil or the magnet
@Jlaudiomustangs10
5 жыл бұрын
I have 2 EMF ermagerd 18s from a guy in canada that had 6... he had clean power on them and the coil went on him at his first show....they all got PSI recones and I have 2 playing in my car now. It makes me wonder how the original coils went so fast. He had crossfire 8ks on them 6 of them. It would have been a beast if he didnt give up on it.
@karthikeyay2988
4 жыл бұрын
6:00 how many spiders are there??
@qrelectronicrepair1802
2 жыл бұрын
The same thing goes for amplifier repair , we know what you did how you live and voltage you run. In the amplifier rework world its always just the rca inputs or a "fet" that needs to be replaced. Ha
@TimpBizkit
6 жыл бұрын
Clipping is known to send disproportionate amounts of power to tweeters in full range speakers, but does it really make much difference on a sub, other than just extra power going to the coil in general? Running continuous bass tones near tuning or higher bass frequencies will generate lower impedance and also cause less coil movement that would evict heat from a vented pole piece. Excessive burst power could damage suspensions and spiders, yank coils away from cones or cause coil turns to come unglued if they aren't up to snuff. Bottoming out can dent coils, causing permanent rub.
@EMFAudio
6 жыл бұрын
Yes, it does matter on a sub. You CAN hear it, and it also just dumps heat. Less coil movement would INCREASE heat at that coil, pole venting isn't doing much of anything, and pole air isn't where the bulk of the heat is. Excessive burst power (within reason) only damages the sub if it's designed and built poorly. A good design won't bottom out and dent the coil, and breaking glue joints is just poor assembly. None of those are things our subs experience. We intentionally put over 7x rated power on them for a burst without failure.
@dsmdallas2466
6 жыл бұрын
GREAT VIDEO! QUESTION: I have never had a subwoofer bottom out. Alpine 8" type R dual 2 ohm rated350 watt rms per coil. being powered by alpine MVR 250 ( 250 watt at 2ohm 150 watt at 4 ohm ) wired at 1ohm. I only hear the tick of what I assume is a voice coil tap against the magnet. Would this be caused by 1ohm wiring? or Air leak in sealed box? or just over power?
@EMFAudio
6 жыл бұрын
DSM Dallas You may be hearing light clipping from running it at 1 ohm. Typically if you're tapping the coil on the backplate you don't do that too many times before it's destroyed. Now, I think it's also impossible to do that on that sub so it might also be mechanical noise from the spiders or maybe lead slap on the cone.
@dannyfehr4689
6 жыл бұрын
I've had a couple subs back in the days where spider just wasn't glued properly and the spider came loose. Luckily, in each case, all I had to do was reglue it and it fixed the problem.
@bainmccartney685
5 жыл бұрын
What is that fiberglass tape called above the coil winding that holds the glue on the spider? The stuff all over the top of the form? I remember it just as fiberglass tape but i cant find the right stuff to buy
@4strength
3 жыл бұрын
Do you have an example of a defective coil?????? Or in your mind are all coils not defective??
@EMFAudio
3 жыл бұрын
A coil might be defective if it has a break in the wire as a result of fatigue with added stress from heat. There could also be a premature glue failure. I've seen it very few times, never from our own equipment.
@dhiea289
Жыл бұрын
So even if the coil turns black but no bubbles or rubbing sound, its still good?? Or still needed to re-cone???... Or i can still use the sub and supply it with the rated power it has.... Or underpower it for safety?? Because my uncle gave me a 12inch sub 1K rms 16kg heavy, and I noticed that the coil is black like charcoal, not like the brand new one that copper color, but when i test it, it's still good sounding no coil rub or what so ever...
@sabarlow80
3 жыл бұрын
Is there anything to the myth about black high temp epoxy being better than clear
@EMFAudio
3 жыл бұрын
Nope, it's a marketing myth.
