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Stax SR-80 troubleshooting

post #1 of 11
12/25/09 at 1:38pm
Thread Starter 
I recently got an SR-80 with an SRD-4, which had been working beautifully until today when I was listening to it and the right driver suddenly went quiet. There's some light crackling as well. When I wiggle the cable entering the baffles it doesn't fix it but it almost seems to be doing something.

Does this sound like something I can fix? I don't know how to dismantle these phones or what I'm actually supposed to look for so any help would be appreciated. I can't quite figure out how the plastic backing is supposed to pop out from looking at the pics in this thread. Hoping it's a loose joint (or something) and not a dead driver. Thanks!

EDIT: Got it open! Should I post a pic? The membrane is taut and there's not really anything that looks weird...
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post #2 of 11
12/25/09 at 3:01pm
Thread Starter 
OK... somehow I fixed the right driver. I was playing around with the volume and it just suddenly jolted back up, now it sounds fine.

Problem is now the left side has a bad joint! I'm not getting any continuity through one of the wires and I don't know where the damage is. Gonna be a pain if it's in the plug cause then I'd need to get a new one.



Any ideas? If I have to make a totally new cable I can probably use a 4 or 5 pin DIN connector right? Does the cable need to be a certain voltage rating?
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post #3 of 11
12/25/09 at 4:58pm
Sounds similar to the problem I have with my SR-40. I never could verify what the problem was. Everything worked fine when I took it apart. There's a kink in the cable in the ear cup that I suspect is the problem. I don't believe there's a voltale requirement for the wire since the bias is already applied to the drivers.

What's the red arrow pointing to? I can't really tell in the picture.
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post #4 of 11
12/25/09 at 5:21pm
Thread Starter 
That's the wire that's not working. Well, *wasn't* working. After an hour fidgeting with stuff the phones just started running perfectly again! Both channels are fine. But everytime I tried to measure that wire it never gives me anything, it's so bizzare.

Oh well, hopefully it'll keep working. Now I can hunt down some foam sheets to stick inside.

My set is missing those yellow discs behind the drivers, are they important? Any idea as to a good subsitute? I was just planning on putting soft thick foam or stuffing inside the baffles.
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post #5 of 11
12/25/09 at 5:38pm
I don't know if they yellow pucks do all that much. It's fiberglass. Felt can probably be substituted. You would need open cell foam behind the felt to hold it to the driver.
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post #6 of 11
12/25/09 at 8:53pm
Thread Starter 
Cool, I went and bought a sheet of foam and it works wonderfully inside the baffle. It's too thick for the front of the driver though (dulls the sound) so I used some kind of paper-fabric thingie there.

Also I've been able to replicate the original problem I had by turning the volume some ways past normal listening levels. I think it's the membranes flexing too far, hitting the stators and 'discharging'? It's really easy to fix by playing around with the volume.

Back in action! (Sorry for the dust!)





(Can't believe they spelled 'earspeaker' wrong!)
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post #7 of 11
12/25/09 at 8:56pm
Voltage rating for the wire is crucial, there might not be any bias but the transformers are producing hundreds of volts.

Quote:
Originally Posted by Oya? View Post
(Can't believe they spelled 'earspeaker' wrong!)
That's Stax for ya.
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post #8 of 11
12/27/09 at 4:17am
Thread Starter 
I've got another question: the transparent membrane that can be touched are just protective films right? The actual sound-producing membrane is between the stators? I can see a small tear in the rear of one of my drivers.
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post #9 of 11
12/27/09 at 7:40am
It's the protection film, not the actual electret diaphragm.
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post #10 of 11
12/27/09 at 11:19am
Thread Starter 
Thanks.
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post #11 of 11
3/10/12 at 4:04pm

 

Tell me, you can connect headphones to the amplifier Stax SR80 Stax SRM-600 ?

Do not they burn ?

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