I think you'll find that with a pair of L1 Compacts you'll have all the bottom end you will need, plus the advantage of the incredible clarity that the Bose systems provide. Before rushing out and purchasing a powered sub, I would try the pair of L1 compacts first.

Good luck,

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)