Jeffrey, you didn't mention whether you used the Gallo bass amp. In case you don't, consider a 4- or 5-channel solidstate amp. Use 2 channels to drive the speakers full range and 2 more channels for the woofers' 2nd voicecoils. It would be fairly easy and inexpensive to create a low-pass filter for the bass channels, or you could look for an inexpensive low-pass electronic crossover/filter such as the ancient Dalquist DQLP-1 (one of which I just found!). It includes 2nd-order low-pass filters, a variable-bass-boost control, and, of course, bass-level controls. You would NOT need to run the full-range signal thru it.
I'd look at the B&K 200-series poweramps. Of course you'd then need a preamp, but you certainly can include one for your $4500 budget.
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I'd look at the B&K 200-series poweramps. Of course you'd then need a preamp, but you certainly can include one for your $4500 budget.
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