Hoping someone can help? I have a HTPC setup using a ATI 5450 for audio which is mainly used for bitstreaming over HDMI via MPCHC / PDVD to a Onyko 870. It's a 5.1 setup using a REL sub and when bitstreaming (AC3, DTS, DTS HD etc.) the sub works beautifully. Within W7 i've setup the ATI HDMI audio device to have 5.1 speakers and the speakers all test correctly within windows. When i use Winamp i get no sub activity just L/R channels which is a problem as i've setup the crossover frequencies within the amp to output very little bass to the rest of the speakers. On the amp itself i've tried various settings e.g. stereo, multi channel, direct, pure audio and none produce any sub activity via Winamp. Help?