I do not agree with 7.1 being useless. It's great for stereo surround(left/right x3), as well as adding "ambience" filler sounds with certain receivers on 5.1 content. Quite a few DTS movies have 7.1 tracks now, too, contrary to what has been posted. Well over 500, actually. Most DTS-HD are 7.1, F.Y.I. DTS delivers higher-quality audio than Dolby Digital, in certain formats, so if you want the best sound, look towards 7.1 and DTS content....again, contrary to what's been posted. I use a Yamaha 8160 7.2 amp. There are many 7.2 amps now. Why .2? Most of what I listen to is stereo content. Usually, stereos with 7.2 send both left/right bass to each respective sub, as well as L.F.E. effects from movie soundtracks(which get broadcast on both). I find that because most users cannot get "perfect" speaker placement, .2 offers a better choice for balanced bass output.