I have an HTPC which I use to watch WM9 HD DVD material e.g. Terminator 2 Extreme, as well as the usual duties. As you know WM9 uses its own surround sound system which cannot be passed via SPDIF to my AV Processor. To watch WM9 material in surround I have to connect the outputs of my M-Audio Revo directly to my power amp. The obvious solution would be fit a 5.1 bypass to my AV processor. If I leave the audio card connected to my power amp I have to ensure that the power amp and sub are switched off when I start or shutdown the PC to avoid a pop through my speakers. I was wondering if there is another way of doing it ? Does anyone make a black box that takes 5.1 in via phono sockets and outputs coax spdif to feed to my AV processor ? The above solution would also allow DVD-audio via SPDIF. Any other suggestions ?