Great video! - I just picked up a PA speaker and one of the tweeters isn't working. It's very similar to the one you have except it has a small metal disc inside that's come de-soldered. If I use my thumb to bridge the gap it completes the circuit as I must have the right amount of resistance in my thumb. Going to try a 47ohm resister as you mentioned and see if I have any luck with that!
@MickeyMishra
4 жыл бұрын
They really do sound better with a crossover. The newish Cheap dome tweeters now use a piezo element and they sound rather very good when filled in with a nice mid-range. Even though they still sound like those cheap tweeters without equalization, they now sound at least musical as some of the old Moto unit designs like the Dalhquaist. Its weird, on paper you think they should sound great. Need no Crossover, and no kind of network. But in the real world where sound is more of an art. Its and art to make these girls shine.
@redrumck81
6 ай бұрын
this is the exact speaker i have and i need to replace both speakers. where did you find the replacement? or are they all pretty much the same?
@djijspeakerguy4628
10 ай бұрын
These are the correctly designed piezoelectric HF units with the cone glued to the center. Unfortunately, the home audio industry saw some pretty horrific implementations of piezo discs starting in the 1980s and continuing into the 2000s. It’s usually piezo units glued to plastic domes from the sides of the piezo disc, and often even glued into the enclosure with thick wood glue! There was even just a speaker with a tiny piezo disc glued into a little cavity, and one with a piezo on a thin piece of cork! In all of these cases, you have to disconnect the woofer and mid, and put your ear right up to the piezo to actually hear anything from it!!! The main companies that I saw doing this the most are Aiwa, Sony, Kenwood, and others in that sort of market at the time. The midrange speakers in those designs were actually perfectly capable tweeters, so it wasn’t all bad. And the 2-way designs with these piezo tweeters usually had perfectly capable full-range speakers that could’ve worked without the piezo. (One of these even claimed to be a “2 way” speaker.) I think the piezo was more of an aesthetic gimmick, or a way to advertise their single driver speakers as 2 ways in those days, often both.
@nopochoclos
9 ай бұрын
Gotcha i am restoring a great Aiwa Nsx-D9 a mini Hiffi system with separated modules include a Dat, i am only amateur but i cant hear the Tweeter i think i am in my 46yo i think maybe can´t hear the freq, or is damaged i open the speaker and has a Dome tweater and test with the multimeter and nothing.. both speakers i search a similar on Argentina and nothing, is so tiny dome ..3cm, i retire the dome to see if i can repair the coil ( is a metal cased tweeter) and for my surprice inside haces a piezo like that you said!!! outstanding , thanks for the info too. I can replace the piezo with dome tweeter or affect the crossover?
@djijspeakerguy4628
9 ай бұрын
@@nopochoclos The NSX-D9 appears to be an older Aiwa system, likely dating back to around 1990. I have an SX-810 speaker from a similar time, and it is one of the speakers that has a poorly implemented piezoelectric tweeter. It does nothing to improve the sound quality, and if it wasn’t there, you wouldn’t notice any difference. I disconnected my midrange speaker and put my ear directly on the piezo tweeter. I could barely hear it at a really high volume, and I’m only 18 so my hearing is probably not very bad. That speaker likely has a piezoelectric disc glued to a metal dome, but since the dome is connected to the disc around the outer edge, it’s never going to make much sound. You have to have a very small rigid contact point in the center of the disc to get any sort of usable sound from a piezo disc.
@djijspeakerguy4628
9 ай бұрын
@@nopochoclos Also, I would not recommend replacing the piezo with a normal dynamic tweeter. At least in my speaker, the piezo is wired in parallel with the mid/tweeter driver below it. If you put a normal tweeter in place of the piezo, the ohms will not be correct. Also, that “midrange” speaker is also working as a tweeter, so you will essentially be running two mismatched tweeters. This could cause phasing issues which could actually make treble clarity worse than it already is. I would personally keep the speakers exactly how they were designed.
@nopochoclos
9 ай бұрын
@@djijspeakerguy4628 Yes when i open it ( sorry for my brute english) i found the glue to the dome dryed and cracked so, is no more in contact to the dome thats why too i can´t hear it.. i will try to upgrade with other real dome tweeter .
@nopochoclos
9 ай бұрын
@@djijspeakerguy4628 Very nice information is good to learn in this way, maybe put a cheap piezo like these 4 ohms from car kits.. but im thinking why has 4 ohms, maybe has a resistor inside to match 4 ohms .
@irradianz4720
10 ай бұрын
What is the name of this piezo tweeter? i need a tweeter than has the same type of piezo mounting.
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