Lewhite - very good question. I ended up with full range speakers but considered monitors and sub. Not only room has often nodes but designers of monitors tune bass reflex to stretch lows creating hump on first multiple of reflex frequency - usually around 80Hz. How to get rid of it? Some subs like JL allow to equalize sub/room using microphone plugged into sub but it cannot equalize hump (or room nodes) that is above cutoff. I've heard of bass traps (tubes) but never tried them.
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