I found that Yamaha Receivers, several have front preout
for the front Speakers, I have a few functional comments.
efficient to reduce power needs, helps keep components and their heat smaller, more placement options, remote beams placement, and saves money.
mine vintage DBX Soundfield 100, none for sale now it seems, were designed to provide full range and to project a wide center image so 3 people on a couch get very good imaging. just read about them so you keep it in mind when considering options.http://www.hifi-classic.net/review/dbx-soundfield-100-135.html
One way, conventional box front facing drivers (my music system speakers) is to have the ability to easily change the toe-in. Think about methods to do that. Felt or plastic slip sheets; 3 wheels if speakers are heavy enough, ...
as you will be listening to:
2 channel, you alone, normal toe-in, speakers directed at the center spot. Or, you and a friend listening to 2 channel, or 2 or 3 viewing, or, like Donna and I, always at each end of the sofa, our own coffee warmers, phone chargers, coasters, ... You change the toe-in aim left speaker at right end of sofa; aim right speaker at left end. works.
also: low bass: mains full range, so the bass is there for 2 channel or when using AVR, and if you alter the toe-in, everything is similarly directed.
I added 1 sub for video only, sub out of AVR, just for Dinosaur Stomps, Black Halk Down, Movie Domino Soundtrack (whew!).
If you go with smaller mains and a pair of self-powered subs, you want those subs on for all modes, 2 channel only and video. I recommend a stereo pair, front facing, no ports, adjacent to the mains to help keep directionality of bass as created by both the fundamentals and their overtones, i.e. 40, 80, 160, 320 ... Two subs: if you can return them, try a smaller pair, perhaps 8", depends on room size, mains driver sizes, just to say, don't over-do it, a bit smaller helps buying 2 easier.