Rockford Fosgate POWER1000 ROCKFORD FOSGATE 5 CH 1400W CAR AMP Class bd Subwoofer Channel/Class AB Main Channels CEA 2006 Ratings for Real-World Power and No Bogus Specs 24 dB/Octave Linkwitz-Reilly Crossover Alignment Variable 40-4,000 Hz Low-Pass and High-Pass Crossovers (main channels) Variable 32-250 Hz Low-Pass Crossover (sub channel)