My Win7 HTPC has a built-in ATI 4200 and it was connected via HDMI to my Denon AVR-591 receiver and 5.1 speaker setup. Everything was working perfectly except that I had limited BD audio options. So I upgraded to an ATI 6450 and now I have all the TrueHD etc audio-modes. But I also realized that I was no longer getting subwoofer output from Windows Media Player for (stereo) music; movies with DD51, DTS etc still use the sub properly. I think the upgraded audio-mode is telling the receiver to 'defer' to the HTPC for crossover selection but WMP is not performing any such. So my front left/right speakers are receiving full-range and my subwoofer nothing.
I have tried disabling the 'full range speaker' option in Windows' speaker config but all that does is apply a high-pass filter, i.e., it does not split-out the LFE signal to the sub-woofer.
I tried switching the Windows' speaker config to stereo and/or quad, i.e., no sub, but the receiver still isn't receiving (or processing on its own) the low freqs for the sub.
I have also tried all the receiver's surround-modes but none activated the built-in crossover -- it's convinced that the source (HTPC) is handling it.
I think I need to either:
a. reconfigure the ATI audio driver so that it still handles TrueHD etc but sends stereo signals differently, or
b. reconfigure the ATI audio driver so that *it* is creating the LFE signal from stereo sources, or
c. I need to use a different audio player, one that can create the LFE signal
Thank you for any suggestions!
P.S. My HTPC is now running the ATI Catalyst 12.3 audio/video drivers and the Properties of the 'AMD High Def Audio Device' says Provider: AMD, Date: 5/16/2011, Version: 22.214.171.12402