hi tbwick. maybe we can arive at an understanding if we swap opinions on this, even if it does lead the thread a bit off topic.
if a tower is set to small and crossed over at the typical point of 80hz i dont see how it can give more bass than a bookshelf speaker also crossed over at 80hz and run with a sub which is low passed bellow 80hz. both cases should ideally, with correct room placement, yeild a flat frequency response. if on the other hand the tower is run full range and rolls off at say 30 hz, the sub would be set to take over at 30hz. In neither of these cases does the tower and sub overlap in their outputed frequencies, hence a tower shoud not according to my understanding add more bass(its only advantage is that it can offer a slightly higher spl, provided the sub can also play at these volumes)
two channel is limited compared to multichannel I completely agree. what I advocate is a 4.1 setup. then in my opinion there is no need for a centre channel if one can claim the sweetspot. by not having a centre speaker one can spend 50% more on the front two, which if set up correctly should provide a phantom centre image no less vivid than that comming from a centre channel. i really enjoy the 'magic' of centre images floating in air as opposed to coming strait out of a speaker box in front of me. whats more, unless one is using a projector with transparent screen, the centre speaker will by neccessity be locating voices and instruments bellow or above the screen. this has me literally watching the centre speaker when i should be watching the screen during music dvd's. with a phantom centre image it is no problem at all to have the voices and instruments apearing in the middle of the screen where they are meant to be.
i'm not sure what you meant by your last parragraph, maybe you misunderstood me. all I was saying in my last two points was that most people are paying for reduntand DACs, either in the sourse component of in the receiver, because only one gets used. I favour decoding in the source. my setup for high-res audio and dvd is a universal player hooked up to an analogue multi-channel pre-amp via analogue cables. not only does this save a few extra DACS, but by not having video processing in my amplifier I dont compromise audio performance.
i just like to keep it simple.
in many cases i'm sure i'm wrong, but i just think that sometimes demand is created by manufacturers and advertizers where no real need would have existed. (granted some people will 'need' AV recievers for such things as contrived multichannel redbook and tv viewing)
cheers
b