The 360 slideshot was fantastic. I sure hope they appreciated the visual interpretation of pressure waves interacting with each other over time.
@LitoGeorge
4 жыл бұрын
Agreed. @Hexibase this was terrifically shot and edited. Pro stuff.
@victortitov1740
4 жыл бұрын
Yess!! that was a nice touch, I am still wondering, how did you manage to pull it off!
@Finite-Tuning
3 жыл бұрын
Sure was, in fact, I have to wonder exactly how he did that.
@TheMushmul
4 жыл бұрын
Always delivering nothing less than quality videos and information! Keep it up, HexiBase! Can't wait for the DSP video :)
@delusionwalker8852
3 жыл бұрын
Dude... there are is no other way for me to say it.... I love you! Your channel is pure gold. Very inspiring, clean image, beautiful animation, fluent speech, you know what you are talking about, not too fast not too slow, easy to fallow, simply awesome. What on earth could I ask for more? Well.... that you were my neighbour. 😁
@walterwilliams3861
4 жыл бұрын
U are the most knowledgeable channel that I visit on utube....great vid.
@Wayne_Robinson
4 жыл бұрын
Safety note: protective measures should be taken when working with mineral fibers like rockwool or fiberglass. They're extremely harmful to the respiratory system and more than annoying to get embedded in your skin.
@weareallbeingwatched4602
4 жыл бұрын
Rockwool rash... bad on finger... worse on a lung.
@musicstevecom
4 жыл бұрын
That's why I use Open Foam and Polyester Batting. Also the other stuff can cause Small loose fibers to get into your Speaker drivers and damage them.
@_klent
Жыл бұрын
Peaks and dips in the response can be corrected in the DSP but the ringing is still there. Treating is the best way to fix this problem. Btw, nice presentation.
@CaedenV
4 жыл бұрын
Rock wool is amazing! Recently rehabbed an attic room for my daughter, and part of the room had a seciton cut out where the bathroom/shower is. I bought a pack of rock wool, and threw it in the wall, and also used thicket drywall (not worth it! thick drywall is waaaay to hard to work with), and the noise difference is incredible! I mean, you already have backer board, tile, grout, and drywall, but previously you could hear every drop of watter hitting the floor in there. The slightest hum, and you could hear it in that room. Now with the rock wool, there is a little bit of a running water noise from the pipe in the wall; But that is it! Unless you are singing your heart out, nobody is going to hear anything that is going on in there. Ironically, go to my son's room, which also shares a wall with the same bathroom, but the room part, not the shower, and you can hear everything. His side only has some thin drywall in the bathroom side, and some 70's era 'wood' pannelling, but it is pretty bad. Guess I know what I'll be doing next! Thankfully I already did most of his room, so it wont be the whole room. Pretty much just this one wall... and maybe move a cut-in notch to make a real closet space in there.
@Thomas..Anderson
4 жыл бұрын
It would be nice to see further investigation on the effects of cabinet bracing and constrained layer damping. And also a comparison with plain old industrial grey felt.
@heimdall4148
4 жыл бұрын
That mineral wool is exactly the same stuff as what you can buy in the hardware store to insulate your house with.
@steeezyb
4 жыл бұрын
@@HexiBase I'd wager a guess the difference would be negligable, and most likely not worth the price incurred by having some sort of acoustics stamp. Anyhow, I was excited for this video but I wanted to learn about how different angles effect the frequency graph. I saw an audiophile video with someone touting "defractionless" speakers and I could not find much information surrounding that. Sure it's certainly bogus, but a rectangle prism I'd imagine is hardly near our best option. Please drop some knowledge if you can.
@weareallbeingwatched4602
4 жыл бұрын
@@steeezyb you would be better off searching for "diffraction".
@weareallbeingwatched4602
4 жыл бұрын
Yea man, Rockwool RW3 or RWA45 is standard mass produced insulation stuff. It is designed and rated for acoustic insulation as well as thermal. In the USA a lot of recording studios prefer Owens Corning resin fiberglass panels www.owenscorning.com/insulation/products/type706andtype707seriesfiberglasinsulationboards , because they are less prone to shedding the horrid rockwool dust.