@nickolasvaughn667
2 жыл бұрын
So I had a cheap SDR 15 but I have a good audio Dynamics amp with the bass knob I was playing it and I turn on one song and all of a sudden the sub started to sound like s*** sounded like the coil was coming undone but so when I went back to the box I could smell it so I took it out anyways I'm looking at the coil right now it has the regular copper coil but like you showed on the black one that has gaps it has a whole bunch of gaps like that but it's not black at all but it really don't play anymore because I had it hooked up in the house and it got worse and worse sounds like s*** basically you're saying I was overpowering it but isn't overpowering basically clipping because if you're overpowering it it's going to burn the voice coil
@MarkyMark-lp3op
2 жыл бұрын
My sub is 1ohm sub but multimeter reads 1.5 is it still good when I press on the cone hear nothing pushes in and out just fine
@NinexXo9
5 жыл бұрын
Thanks for the info
@jamarmckay5514
4 жыл бұрын
Which type of wire is at very best to use Like for example : aluminum, copper, gold etc
@EMFAudio
4 жыл бұрын
Copper is the best cost to performance wire. Gold would be better but outrageously expensive. Silver wire would be the absolute best, but again, outrageously expensive.
@robv.o.1777
4 жыл бұрын
Was wondering if you could build a custom voice coil if given exact dimensions. Have an 18" basket and cone, and ss audio 12" motor. A 4" 75 lb motor is silly for a 12" Building a more practical sub...lol. Using 1000-2000 wrms. Might need a few spacers and a standoff, to use the DC audio 18" medium spiders. Also have a dozen or so L7 solobarics to recone with some maxxonics cones.
@EMFAudio
4 жыл бұрын
We don't wind coils, nobody does. It takes specialized equipment to do it, when we get coils made we have to make an entire run of them.
@chanceanderson3085
3 жыл бұрын
On a dual Coil . Would the inner Have a diagonal line all the way top to bottom about ..075 wide
@richardr5888
5 жыл бұрын
I had an Alpine Type R that started sounding horrible. At low volume, you could hear the dreaded scratching. Checked the impedence on both coils and it was fine. Opened her up and all I see is what looks like copper rubbed off (aluminum showing?). It's only in one tiny spot about 4mm wide and only 2 strands tall. It's about 1/2 down on the coil. What would be the cause of that? The only other thing I saw was the former isn't completely closed. There's like a 2-3mm gap. Not sure if it's supposed to be like that.
@EMFAudio
5 жыл бұрын
That sounds like something was in the gap. That was the rubbing sound, and the marks left from it. The former not being closed, at least what you were seeing, is normal.
@tiggywinkle1000
Жыл бұрын
Get something right, chaps ! It's NOT always the user - Take Wharfedale Valdus 300 - Only buy these vintage speakers if you're ready to pay again for new drivers. All in this range have built in failure - the cone supports are foam rubber - they are all rotted by now, and the cone drops. Naturally, if it's not motoring, it's voice coil is going to get hotter and hotter 'til it f***s up. Thats what happened to mine - so I'd be hunting 'net for spares suppliers, buying new surrounds; New voice coil; spend some hours working on it - and that's assuming repair is 100% OK. No, I'm calling it BER and just buying a brand new alternative woofer - got guarantee that way and it's fitted in 5 minutes. They are garbage; not the Wharfedales I remember.
@whoismarkjones9283
3 жыл бұрын
Can you refurbish a coil like the one in 3:20? I have an American Bass HD that ohms out fine but I pulled the drop in and seen a coil just like this but about half as bad. No rub before I pulled it. I was originally fixing cone vibration lol
@AJ-tz6qu
3 жыл бұрын
Great video. What are most of the formers made of?
@EMFAudio
3 жыл бұрын
On the things we typically deal with, aluminum.
@iRichardRD
2 жыл бұрын
this is very simple
@kswis
4 жыл бұрын
Good stuff, I do my best to watch one of your info vids a daySo would you say copper handles heat better or worse than the aluminum?
@EMFAudio
4 жыл бұрын
Copper does handle heat better, but sometimes what it contributes to design aspects can CAUSE more heat so it ends up being a wash.
@TheXxPSYCHO
2 жыл бұрын
I'm wondering how the diameter of the voice coil wire affects the sound? And if all speakers are made to the same standard Ω why do different speakers sound different?
@ceciljones1248
Жыл бұрын
Thats a good question might have to do with xmax and the motor
@Macho09Marian
7 жыл бұрын
okay fair enough.
@dsb1409
3 жыл бұрын
Does a high temperature paint with the epoxy help to keep the voice coil cool? Or do coils not work well with a high temperature paint applied to them?
