[granoj]

Hi all
 
I recently acquired SR-X mk3 with two SRD7sb energizers. I`ve been testing them and I`m pretty sure the headphones aren`t working properly. There is no bass at all. With some heavy EQ lift there is some bass but the sound is unnatural and very tiring. I´ve tested with both energizers and the results are the same. My reference is Stax SR-303. Any ideas? 
 
Thanx,
 
Jarno

 

[granoj]

Bump, anyone?
 
The energizers are 30+ years old, maybe dried capacitors?

 

[nick n]

hmm not sure, but there is a dedicated Stax thread you will find better results in, as well as a Vintage Stax thread there also
 
 
http://www.head-fi.org/t/223263/the-stax-thread-new
 
 
http://www.head-fi.org/t/588716/vintage-stax-repair-and-maintenance
 
good luck I'm curious as to what's wrong there also. It may very well be that you are hearing them the way they are meant to be.

 

[granoj]

Thank you very much! Have to try this http://www.head-fi.org/t/588716/vintage-stax-repair-and-maintenance#post_8093372

 

[nick n]

oh I overlooked that you just got them so yes that's definitely the first step to try.  I remember once i pulled the adapter plug out of the wall during cleaning and forgot about it, then thought the headphones were shot, luckily I

noticed 
 
Glad you found something to check out.
 
The SB( self bias ) adapters only get the power when the stereo is on, whereas the AC adapter boxes draw power from the wall , just a reminder. You probably knew that though

 

[granoj]

okay, headphones are warming up now. I made a quad output on my soundcard so I can listen through speakers while charging the Stax...
I am a little afraid this is the problem
 
Quote:

Most of these are due to the massive volume mismatch between the headphones and speakers connected to the loopout.  Forget to turn down the volume before turning the switch and you get 400+Vp-p- on the stators and the diaphragm starts to arc. 

 

[granoj]

this is how much EQ must be applied before you can even think about listening the headphones. just a ruff curve for illustration purposes.

 

[spritzer]

The caps in the bias supply could be perished so well worth it to replace and the drivers could be fubar from arcing.  They will also need to charged up because of the coating getting old and deteriorating.