@pandahead9274
4 жыл бұрын
Check out tech ingredients video on diy acoustic panels and absorbing materials
@wishusknight3009
4 жыл бұрын
Regular fiberglass pink is not much different from egg crate insulation. If you manage to find stuff labeled as "Quiet Zone" or some thing like that, it will be superior to regular pink. It is however quite a bit more expensive, usually about twice the price. And it is usually not as good as mineral wool, but is often somewhat cheaper as well. So you have some gradient of trade off vs performance. For my low power system I went with mineral wool after trying many other things. In my situation it was the only thing that worked to my satisfaction. And this is also keeping in mind the room is purpose built.
@Vibration_Crew
4 жыл бұрын
Hmmmm, Rockwool...... itchy stuff, gritty on the teeth if your unlucky enough to breath it in. If your thinking of using this stuff in a high power reflex design/port, cover it in fabric b4 installing (like a pillow) High power drivers can break up the material causing particles to get pushed out of the port and into your room. Covering it with fabric will at least contain any breakup. Spraying the cut ends with hairspray was another trick I've seen.
@RadRidesByCru
4 жыл бұрын
@nate0
@weareallbeingwatched4602
4 жыл бұрын
A lot of the studio absorbers use plastic sheeting in addition to fabric to contain the rockwool. The dust is notorious, and is a significant concern as a panel reaches an age of a few decades. This is one of the reasons why Owens Corning resin-fiberglass panels are popular in the USA.
@Vibration_Crew
4 жыл бұрын
nate0 > Totally agree with you, thought I'd just add the covering part incase some people didn't know.
@wadimek116
19 күн бұрын
Actually your completely wrong at least in EU, they tested the health concerns of breathing around them as workers were installing them in many buildings and results were that no health concers after 5 years.
@CriticalTechReviews
4 жыл бұрын
Super looking forward to the DSP multi channel tutorial. I've been thinking about going digital for a while now.
@rogerdavis2056
Жыл бұрын
I have used carpet foam padding on my subwoofer boxes. And had great results by ear not by computer analysis.
@geebuscripes3764
4 жыл бұрын
Finally a side by side comparison! Thank you that was a great video!
@farbe123
4 жыл бұрын
Your videos are really good learning material! thanks for doing this! Please do a video about room modes and the compensation with 2 subs.
@JesseJames83
4 жыл бұрын
Excellent work as always. Thanks for putting that into a visual package!
@UpgradingAsUsual
4 жыл бұрын
The mineral wool look like it's impressive stuff. A bit like the work you do!
@UpgradingAsUsual
4 жыл бұрын
@@HexiBase Your welcome.......I'm still waiting patiently for that transmission line home theatre sub, man!
@JoeJ-8282
4 жыл бұрын
I am a speaker guy myself, but I am also *extremely* poor money-wise, barely able to (usually) pay my rent on time each month, (NOT rn though, because of the current, Spring 2020 pandemic and no work), so I can ONLY afford to design speakers and subs and other stuff on *paper* and with a calculator, and I can only afford to work with cheap speakers and stuff I find in the thrift stores or used... I really WISH I had all of that "high-tech" gear and measuring equipment that you have there! My GOD, the totally EPIC and *groundbreaking* speaker designs that I could develop, test and build with all of that computer and pro audio stuff is only *imaginable* to me, but I certainly would get my use out of all of that kind of stuff IF I had any access to it! WOW!... I really LOVE watching videos like this about sound and speakers and acoustics because that is MY "nerdy" passion too, you have NO idea! I always enjoy your videos man! I just wish I knew you personally and lived in the same city as you, so I could visit and talk speakers and electronic stuff with you for hours on end!
@ziggy8757
4 жыл бұрын
hope to see lots of videos coming up from you Pete these days, lets have some positive stuff coming up out of this quarentine disaster....we need more content, in a couple of weeks ill be running out of good movies and series...lol
@scorpio6587
4 жыл бұрын
4:31 It would be awesome to see a plot of the light blue curve minus the yellow curve, or perhaps the absolute value of the difference, if the program you are using allows it.
