SQ is an opinion, but I have never liked the sound from the L7... I have read that L7 installs have won numerous SQ competitions though. It really depends of your preference and definition of SQ. I would recommend trying a low tuned ported box as I've heard L7s dont like sealed.
L7's just aren't designed to be an "SQ" driver. In a sealed box they might be a tad more accurate, but a ported box is where they belong. You're going to lose output putting them in a sealed box.