@EMFAudio
3 жыл бұрын
Coils aren't painted at all.
@marcmathes41
6 жыл бұрын
will it ruin the motor in basket ever?
@EMFAudio
6 жыл бұрын
Marc Mathes No
@dakyddghost9990
4 жыл бұрын
I was worried about my black coil 😅 thank God mune arent burnt
@negativezero3107
3 жыл бұрын
"well i have an 8000 watt amp" what does your voltage drop to? "it never goes below 13" ............nice coils bro haha
@jeremys8360
3 жыл бұрын
If the amp is made to work at 12.6, it’s not as much of a problem. Just gotta set the gains right
@bobinasdeparlantes..6001
4 жыл бұрын
good day friend. someone to explain how to work with that black pegento, buy it and not how to use it. thanks.
@Dave-ek2jx
4 жыл бұрын
So I have been wondering for a while, is it possible for you to clip your sub if your alternator cannot put out enough power for your amp?
@EMFAudio
4 жыл бұрын
Yes, low voltage will absolutely cause clipping.
@ceciljones1248
Жыл бұрын
Clipped my subwoofers for 5 seconds because I had a unknown voltage drop at full tilt
@bkh5746
3 жыл бұрын
Hell my coil came shitty looking new.i put it in though.couple wires was holding by what looked like imagination.😁
@victormaldonadocordova6191
4 жыл бұрын
Ese adecivo es más efectivo para altas temperaturas
@negativezero3107
3 жыл бұрын
ahaha he is talking about Taramps
@Tekjive
3 жыл бұрын
Hi, I’m looking to buy some specific 3” voice coils, do you sell them separate?
@JuanGabriel-nz9rq
3 жыл бұрын
Where can I take my sub to get fixed
@EMFAudio
3 жыл бұрын
Anyone who can do recones. sometimes people ship them to us but most times it's locals that drop them off.
@jharris212
3 жыл бұрын
I have been watching many videos trying to get a technical answer of what makes a speaker/subwoofer 2, 4, 8 ohm?
@EMFAudio
3 жыл бұрын
I replied to your email.
@jamesg8246
3 жыл бұрын
Has anyone ever had a tiny thermocouple installed in a coil to see if these coils can actually take the power they claim?
@EMFAudio
3 жыл бұрын
A thermocouple wouldn't tell you if it can take power, only if it can take heat. And yes, someone poorly executed that idea and I'm not sure if it's sold anymore. It didn't work very well
@jamesg8246
3 жыл бұрын
@@EMFAudio Yes I know what a thermocouple does. It would tell you if when you give the coil the rated power if it overheats or not or how close it is to its thermal limit, under those conditions. Seems like it would have to be placed between the former and coils and have a thin enough profile to not create a high spot. Just curious.
@richboss1705
2 жыл бұрын
@@jamesg8246🤫
@trunkbangking
5 жыл бұрын
What is the difference and reasoning for different indications of clipping from Chinese Korean and Brazilian.etc?
@EMFAudio
5 жыл бұрын
The waveform is very different. Even under a normal condition they can look different, but when clipped there are often HUGE differences.
@trunkbangking
5 жыл бұрын
@@EMFAudio pretty cool
@germanywho
3 жыл бұрын
good job bro👏👏👏👏
@SQ_Silverado
2 жыл бұрын
Right now my w7 is starting to sound like a slinky on certain bass notes, had to lower my gain but now it hits nowhere near as hard … looks like I clipped it to much
@internationalmasterspeaker1879
2 жыл бұрын
Wow idol coil
@river86012
3 жыл бұрын
How do you determine how far the voice coil should be put down in the ring at the bottom of the basket? Is there a measurement from top of coil to the spider or does the coil just pushed down where it won't go any further into the basket? TIA
@EMFAudio
3 жыл бұрын
The middle of the coil windings go in the middle of the top plate.
@river86012
3 жыл бұрын
@@EMFAudio thank you!!
@danielmoraes9637
6 жыл бұрын
thanks for the vídeo, have a brand of woofer in brazil that the trail of the copper coil brakes, like a dot,only one turn of the coil, the color is like the original color, what do you think about? is a material problem? thanks in regard
@EMFAudio
6 жыл бұрын
If I understand how you are describing it is probably a material problem.
