I have a windows 7 HTPC connected through my Yamaha receiver and it works very well but you have to turn the volume up fairly high on the receiver. I recently was setting up a fire tv for a friend and while I was setting it up (also via hdmi through same receiver) I noticed that I only had to turn turn the volume up on the receiver about half as high as I do on the HTPC to get the same volume. I do have the volume turned all the way up on the HTPC. Is there something I might be missing in my audio setup on the HTPC. I use a harmony remote to control everything and also notice that I have to be very careful when switching from the HTPC over to my directv setup because of the audio difference there as well.