Bernie, when I was using the Bose L1 PAS system, which was the one I first heard Uncle Dave perform with, you could separately adjust the sub woofer, which was a nice feature. You cannot do that with the compact, but to be honest, I never really had to. The big thing with the compact was to be sure that the base unit, which contains the sub, was at least 3 feet, and preferably 5 or more feet from the wall behind you. If not, the bass would be overwhelming.
Hope this helps,
Gary

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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.)