quite so. An ideal in today's hifi world is that a receiver should be able to sustain output with all channels driven simultaneously-- so if a sound designer wants to simultaneously put instruments in the front and rear of a room, he can. With your receiver, the surrounds are second class...
which is entirely different. Multisource is akin to zones, while a multichannel input is a collection of 6 (or 8) RCA jacks-- one for each of right, left, centre, right surround, left surround and subwoofer. It's useful for DVD-Audio, SACD, and HD-DVD.
Denon, Onkyo, and Yamaha all have experience with designing video circuits, or at least with selecting the proper designers-- as all three have DVD players on the market. Pioneer even makes televisions. (So does Sony, but their receivers are... eh...) I suppose you would have to see the...
Probably not such a great idea if you're going to be using digital-- as the chances of your set passing dolby digital/dts signals properly is slim to none. What you could do is get a receiver with hdmi upconversion. Then, you could plug the video and audio of your DVD player, various tuners...
Most receivers support phantom center channels. My receiver allows the user to set speakers as "large", "small", or "none". If the center channel is none, the audio intended for the center channel gets mixed in with the left and right channels.
The paradigm 9seMk3s have a 3db response of 45Hz to 20 Khz, with "bass extension" to 32 Hz. A pretty powerful, big, and expensive subwoofer is needed to accompany them, and I'm not all sure that any television programs, even an HDTV program, will really take advantage of it. DVD's, Sure. But...
HD uses dolby digital as its audio codec. Usually, this comes in two varieties-- dolby digital 2.0 (stereo) and dolby digital 5.1. Some channels only offer dolby digital 2.0, and others don't know how to properly operate their dolby digital encoders. Your tuners/ dvr must have digital...
If you have decent main speakers, you should also get a decent centre channel-- otherwise, the timbre changes will be distracting. I suppose that if you always sit in the sweet spot, it's not needed. If you share this home theatre with others, then a centre channel can be useful. As for the...