If you were going for SPL, I'd say go for the 3 L7s ported. However, for SQL, out of your choices, I'd go with 3 Qs sealed - hands down. 3 sealed Qs will get plenty loud enough for anything short of SPL competing and will sound much better than the L7s. I had 2 12L7s ported and ditched them after 3 months for a 15" Mag sealed. The L7s get loud, insanely loud for their cost, but they get pretty muddy with fast beats and just aren't a very musical sub IMHO. They don't sound like *** like some claim, but they're definitely not a SQ sub.
