The M3Ti will (as any speaker would) get a boost in the bass if it's close to the wall, with a resonance or two ("boomy" sound). Mine are in a top corner, and without a sub were adequate for most music, even in a large room, although the resonances were there if you listened for them. Now that I have a sub, I've raised the x-over to 150Hz and I don't notice any resonances anymore.