@danielmoraes9637
6 жыл бұрын
thanks! i shared a photo in google photo for you photos.app.goo.gl/0cyB3dsNP4tgwlJu2
@EMFAudio
6 жыл бұрын
That looks like it was near it's power limits and found a weak spot in the wire.
@danielmoraes9637
6 жыл бұрын
thanks for the attention my friend!
@MadDragon75
4 жыл бұрын
I need to pull my EVL from its enclosure. I've been running this 12 on that 1000.1 for a few months now and it started making a coil noise and the clip light flashes bright red at bass peaks. I don't understand. I've been monitoring the heat with an inferred thermometer and 150° occasionally is the hottest it ever got. 😐... Oh boy!
@EMFAudio
4 жыл бұрын
All of that makes sense.
@jeroenschuuring6060
4 жыл бұрын
Really. So how do the coils only rub on one end? Have you got any logica explanation for that except for the coil hanging down? What does this have to do with clipping, please explain. There's logic and there's logic, Just trying to learn here.
@EMFAudio
4 жыл бұрын
How do you mean rubbing on one end? As in top vs bottom or side vs side? Rubbing has nothing to do with clipping.
@IndAudio
5 жыл бұрын
Which company is chinese coil manufacturing?
@davidperry4013
4 жыл бұрын
Show me one that is defective but not abused
@EMFAudio
4 жыл бұрын
That's basically possible. SOMETHING causes it to fail, so short of a solder joint or bad glue it won't fail any other way. A solder joint would be under the dustcap and I've never seen one just fall apart from glue that wasn't sticky.
@SchClean
4 жыл бұрын
Great video.. Very informative. What does colirub sound like? Would it cause metal fragments to be in the speaker box? I recently blew one Sub. Had More power than it can handle .I'm curious what the coil looks like. I will be my 1st time
@EMFAudio
4 жыл бұрын
It sounds like a light grinding. There is no scenario where you should have metal fragments in the box. If it's from the coil, it had a hole blown through it. Even then it shouldn't be very big pieces.
@SchClean
4 жыл бұрын
The speaker was frozen in place. I push it all the way down to look at the coil. As I was moving around I saw a piece of the coil that was definitely scratched about 2" exposing bare copper. There is also what looks like a coating of metal dust inside the magnet hole
@SchClean
4 жыл бұрын
They were not big pieces. They were silver in color and I know they weren't there when I put this sub in. 600 rms running and 800-900
@christopherparis6841
4 жыл бұрын
Does the thickness of the wire indicate power handling?
@EMFAudio
4 жыл бұрын
To some degree it can have some effect, but only in the sense of low impedance because of current.
@terik555
Жыл бұрын
what are the best coils?
@jesse75
8 ай бұрын
JBL flat wire, not round wire.
@jefffalk8484
5 жыл бұрын
How would you describe an unwound coil that is 95% still copper colored?
@EMFAudio
5 жыл бұрын
I bet I can guess the manufacturer of the sub! That's a poorly constructed coil, the adhesive used isn't sufficient for the temperatures.
@jefffalk8484
5 жыл бұрын
@@EMFAudio Unfortunately, not covered by warranty. I overpowered it but the gain was tuned with a DD-1. 1500 rms rating on the sub. Dual 1 coils wired to 2 ohm and amp is good for about 2200 rms @ 2. Had the 12s wired to 1 amp at 1 ohm previously for a little over a year. No issues. Voltage was over 13v, played for under 10 minutes (not continuously) and blew smoke. Shut it off immediately, didn't want to risk shorting out the amp. Probably not worth mentioning an actual brand name here... But I can say their one line of amps are known for overheating..... Smh. Do you offer recones?
@EMFAudio
5 жыл бұрын
@@jefffalk8484 In reality you probably had rated power or less. Not knowing what model sub it is I couldn't tell you if I could recone it but anything that isn't ours I can't build a recone for unless it's in front of me.
@ganon420
5 жыл бұрын
What is better the copper or aluminum coils? I know the copper should be better just based on the amps and heat it can take. But maybe there is something I am over looking with the aluminum coils.
@EMFAudio
5 жыл бұрын
Both have their place in design. Our Lowballer and Banhammer line use copper coils, the YOLO and Ermagerd line use aluminum coils. There are benefits and drawbacks of both that can be used for advantages in design.
