AVS Special Member
Join Date: Jan 2013
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Yes, the '906 will make a tangible difference to the sub, mainly by virtue of the Audyssey MultEQ XT setup and EQ routine. Technically correct bass management won't hurt either.
If you continue to find the bass unimpressive, keep in mind the BK Subwoofers linked earlier. There's lots of good, solid British engineering there. The Monolith Plus
looks particularly impressive. You've saved heaps of £'s so far... treat yourself to a pair of 12"/500W subs!