Reply To: Bad audio quality through SCART from Genesis (using headphone out) – OSSC 1.6

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January 31, 2018 at 11:51 PM #18882
marqs
Participant

I have a model 1 VA1 board over here now and have investigated the issue a bit. Distortion appears to be a common flaw in model 1 VA0-VA2 boards due to excessive pre-amp gain. In my tests distortion was most apparent when actual headphones were directly connected to the socket. Aside from various amp replacement mods, the issue can be also fixed with simpler methods described in this thread.

Below are samples from before and after applying the fix:

Sample 1 (ossc with AA-filter, vanilla VA1)
Sample 2 (ossc without AA-filter, vanilla VA1)
Sample 3 (ossc without AA-filter, VA1 with reduced pre-amp gain)
Sample 4 (ossc without AA-filter, VA1 with reduced pre-amp gain and tweaked VREF)