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The B4 works optimally with about 1800 watts (roughly 500 watts to each dB-12 Plus woofer). People are getting very good results with as little as 800 watts (200 watts pers driver), since the B4+ is quite efficient and can reach high SPL with reasonable amounts of power.
Clearly, you'll be down about 4 dB in maximum output, as compared to a Crown K1, and you don't want to be in the position of clipping the amp just to "see what she'll do" and cooking the VCs. When it comes to subwoofing, it's always better to get more clean power than you think you'll need to avoid clipping.
I would not bridge the Peavey into 4 ohms; it might go up in smoke. The Behringer amp discussed here recently seems to be getting good press for the $$.
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