Hi again,
The room is all tile and is 26 feet wide and 22 feet deep, but the 22 ft dimension opens to the kitchen and dining area adding another almost 30 feet. That's the direction of sound. So having a good amount of power seems very important (100 watts min). Also, the ceiling is very tall at about 17 feet and has no attic and is not accessible.
My budget for everything is about $1300 or so, but I'd rather build into that, not all at once. I was thinking I'd get a used system and might not even set the entire system up for some time as I piece it together.
I'm also curious, by going the 3.1 route, is there one "money" speaker in that setup? What I mean is, should the center speaker be the best speaker or should the mains be the best or should they all be equals?
Don't skimp on the center 60% of the soundtrack is anchored to it, but don't skimp on the mains either. I'm of the opinion all speakers should be equally capable. For reference viewing, each speaker should be able to output 105dB at the seating position, most people listen about 5-15dB down, so I'd say 90-100dB. For a room that large, you might need either external amplification or extremely efficient speakers, like horn loaded speakers. You haven't stated your seating distance, but let's assume 15'. At 15', 100w into a speaker rated for 89dB would be 95dB, 98 if you include room gain. To be on the safe side, I'd shoot for a headroom up to 100dB. This can be achieved either by adding more amplification or using larger, more efficient speakers. The good news is most MTM center channels are more efficient than their single driver counterparts.
Most receivers cannot deliver the 2ch rated power into 5 or 7 channels, and usually only do about 70-80% of that, so if in the future you add surrounds, you might want to take this into account. I'd look for one with preouts so external amps can later be added.
What do you mean all tile? Tile walls and tile floors or what? Ceramic tiles or...? I'd consider some rugs and some acoustic treatment to help tame the slap echo. Something like 2" Auralex wedgies would be perfect for this purpose. You could also build or buy rigid fiberglass panels, they look nicer and absorb more below 500hz, but this is a more expensive solution. The good news is the size of your room pushes the low frequency room modes down below 30hz, which can only help rather than hurt.
First and foremost though, focus on the receiver and L/R speakers.
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