x2 yeah i've seen some 13w7's in sealed boxes that are a bit too small and they don't do much at all... but then again i've seen a 10w7 in some kind of tube form ported box push around 145... i've heard of people getting 150 from one but never seen it... just my personal opinion: i just find that at very high levels the L7's seem to let off a generic buzz on all frequencies, possibly because the square form produces an uneven force on the cone mass causeing harmonic distortion a round cone allows for the most even distribution of power over the cone the more vertices you add the harder it is to balance that force, at high volumes esspecially, anyone heard that 18" solox... not very good SQ indeed not much at all from the 5 different setups i've heard... just my opinion... i think that the square forms are hurting kicker yea they are loud due to the increased piston area... but to design a speaker to sound good it doesn't make much sence to make it a square, wish they still made the round ones...