This might be a silly question, but unless I ask I won't learn. I'm considering buying a Rel Quake subwoofer. I understand it's downfiring. What does this mean? The bass output aims downwards towards the floor? If so, does the type of floor affect the effect of the sub, eg whether if I have a carpet or not? My room is carpetted, so will this be favourable to the performance of a downfiring subwoofer? Thanks.