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Stax SR-009 Channel Imbalance Trouble / Driver Problem?

post #1 of 654
Thread Starter 

I now have a different pair as I had to return my original ones because of trouble with the right driver (I suppose). The signal didn’t completely go out but after a couple of days the channels became very unbalanced with very little sound coming from the right. I thought it might be the used SRM-717 I just picked up, but I went back to the store and tested the phones with another amp. Sure enough, it wasn’t the amp and my replacement pair (#1014) works great with it. Not sure what happened, as I certainly did not play the old pair at excessive volumes.

 

I only needed to work with the store where I bought them because the problem quickly surfaced but I am appreciating that these babies come with a warranty. 

 

Hopefully, this post will be slowly buried over time with my previous pair of SR-009s (#1062) being an isolated case. However, I made this a separate thread just in case.

post #2 of 654

 

Wow - quite disturbing, particularly for people outside Japan who might have a hard time exchanging them.

 

It's good there was a replacement pair in stock for you.

 

post #3 of 654

Sure hope this is a rare case

post #4 of 654

I bought my pair , 2nd on the waiting list from Pricejapan.

I have been in contact with the first buyer of PJ to exchange info.

My pair is OK but the first customer's pair also have channel imbalance.

With the info from Gu Sensei, I think  that it is a real problem.

I have cautioned my friends not too hurry to purchase the SR009 now because

of the channel imbalance.  Wait until more info.

I hope that it will not be the same as the Ultrasone ed 10


Edited by kiertijai - 5/28/11 at 3:26am
post #5 of 654

Sorry to hear about your troubles Gu Sensei. FWIW, I've used mine for a week, maybe 12-16 hours total and no issue so far. I found out today that the warranty is only 1 year so hopefully this is something that declares itself in the first hours rather than after a while.

 

It would be good to hear the official reason for the issue from stax, for instance is it related to the low yield from their manufacturing of the electrode (under heat / pressure). If so, maybe it would mean they're not always sure the manufactured electrode is totally defect free? Humm, hope not.

 

post #6 of 654

I am victim of this problem as well. It is so disheartening as this  headphone cost alot and sounded so good.   I have shipped back to Price Japan for a warranty repair or replacement. frown.gif


Edited by hentai - 5/28/11 at 8:57am
post #7 of 654

Is there any distortion that crops up with this issue? 

post #8 of 654



 

Quote:
Originally Posted by spritzer View Post

Is there any distortion that crops up with this issue? 



Yes , not only the left side has less volume, it also has distortion when there's bass. Definately not my amp

post #9 of 654

Spritzer, did the original Omega have similar problem when they were first released?

post #10 of 654

 

Never be an early adopter - it's always good to wait until they fix the almost inevitable kinks in the product and/or manufacturing process.

 

post #11 of 654
Quote:
Originally Posted by hentai View Post



 



Yes , not only the left side has less volume, it also has distortion when there's bass. Definately not my amp


Ok, that's not good at all.  Most likely scenario is an intermittent bias supply as that most often presents like that.  "Normal" channel imbalance is cause by a parasitic charge sitting on the diaphragm and not being dissipated due to the extreme resistance of the coating.  That won't cause distortion as it just diminishes the potential of the drivers so distortion would only creep in if you push the amp hard to make up for the difference. 
 

Quote:
Originally Posted by AudioCats View Post

Spritzer, did the original Omega have similar problem when they were first released?

 

Nope.  Channel imbalance has been an issue with them (and every other Stax for that matter) but there is another reason for that. 
 

 

post #12 of 654



 

Quote:
Originally Posted by spritzer View Post




 

Nope.  Channel imbalance has been an issue with them (and every other Stax for that matter) but there is another reason for that. 
 

 



are you talking about charge build-up?

 


Edited by AudioCats - 5/28/11 at 2:02pm
post #13 of 654
Quote:
Originally Posted by hentai View Post

I am victim of this problem as well. It is so disheartening as this  headphone cost alot and sounded so good.   I have shipped back to Price Japan for a warranty repair or replacement. frown.gif


Luckly, my SR-009 is working perfectly. At least until the time being... Myne is number 10015
 

Had this problem with my old SR-007 Mk1. Took a couple of months to STAX to fix it.

 

 

 

post #14 of 654

Dear Gu,

 

Mine is #1015 and is working perfectly as until now... let's hope it continues that wa.

 

Quote:
Originally Posted by Gu Sensei View Post

I now have a different pair as I had to return my original ones because of trouble with the right driver (I suppose). The signal didn’t completely go out but after a couple of days the channels became very unbalanced with very little sound coming from the right. I thought it might be the used SRM-717 I just picked up, but I went back to the store and tested the phones with another amp. Sure enough, it wasn’t the amp and my replacement pair (#1014) works great with it. Not sure what happened, as I certainly did not play the old pair at excessive volumes.

 

I only needed to work with the store where I bought them because the problem quickly surfaced but I am appreciating that these babies come with a warranty. 

 

Hopefully, this post will be slowly buried over time with my previous pair of SR-009s (#1062) being an isolated case. However, I made this a separate thread just in case.



 

post #15 of 654
Quote:
Originally Posted by AudioCats View Post

are you talking about charge build-up?

 


Nope, the SR-Omega chassis slowly breaks apart which causes the drivers to go out of alignment. 

 

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