FS#11364 - AS3543 volume increase
Opened by MichaelGiacomelli (saratoga) - Sunday, 06 June 2010, 18:32 GMT
Last edited by MichaelGiacomelli (saratoga) - Thursday, 24 June 2010, 01:15 GMT
Volume tests of RB, the OF, and different amp settings are here:
RMAA tests driving a load for the OF, RB and various settings are here:
Specifically, these two entries for the current SVN build and the patched one:
The AS chips use a two step volume control with separate levels for the DAC and headphone amp. This patch increases the DAC volume 7dB. So basically, +6dB in the current build (which does not distort) becomes 0dB in the patch (which also does not distort). The new +6dB corresponds to actually over driving the amp, and does distort (but probably not enough to notice in real music verses a full scale test tone).
Interestingly the OF can drive as loud as our new +6dB with very little distortion, which might suggest we don't have one of the voltages set right somewhere. If we ever get a JTAGed as3525v2 player it would be great to dump the AS3543 registers.
Thursday, 24 June 2010, 01:15 GMT
Reason for closing: Accepted
Additional comments about closing: Committed as r27101.