I have a pair of Technics SB-X500s and the voice coil burnt out in the of one of the tweeters (copper is black, wires are burnt and disconnected). The replacement part is nearly impossible to find, and the design of these speakers is pretty funky so I was wondering how you guys would choose a replacement tweeter.
Replacement Tweeter for Technics SB-X500A
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gdmoore28
Super Member
Wow, I've never seen those. If you could post pics of your tweeters innards with their specific diameters and the resistance value of the good one (check it with an multi meter set to measure ohms, with the tweeter unhooked from the crossover), we could recommend a replacement substitute.
GeeDeeEmm
GeeDeeEmm
Would also be good to know the overall SPL rating of the speaker (in db) so a tweeter with similar sensitivity can be selected. The crossover points would be nice, to estimate frequency range required, but probably really hard to find those listed anywhere. Also if there are any resistors in the tweeter circuit.
I took some pictures of the broken tweeter, and my multimeter ratings of the working one (which fluctuated between 7.5 and 8ohms)
https://i.imgur.com/puH67kt.jpg
The crossover frequencies are listed on this page. I have no way to measure them, but I trust they are accurate. No idea about the SPL though
https://www.hifiengine.com/manual_library/technics/sb-x500.shtml
https://i.imgur.com/puH67kt.jpg
The crossover frequencies are listed on this page. I have no way to measure them, but I trust they are accurate. No idea about the SPL though
https://www.hifiengine.com/manual_library/technics/sb-x500.shtml
OK, so if NH-Man's doesn't work out:
You need a tweeter that will go down to at least 4000Hz - to be safe, lower than that. But that's usually not a problem with most tweeters. It will be much more difficult to find a physical fit. That's because of the weird 2 screw mounting. Something with 4 mounting holes could work if they are spaced right. So get the distance between those screw holes on the old tweeter.
I assume you'd want to install that trim piece on the front so it looks the same. So you need something that does not stick up too high. A dome tweeter will work here since it's got a small dome in the center that will fit in the center window of the trim piece, rather than a cone that will extend far beyond it. But you have to make sure the dome doesn't hit the trim piece. Parts Express will show dimensions on their dome tweeters.
Sensitivity is 90 db. So you probably want a tweeter somewhere in that range. It has a tweeter level control so that's good - it will allow you to dial in the level for a slightly different tweeter.
You need a tweeter that will go down to at least 4000Hz - to be safe, lower than that. But that's usually not a problem with most tweeters. It will be much more difficult to find a physical fit. That's because of the weird 2 screw mounting. Something with 4 mounting holes could work if they are spaced right. So get the distance between those screw holes on the old tweeter.
I assume you'd want to install that trim piece on the front so it looks the same. So you need something that does not stick up too high. A dome tweeter will work here since it's got a small dome in the center that will fit in the center window of the trim piece, rather than a cone that will extend far beyond it. But you have to make sure the dome doesn't hit the trim piece. Parts Express will show dimensions on their dome tweeters.
Sensitivity is 90 db. So you probably want a tweeter somewhere in that range. It has a tweeter level control so that's good - it will allow you to dial in the level for a slightly different tweeter.
This page will let you sort by impedance (8 ohms for you) and various other parameters.
https://www.parts-express.com/cat/tweeters/17
https://www.parts-express.com/cat/tweeters/17