@Mark-rn6rs
4 жыл бұрын
Outstanding Working on 2 sealed 12” right now
@KimOyhus
4 жыл бұрын
A hamster crawled through the bass reflex port of a friends subwoofer, and could not get out again. So he lifted the woofer and shaked it to get the hamster out. That did not work, so he had to dismantle it to get the hamster, which had been shaken around in rock wool. It died a few days later, and his daughters got sad. As for the good sound absorption. I think this is due to rocks higher density, so the fibers resist moving with the sound waves. And there should also be optimal thicknesses of the fibers, matching air diffusion distances at different frequencies.
@TyrKohout
4 жыл бұрын
Your videos have gotten so good in recent history! Great animations, graphics, and presentation style.
@psementalist
4 жыл бұрын
Pete Bravo excellent good video topic of choice for discussion. You are going to educate a lot of people with this video
@malcolmhyde6726
4 жыл бұрын
Great video as always, its our first day on lock down so really appreciate the positive distraction!
@Finite-Tuning
3 жыл бұрын
I use polly-fill myself, I like it's affect better than foam. But I've never measured the before and after, you've definitely got me wondering about that wool stuff though! That's an impressive result for sure.
@schlegs86
4 жыл бұрын
Interesting! I was wondering what your thoughts were on poly-fil stuff! More like when to use vs not to use situations.
@christhopherlasher2828
4 жыл бұрын
I also would have liked to known his thoughts on that since he has not answered you back
@christhopherlasher2828
4 жыл бұрын
Except for he answered it down below in somebody else's comments and I just found
@chrislund8429
4 жыл бұрын
That wool seems identical to what I have uncovered in older GM cars for road noise, and I always tore it out in favor of Dynamat!😆
@weareallbeingwatched4602
4 жыл бұрын
Actually mild steel sheet with dynamat could work as a pretty effective membrane absorber if correctly designed. Possibly with some holes in it, and an airspace behind it.
@ericthedesigner
4 жыл бұрын
HexiBase hits me in the gut, Love your videos!!!
@mariusloubeeka5810
4 жыл бұрын
The great thing about the interesting hobby speaker building is that each detail of it can be a whole science on its own. You can produce different results depending not only on the type of material you use but also on how the material is distributed inside the box. And iif you start to combine different stuffing materials, try several styles of bracing and use separate absorber chambers inside you can experiment for years!
@hoth2112
4 жыл бұрын
Have you ever looked into mass-loading (sand-filled walls, inner walls lined with dynamat between the cabinet & rockwool), or constrained layer damping & its affects on cabinet construction/resonance?
@mattieson130
3 жыл бұрын
Can you please make a tutorial, of how to make correct time alignment messurements, and how to eq properly. there is'nt much info about that. thanks from the netherlands
@CharlesVanNoland
Жыл бұрын
MOAR MINERAL WOOL!!!!!
@anandshah71
4 жыл бұрын
I would love to see a video or series of video on room correction and bass management using miniDSP and mic and rew. Not able to find any online wonder how people missed this is the core. I won’t mind to pay for such a content
@brycelawmaster3746
4 жыл бұрын
how much does using mineral wool change the air volume in the encloser, and how much of the graph change is due to the smaller air volume now?
@smalltimer4370
4 жыл бұрын
I love your work - very thorough and most helpful
@speakerscott
4 жыл бұрын
Quite a few errors in this one: 1. In room measurements are a very poor way to look at enclosure related issues. 2. Enclosure issues need to be separated into two categories....panel resonance, and internal standing waves. 3. The wavelength of 51Hz is 22 feet..your box is roughly 2.5 to 3 feet in it's longest dimension (judging by the table it's sitting beside) There is NO WAY for a standing wave to develop when the the internal size is only 1/10th or so of the supposed frequency. It is *theoretically* possible for the panel to develop a resonance, but that would have to be a very very poorly braced box. And while that box had no sides braced against the opposite sides, the ribbing should provide pretty substantial strength. 4. Two inch rock wool will not provide any significant absorption down that low. Anechoic chambers are build with very large wedges to provide enough wall absorption to minimize any room boundary caused errors....those wedges would have to be 1/4 wavelength thick or more...so roughly 5.5 feet. Enclosure issues are much easier to diagnose through impedance measurements. Either type would show up as a bump in the impedance or a wobble in the phase of the impedance. If you're going to try to diagnose these sorts of issues with response measurements use the ground plane technique.