@ganon420
5 жыл бұрын
@@EMFAudio Thanks for the fast reply but could you give a little detail on the benefit and drawbacks? Sorry to ask so much. I just find it all very interesting in the design choices.
@EMFAudio
5 жыл бұрын
@@ganon420 That is literally an entire Tech Stuff Tuesday video I have planned.
@frankrivera9083
5 жыл бұрын
DO YOU GUYS STILL MAKE THE EMF AUDIO ERMAGERD'S WITH THE MAGNET SLUGS OR JUST THE SQUARE MOTORS I LOVE BOTH OF THEM AND I'M SORRY IF YOU SAID SO ALREADY BUT COULD YOU PLEASE LET ME KNOW THE PRICE OF THE MOTOR WITH THE MAGNETS AND THE SQUARE MOTORS ALSO THANK YOU FOR YOUR TIME.
@EMFAudio
5 жыл бұрын
We haven't made the v1 in 4-5 years, the v2 we aren't producing right now but may again in the future.
@jason4547
5 жыл бұрын
Is it the voice coils conductivity that sets an individual speakers impedance from the factory ?
@EMFAudio
5 жыл бұрын
Yes, the coil determines the impedance 100% of the time.
@jason4547
5 жыл бұрын
@@EMFAudio Ty... I finally found someone who's smart enough to answer that question for me.
@EMFAudio
5 жыл бұрын
@@jason4547 If you ever get the opportunity, you can see it for yourself by checking impedance of a coil that isn't installed in a speaker.
@audioelectronics542
4 жыл бұрын
can you tell me what is the size of wire used in these voice coils.Please
@slantedperspective
3 жыл бұрын
18 to 24 to 28 he said
@alcidehachey7910
3 жыл бұрын
Can you fix a pioneer hpm 150 woofer with voice coil damage can you fix the coil it self or does it have to be replaced
@EMFAudio
3 жыл бұрын
All the soft parts have to be replaced.
@kevincharles1983
2 жыл бұрын
Man ive had a different setups in my days and never smoked a coil. Also have never used any kind of meter what so ever. Common sense goes a long way. My subs are 750rms each and I push about 900 on them. Set my gain by ear but never over do it. A lot of people don't take time to get informed about car audio and crank the gain and the bass boost. Watch one video on KZitem and you'll know not to even touch that bass boost. Lol. My volume never goes over 32
@Contact_Info
Жыл бұрын
What does it mean when you push on a sub and it starts playing? I did that twice and then it died...is that the tinsel lead soldering?
@bobinasdeparlantes..6001
3 жыл бұрын
friend, what is the name of that black glue with which they make those coils.?
@EMFAudio
3 жыл бұрын
Epoxy?
@bobinasdeparlantes..6001
3 жыл бұрын
@@EMFAudio What kind of epoxy I have already tried several and nothing. I recently bought the hernon but still haven't used it. Please can you help me with that information, thank you ..
@MrRevocutus
5 жыл бұрын
Hi, very nice. For the advice which wire material is more better for voice coil ( pure copper vs CCAW)?. Thank you please reply
@EMFAudio
5 жыл бұрын
"better" is relative. Both have their place in design.
@MrRevocutus
5 жыл бұрын
for Bass speaker (Sub-woofer)
@EMFAudio
5 жыл бұрын
@@MrRevocutus Like I said, they both have their place in design. Generally speaking, once you get into larger coils, being pure copper can have big side effects that aren't desirable because of the mass of the coil.
@Spock-g6d
5 жыл бұрын
Thanks very much, this was very helpful! 👍🏾
@tonystylez8699
6 жыл бұрын
I'm in the process of upgrading to a 5000 watt system what amp would best for 2 12 inch banhammers?
@EMFAudio
6 жыл бұрын
The SCV-4000d is a good match www.emfcaraudio.com/sundown-audio-scv-4000d/
@angelpena700
6 жыл бұрын
Team CT sounds 4K
@EMFAudio
6 жыл бұрын
Angel Pena He said 5,000 watts, and best.
@AllaboutTheWoodrows
4 жыл бұрын
What’s your price on fixing a 13w7 was told $200 locally
@EMFAudio
4 жыл бұрын
I won't touch any W7's.
