The Stax Thread III

Sep 17, 2016 at 2:50 AM Post #9,917 of 28,098
The ones I have are the L300s, and used them for a bit over a month, and I feel like the distortion goes away in about a minute or two.
Hoping that's normal. I guess this also depends on the time since they were last used? (~a week for me)
 
Sep 17, 2016 at 1:34 PM Post #9,920 of 28,098
Huh, Wierd thing... After testing today. I realized that the distortion doesn't go away after a while, but instead actually goes away when I turn on my amp (O2 amp) connected to the parallel outs of the 252S. (also goes away when disconnecting the O2 amp)
 
Wieeerd? anyone know why this might be?
(Whoa, connecting a different amp to the parallel outs, Fiio E10, makes the distortion much worse)
 
Sep 17, 2016 at 3:12 PM Post #9,921 of 28,098
Huh, Wierd thing... After testing today. I realized that the distortion doesn't go away after a while, but instead actually goes away when I turn on my amp (O2 amp) connected to the parallel outs of the 252S. (also goes away when disconnecting the O2 amp)

Wieeerd? anyone know why this might be?
(Whoa, connecting a different amp to the parallel outs, Fiio E10, makes the distortion much worse)


What is the nature of the "distortion", what does it sound like? Connecting different amps to parallel outputs would suggest a ground loop, but that would be a hum, not distortion.
 
Sep 17, 2016 at 3:22 PM Post #9,922 of 28,098
What is the nature of the "distortion", what does it sound like? Connecting different amps to parallel outputs would suggest a ground loop, but that would be a hum, not distortion.

it's like a buzzing static that consistently happens in certain parts of a song.
But the sound definitely goes away after disconnecting the amp, so its not from the audio file.
Also if at a part where I hear it only in one ear, after switching the L and R connections, the buzz switches to the other ear.
 
Sep 17, 2016 at 4:12 PM Post #9,923 of 28,098
  it's like a buzzing static that consistently happens in certain parts of a song.
But the sound definitely goes away after disconnecting the amp, so its not from the audio file.
Also if at a part where I hear it only in one ear, after switching the L and R connections, the buzz switches to the other ear.

  Bad interconnect?
 
Sep 17, 2016 at 4:35 PM Post #9,925 of 28,098

Sounds like a cap is going letting DC through. Can you get hold of a meter and measure the outputs for DC?
 
Sep 17, 2016 at 5:01 PM Post #9,927 of 28,098
  Which outputs are you referring to?

The RCA or XLRs out. I had a pre-amp that did the same thing, caps were going and it gave out a wandering and inconsistent static noise which turned out to be DC. One of your pre-amps may have better input shielding that repels the DC, the others not, hens the change there.
 
It is an idea that can be easily checked. Other ideas may be more costly and need a tech.
 
Sep 17, 2016 at 5:08 PM Post #9,928 of 28,098

@Zolkis: I use sr007/2 and sr252 with a 12V 10ah battery together with Chord Hugo which results in a very nice combo. The power supply is as a consequence extremely stable
 
Sep 17, 2016 at 5:24 PM Post #9,929 of 28,098
I don't have a working meter at the moment, but do you mean the ouputs of the 252S or my other Amp?
 
I also tested: 
1. Using different cables (at every connection)
2. Splitting the audio signal from the DAC into two, one to the 252S and one to the other amp, instead of using the parallel outs of the 252S.
 
And in both these cases it seems as long as another Amp (while it is off) is attached, there is this "distortion".
 
Sep 17, 2016 at 5:35 PM Post #9,930 of 28,098
opamp input based amps (like o2) are going to clamp the audio signal when turned off to protect the chip.
the solution seems obvious.
 

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