@weareallbeingwatched4602
4 жыл бұрын
+1 However, it is also important to note that wave propagation within a box a low frequencies is fairly chaotic, and significantly reducing the reflectivity of the surfaces will produce a complex set of changes to the acoustic response. Also many studies of rockwool panels have shown that under some circumstances due they can reach lower than expected from gas-flow impedance models, possibly due to pressures at the boundary causing the fibers to flex. It's something that has been puzzling acousticians for a while, and it's hard to precisely predict what the installation of rockwool panels will do without measuring in real world experiments.
@scotthinson8185
4 жыл бұрын
@@weareallbeingwatched4602 At higher frequencies the impacts can be strong sure...but that's a 30" tall box. The biggest difference in the measurements was at ~50Hz. We're talking 1/10'th of a wavelength, so there's no real wave propagation at that point, but pressurization. I'm well aware of the modeling MJK, Backman and others have done on the impact of stuffing, these results fly right in the face of Backman's most recent stuffing/FEM modeling paper he did while still at Genelec. Basically it's a false premise that that issue can be measured in room, it's a false premise that the fix did anything substantial at those frequencies unless that box is literally a floppy mess (and hot gluing rock wool will not add substantial damping to those walls) and a box that size should never have an issue at 50Hz anyway. If it were 5.5 or 11 feet tall sure...but that box is less than 36" That should have been shown as change in system Q in an impedance measurement and an elimination in any impedance wiggle up higher in frequency. I would estimate (again without knowing the exact enclosure dimension) that it's a vertical internal standing wave that doesn't form until ~225hz or so. Even then he'd have to do a double layer of 2" rockwool since the performance of the stuff starts to drop even with the higher density foam between 250 and 500Hz pretty significantly.
@alvinchow5351
2 жыл бұрын
amazing videography
@MisterKaen
2 жыл бұрын
Thank you
@eamonnosullivan1563
3 жыл бұрын
Love the detail you go into and the pace. Thanks for sharing. What simulation software did you use in the video?
@AldenPez
3 жыл бұрын
Do you subtract the air space taken up by the egg crate foam or mineral wool from your boxes air space?
@FSXgta
Жыл бұрын
In this case it's infinite baffle so the volume is already correct
@andysmith7731
4 жыл бұрын
thanks for my series tune dual bass reflex enclosure. From AZ
@dannyhoang3192
2 жыл бұрын
This video is very helpfull, bro. Thanks for that
@MrSopuli3
4 жыл бұрын
There are mineral wool knives for cutting that stuff that are cheaper than the electric and work great
@bluerads577
4 жыл бұрын
You should try the fxtreme DB450 DSP amp! it is wayy better then any other amp boards, and it has literally everything already build in, bluetooth, DSP, 4 channels (2 channels bridged) and even a freakin step up booster! so basically a AIO lol.... i already bought it a few weeks ago and it really is the best amp money can buy
@proffessasvids
4 жыл бұрын
Superb vid Pete! Xx
@3rdaxis649
3 жыл бұрын
They sell that same insulation at my Home Depot. And a regular serrated bread knife cuts if perfectly.
@tp7886
4 жыл бұрын
I like the results shown in the video but I would have preferred a deeper look at what enclosure resonances actually are and where they stem from. You almost started to dig deep with the look at pressure response inside of an enclosure but just kinda left it hanging there. The thumbnail had me thinking you were going to talk about the effect (or lack there of) of adding 45 degree corners. Talking about bracing enclosure panels would fit nicely in a longer more in depth video about enclosure/panel resonances. The effect of a double baffle vs dowel vs I-beam style bracing would be fantastic. Keep up the great work!
@Cashlack
4 жыл бұрын
excellent quality, both from informative and production point of view.
