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WEILIANG, or BRZHiFi... board E600 V1.7

SoNic

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I got this from Aliexpress. installed under my PC monitor.
My sound card is a SoundBlaster ZxR, with a dedicated headphone amp, with one TPA6120A2 chip. Was doing great for my AKG K701 (62 ohm impedance), but was kind of struggling with my HiFiMan Deva Pro (16 ohm).
I decided to give a try to this E600 amp, because it has two TPA6120A2 chips, in a balanced mode, how the application note recommends them to be used. The Deva can take balanced input too, with the proper 4 pin cable. I have ordered one but it didn't arrived yet.
So I tested it with the unbalanced output. The input is unbalanced anyway, from my PC soundcard.
First, it was having a slight buzz on the RCA input. I was pissed. I had around a small ground loop insolation transformer, put it in on the RCA cables... quiet. That was OK, but it was still bugging me why. Tried a wire between the two cases... not a change.
Eventually I took out the fat, pretty, boutique RCA cables (Monster) and used one of my old cable (from 80's or 90's ?). Holly cow, there was no more buzzing noise!
Yesterday I could not stop listening to music. So much bass, so much airness... I can take it as loud as I want, to ear hurting levels and not a problem. I can't describe how much better sounds that the one chip on the sound card board. Maybe because that also has a passive volume control, that didn't like the 16 ohm at all? IDK.
The board comes with three options of OpAmps, I choose the cheapest one, with JRC NE5532DD. I swapped them with a couple of LM4562NA that I had around. I have done extensive rolling experiments and for me, those are the best sounding. I even used a couple of them inside my sound card (it has sockets for front channels).
The mains is connected trough a fuse holder, in the socket, and the ground wire is connected directly to the case.
I hope the balanced cable comes soon, I can't wait to test it in the proper configuration.

I am happy that for $90, I had such good results. Not sure how it would "measure" if @amirm would measure it, but it sounds good to me.
 
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SoNic

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SoNic

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I got today the balanced XLR to 3.5mm cable and hook it up. Tested, it seems in phase and correctly L-R.
However, I can hear distortions at higher levels bass, in left channel that were not there before. Wonder what's that about... maybe is not wired correctly...
 
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SoNic

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I forgot to revisit the post.
I bought another balanced cable and with that one, no distortions.
With my meter I found the difference - the "good" cable has wired, at the 3.5mm TRS jacks, only the tip and the sleeve (each channel). Sleeve is not connected.
The "bad" cable, has the sleeve connected together with the ring. Bad for HIFIMAN internal headphone connection.
 
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