@AllaboutTheWoodrows
4 жыл бұрын
EMF Audio why is that jus curious and hey is what it is
@EMFAudio
4 жыл бұрын
@@AllaboutTheWoodrows They're very time consuming to do, a total pain, in addition to a lack of parts availability.
@AllaboutTheWoodrows
4 жыл бұрын
EMF Audio I feel you I’m more of a don’t care for original ect plus I’ve been curious how different one sounds on say dual 2ohms or dual 4 instead of the dual 1.5s just one them things I’ve been pondering since I got stuck with a burn coil in a sub my amp wasn’t hooked up when I bought it and it didn’t seem like it had issues everything checked fine but even though I know it can get fixed I’ve just been curious how different things would be. Switching the ohms like that
@EMFAudio
4 жыл бұрын
@@AllaboutTheWoodrows The thing is, you don't really have coil options without winding a custom coil (and even then limited) because of how the motor is. You also have to use their soft parts unless you change the basket. If you change the basket, it has to be very specific because you have to drill out a new pattern in it.
@JuanGabriel-nz9rq
3 жыл бұрын
So what's a good american amp
@EMFAudio
3 жыл бұрын
Amps aren't made in USA anymore.
@vincentrobinette1507
5 жыл бұрын
I don't think wattage is as relevant as current to heating a voice coil. If you take the current, times it by itself, then multiply by the DC resistance of the coil, that tells you how many watts of heat is being dissipated by the coil. Wattage is the product of current and voltage. If you see voltage, that means the coil is moving. Cone excursion is what Cools the coil. If the crossover is set to too high a frequency, it's possible to pass a lot of current through the coil, without the excursion to pump air through the air gap, using the dust cap like a piston. Clipping puts high frequency harmonics through the coil, creating current spikes, without extra excursion, and that's the only way I can see clipping causing damage from an amplifier who's peak rating is less than the RMS rating of that coil. I would NEVER recommend running a speaker driver without a dust cap, because the coil would get no forced air cooling.
@EMFAudio
5 жыл бұрын
Every wonder why electric heaters are often measured in watts?
@vincentrobinette1507
5 жыл бұрын
@@EMFAudio Electric heaters are a pure resistance. VA equals watts, Impedance equals resistance. Throw in a little inductance, and a whole lot of (dare I say it?) EMF, and it's a whole new ball game. This is a motor, being accelerated, stopped, put in reverse, accelerated, then put back in forward, repeatedly. Granted, a speaker is a linear solenoid reciprocating motor coupled to a mass, with some pressure head, but, it's a motor none the less. Proper acoustic loading can give some of the momentum of the cone a place to go, so the amplifier doesn't have to apply "dynamic braking" to slow it back down. One of the hardest things on an analogue amplifier, is having to stop the cone, because you're adding the voltage of the power supply to the EMF of the coil moving through the magnetic field, then multiplying it by the current. Every bit of that wattage is dissipated by the transistors. A properly loaded driver is MUCH easier on a linear amp, than running a speaker in free air.
@EMFAudio
5 жыл бұрын
@@vincentrobinette1507 I think you've missed the point of what I said. Electric heaters are pure resistance, if the coil was moving in a magnetic gap it would then be a motor. If you stop it from moving it will act specifically like a heater. Wattage does matter, the more wattage you put in the more cooling you have to have to stay within acceptable heat limitations.
@vincentrobinette1507
5 жыл бұрын
@@EMFAudio I agree. Stopping all motion lowers the impedance of the speaker, to just the DC resistance of the coil. At low frequencies, the inductance of the coil only adds negligible impedance. The ONLY thing that heats a coil, is amperage times the voltage drop across its DC resistance. If the coil is allowed to move through the magnetic field, it will allow a voltage rise, but that voltage is going into work, radiating out as acoustic energy. That does NOT contribute to heat in the coil, even though the extra voltage, times the current equals more wattage. The worst case scenario, would be accidentally connecting one of the coils out of polarity with the other. The magnetic fields cancel, no sound whatsoever, total cancellation of inductance. At that point, the coil is just a resistor. With no motion pumping air through the coil gap, the coil can't dissipate heat, and smoke is on the way.
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