@weareallbeingwatched4602
4 жыл бұрын
The difficulty of mapping semi-conductive elements within an enclosure is the reason why the aperiodic enclosure design was omitted from the original thiele & small papers on parametric modelling of enclosures. In all honesty that rockwool isn't thick enough to really influence subwoofer frequencies, and if you look at many of the commercial sealed cabinet designs from pro audio, it is typical to fully-fill the cabinet with polyester wadding in order to achieve a relevant level of resonance damping. I would expect that a box entirely filled with rockwool would be quite successful in reducing resonances, but might be difficult to model. Have a look at this BBC research paper on the subject of wideband rockwool absorbers for reference: www.bbc.co.uk/rd/publications/rdreport_1992_11 Also for reference note that low frequency absorption is not generally achieved using rockwool panels, but instead by using perforated membranes: www.bbc.co.uk/rd/publications/rdreport_1971_15 There is a lot to be said for solving the problems of speaker cabinets using the same acoustics toolbox and materials palette as is used for an architectural scale space, although the general assumption has been that speaker cabinets and smaller rooms do not have the required volumes required for the absorption of low frequencies using foam/mineral wool.
@Jean-Triphase
4 жыл бұрын
I agree with you, the wavelenght of low frequency are to long to trying to damping it with any absorbers materials, the most important in cabinet for low frequency driver is eigenmodes of the cabinet himself. Some commercial brands just put absorbers in there subwoofer to make it look great when customers look inside, but most of the time it's totaly pointless. It need several meters of foam absorber to start damping 50Hz who has 6.86 meters wavelenght. Sorry for my English :D Just a thought: Maybe the mineral wool dont absorved this 50Hz resonance, it slow down the air in the cabinet at a specific location and calm down a cabinet eigenmode around 50Hz. if it really absorved the 50Hz resonance so why it didnt absorved the 80Hz resonance and all the little dips after 100Hz which got a shorter wavelenght, in theory it's easyer to absorve a shorter wavelenght. just a thought btw.
@weareallbeingwatched4602
4 жыл бұрын
@@Jean-Triphase well, suffice to say that almost all decent quality PA cabinets have fairly thick lagging inside them - usually wool felt of some sort. The dynamics of the system and how it pressurises and depressurises - and also how wave fronts propagate within the cabinet - the general assumption is that supplying enough dampening material at the boundary thus removing the ability of the cabinet's internal resonances to result from unwanted reflections and standing waves / comb filtering is appropriate. For a subwoofer the effects are going to be negligible, whereas building a 4ft deep box/tube entirely filled with rockwool very likely would produce a totally different but hard to model enclosure. This would allow both the exploration of the more detailed sorts of analysis of exactly what rockwool does, and also would very likely produce a resonance-free and back-wave free enclosure which might outperform a sealed cabinet in terms of frequency response if not efficiency. One question is... what is the speed of sound in rockwool?
@Jean-Triphase
4 жыл бұрын
Yes PA Speaker or even Hifi, Pro monitoring for the absorve >500Hz. Braces is used for control 500Hz. I still maintains Wool is nearly pointless for absorbing frequency resonance inside a subwoofer cabinet.
@weareallbeingwatched4602
4 жыл бұрын
@@Jean-Triphase well, regarding frequencies, depends on the size of the box, really. The problem is that if you over-fill a cabinet, you start changing the speed of sound. That is the "secret sauce" and patented method in PMC's transmission lines.
@MasterDJRenn
4 жыл бұрын
Always a 👍.
@goodgoat3096
2 жыл бұрын
I am curious about how denim house insulation would compare, or the very expensive stuff that GR-Research sells. Love the videos.
@thomasschafer7268
Жыл бұрын
Total überteuert. Wie Bondum800 in Deutschland
@qbert008
4 жыл бұрын
I'd recommend using a cheap machete from harbor freight, just make sure to keep it sharp. It'll slice through the stuff from orange or blue cleanly and with minimum effort. I've been stuffing the walls of my house with the stuff mostly from blue, it's slightly thicker and denser, but I never considered using it in a speaker box. I have a project coming that it may be useful in. Thanks for the tip!
@johnviera3884
2 жыл бұрын
Please do a video on the DSP devices by Audio Dynamics.
@henrysebok8796
4 жыл бұрын
Hey, great video. How did you simulate the air movement?
@wizardgaming5738
4 жыл бұрын
I'd like to know as well!!
@henrysebok8796
4 жыл бұрын
@@HexiBase I've seen other videos of yours with calculated frequency responses for all types of enclosures. I use WinISD and only have a few options for enclosures. How would you calculate more advanced responses?
@xaytana
4 жыл бұрын
Do you have any videos on box geometry, as in what the optimal solid would be? Such as a cube vs. a sphere, maybe even comparisons with some other solids such as the other platonics, or the more easier to construct archimedian and catalan solids; I'm also somewhat curious about how a toroidal enclosure would theoretically work. I know this would only really be demonstrated with air velocity/pressure simulations, as there's no real way to make a truly spherical enclosure easily, and finding a way to glue together a large solid that isn't a cube could be fairly difficult. I'm just more curious as to how deviation from 90 degree corners would affect output; say, would a tetrahedron be better or worse, or would an octahedron be better or worse, then so on until we get to something that's too difficult to manufacture, like high face count solids and spheres.
@1rexrex
4 жыл бұрын
Pretty cool. I could definitely hear the difference through my woofer.
@rikardekvall3433
4 жыл бұрын
Great video! At 2.37 you use a spray gun. Is it glue to mount the boards in the cabinet or a varnish that will bind the stone fibers in the Rockwool board? Dust can damage the speaker coil. Know that Rockwool has boards that have a cloth on one side to stop the dust in the board. Take a look at their acoustic range, next time. Rockfon is the brand. There, the boards are covered on one side of canvas or acoustic paint.
@badsob83
4 жыл бұрын
Are you calculating the sectional density and volume of the dampening material for wave reverb delay /phase delay to impact resonance vs just using a more efficient enclosure ?
@2869may
3 жыл бұрын
Yes, it absolutely changed the volume of the enclosure a fair amount.
@chinmeysway
Жыл бұрын
so then what about 90 degree angles mentioned in thumbnail
@sudd3660
4 жыл бұрын
i thought that filling a sealed box was the way to go, there are special sealed box damping material for that.
@braddsouza4
4 жыл бұрын
Can you make a video on modeling enclosures for a room
@pedrova8058
2 жыл бұрын
foam, rockwool or any other similar stuff dont´t have any important effect on bass region, under 200Hz fibers do not absorb or dissipate nothing. When you need to absorb or dissipate energy in that frequency range, vibrating panels are used in conjunction with some absorption (membrane resonator), or bass traps that depend on the dimensions of the wavelength (1/4 lambda) or helmholtz resonators. Foam or other similar stuff inside box absorb only the highest resonance internal modes. The effective response on bass depends on box dimensions (due to refraction, 100-400hz) or on main modes of the room. Below 100Hz, in a normal room (without very deep bass traps, or any treatment in that region), the frecuency response is heavily influenced by the resonant modes of the room. And the equalization does not have much effect, because once these resonance modes are activated in the room, they are "hung", ringing for a while once the sound source stops emitting. Waterfall plots are very helpful to see what happens in the room on extreme bass
@ASSOpid
4 жыл бұрын
That mineral wool reminds me of the USD Audio AP mats form back in the day.
@HPMIKE55
3 жыл бұрын
@HexiBase great job bro! & my box is like the 74 litter but it is powered and has a rectangular vent that I don't know if I should close or leave open? I just watche movies if that helps. lol
@robertthompson578
3 жыл бұрын
Is the enclosure made with mdf if so I used to install car audio for 15 years. Mdf is pourers meaning it’s compressed wood that air can still penetrate the material. When I design a box I fibre glass the inside and then paint the inside with bitchinum paint which builders use on the roof. Then apply the sound proof . Amazing results. I’ll send you pictures of my installation which I’m doing to my van
@chriswhite4596
4 жыл бұрын
Awesome video Brother !!!!!
@subStuff
4 жыл бұрын
superb video!
@loudsonicbug2195
3 жыл бұрын
imma just slap old clothes and towels in my sub. works fine.
@johnsimun6533
3 жыл бұрын
If you put a mesh separator in the middle. Then put an hinged lid on the top. Make sure to install a air tight gasket, along with a latch strong enough to keep it sealed. You then have a (can’t combine the words together to make sense) laundry basket/subwoofer.
@cameronshapley7454
4 жыл бұрын
Can you do a dedicated video on the bass reflex band pass box, the one where it ports into another chamber I would really like to build one but can’t find any more information on it besides the uncommon box video you made
@Juanro_7
2 жыл бұрын
What about changing the geometry of the box?
@dwightcarter6334
4 жыл бұрын
Although not as easy as foam or insulation have you done any testing with angled corner bracing to kill the corner waves?
@pabloosvaldopenizzotto1098
3 ай бұрын
Have you ever completely filled the box inside with poly fill or other absorbing/ damping material? What was the results? ..or what your recomendactions about this? Thank you!
@technomaker777
Жыл бұрын
Hello! Tell more about modeling response of speaker and enclosure PLEASE! How dou you predict it?? What software do you use?
@SmalltimR
4 жыл бұрын
Awesome - love your work!
@workingclassperson2124
4 жыл бұрын
That was great. Think I’ll give that stuff a shot!
@elektrocat8681
3 жыл бұрын
What software do you use to simulate the enclosures. Great work 👍
@ZeroG84
4 жыл бұрын
If sound quality and subwoofers alone would get human kind to Mars... This guy would have made a team of scientists and would have already came back.
@anglerandy5736
3 жыл бұрын
Can I do a push pull isobaric with a front facing subwoofer and a down firing subwoofer firing into the enclosure from the top at a 90 degree angle from front subwoofer?
@JulianKrause
4 жыл бұрын
Very interesting! Does the mineral wool lower the sensitivity of the subwoofer?
@JulianKrause
4 жыл бұрын
@@HexiBase Thank you for the quick reply and all the knowledge that you share! 👍
@ocr96
4 жыл бұрын
I noticed there is also a "sound dampening" mineral wool out for between walls. Might be worth the extra cost.
@michaelpiotrowicz6100
4 жыл бұрын
Sound insulation is not necessarily a good sound absorber. Concrete is an example of the former only. In a speaker box you want something soft enough to deform at the relevant frequencies and SPL to re-release the energy slowly. I would guess that rockwool suffers the same problem as foam. Too firm. With polyester the apparent volume of the box can even be increased.
@weareallbeingwatched4602
4 жыл бұрын
@@michaelpiotrowicz6100 I think you would do well to do some reading on the speculation about how exactly rockwool is absorbing sound. It is primarily gas flow impedance (also termed air flow resistivity), but also relies on qualities such as tortuosity and porosity (coupled flow nightmare). It is not a simple matter. Rockwool works, of that much we are sure, and most of its effects can be modelled simply by its ability to impede gas flow. Here is some surface to start scratching: resource.isvr.soton.ac.uk/staff/pubs/pubs47.htm the paper by fahy and Thomson on the coupling of perforated/porous solid surfaces to air is worth a read.
@michaelpiotrowicz6100
4 жыл бұрын
@@weareallbeingwatched4602 thanks for that. Some experimental literature that you might find interesting, and which is consistent with my experience, is available to read here sound-au.com/articles/boxstuff.htm
@ThePiraguista
3 жыл бұрын
How much the volume the insulations occupies inside the box? would be interesting to test the same real volume in an enclosure bigger enough to compensate the 2in thinckness of the rockwool
@johnviera3884
2 жыл бұрын
So you’re telling me that filling up that space with all that wool does not affect the volume of the box?
@46HarvesterOfSorrow
3 жыл бұрын
What about the common poly fill? If planning for the wool, does it eat up some air space? In other words, build a little bit bigger enclosure to get your net volume after the wool? I usually do minimum 1" walls with overkill bracing. Then loosely fill with poly.
@tianjohan4633
3 жыл бұрын
What if you change the internal shape? If you stick to the same size cabinet, what happens if there are no parallell walls? If you curve the rear wall, and the side wall? Or any other shape you might fancy that might help sound wave reflection? For years I've been having this in the back of my head without finding the time to test it out, and also I don't have any test equipment or skills how to use such tools, so I would have to rely on my ears and only them, and I am not sure they are good enough to hear any difference. Have you ever tested this out in real life?
@rmksledhead63
4 жыл бұрын
Isn't a sphere the most 'ideal' shape for an enclosure? Could be done easily in a 3d printed design.
@sniper8567
3 жыл бұрын
How can the mineral wool in that small box affect 18Hz. Something is wrong. Think you are using more smoothing on that last curve.
@rapdfyr1
4 жыл бұрын
I always enjoy your content. Luckily most of the car audio enclosures I built (1980's to current, LOL)had at least 1 angled back wall or speaker face. I did experiment with different methods to reduce standing back waves back then. I had a enclosure design I was gifted in the early 90's that I can only remember a few details about. I'd like to see if you can help me identify what it was. Keep the videos coming.
@st170ish
4 жыл бұрын
So what box design considerations should we take when designing a LF enclosure to avoid these issues?
@AJ-wb2dp
4 жыл бұрын
At time approx 1:25 you show cabinet internal pressure simulations-what software is being used here? Assume more "price friendly" than Comsol?.... Cheers.
@jwtiiicnt
4 жыл бұрын
So when you add the dense mineral wool the box volume is reduced. This test compared to the volume of the empty box would not be the same test correct?
@alexlittig2897
3 жыл бұрын
@Hexibase just wondering if you have ever dabbled with some Isometric Pressure Speaker drivers? Vifa makes some good ones. I have the Vifa Helsinki and its one of the best sounding Bluetooth speakers i have ever listened to. I bet you you could create a kick ass Isometric Pressure Speaker set up with your vast sound knowledge.
@fornarnia8
4 жыл бұрын
Still don't quite get why too much sound processing sounds unnatural? Maybe you could do a video on it?
@carlos2004
4 жыл бұрын
i think it mostly refers to trying to fix the natural destructive nodes through dsp instead of actually fixing the room/speaker positions/speaker cabs. if the problem is severe, you're just going to be adding a lot of distortion because the amp will clip first at those huge spikes, and the speaker will distort since it is still working harder, but it will be naturally muted due to the destructive node cancellations. i personally have this problem, (at around 120hz for me) and my audio suffers because of it, mainly classical music which has huge dynamic range (and imo, unnecessary). i'm not a perfectionist, and because it works well enough as it is, i haven't bothered fixing it.
@kabevis1
2 жыл бұрын
Love your video. Question for you HexiBass - with sealed enclosures, would filling it airspace with hexafluoride gas help it sound deeper?
@crazyasspotter
4 жыл бұрын
What about stuffing the enclosure with Polyfill? I was taught by an old schooler that it has the same effect as what is shown here.
@jonjonr6
4 жыл бұрын
Onw thing I uaed to do is build the enclosure larger than needed, then overstuff with polyfill. The bass did sound different. But I never had the equipment to really measure it. I hesitate to say the bass sounded deeper. More like, the bass sounded less like it came from a box. Additionally, I avoid building slim boxes.
@weareallbeingwatched4602
4 жыл бұрын
@@HexiBase Depends how much you stuff, and a surprising amount of polyfill can be added to a box, to the point of significantly decreasing its effective volume, although fundamentally polyester is a lower mass material than fiberglass or mineral wool. There are also various stocks of felt and foam chippings which have been used to fill sealed speaker cabinets.
@crazyasspotter
4 жыл бұрын
Could we be seeing a test with Polyfill in the future?
@mrchrisk36
4 жыл бұрын
I ordered a mini dsp c6×12 for my car but I now need to buy a Windows 10 laptop to be able to use it lol! Look forward to any videos on using the minidsp products and tuning
@richardperry3020
3 жыл бұрын
What effects do sound deadening with the likes of dynomat make?
@quinxx12
2 жыл бұрын
Hey, your videos are already quite advanced. Are there any good resources you would recommend if one wants to start with speaker building?
@JaMarvelousjmar
4 жыл бұрын
Would adding 45s in the corners help?
@derekhoffman9737
4 жыл бұрын
Out of curiosity, what would the response be on an enclosure like this if you added a small port to it with the mineral wool? Also how would a rounded enclosure effect the sound and response of the sub? Meaning the inside of the enclosure being egg shaped.
@spuds7677
3 жыл бұрын
Was it worth the time and money to switch to the Mineral Wool? To me there was little effect between the different insulation types. It may change the graph some but can you actually hear the changes?
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