well i have a mtx 801D that i want to sale i used it for a month but i upgraded to a kenwood( its regular price 499.95 i want 150$ ) here are the specs: Thunder801D Class D Amplifier Input Hi Level w/ Smart Engage Low Level Input Crossover(s) Low Pass @ 40Hz-200Hz - Variable Compression Circuitry Thunder EQ EBC2 Port RCA Output Low Pass Only Dimensions (with ISO Feet) 11.5" x 9.75" x 2.1" 29.3cm x 24.8cm x 5.3cm RMS Power 12.5 VDC 2 Ohm Load 500 w x 1 4 Ohm Load 250 w x 1 Dynamic Power 14.4 VDC 2 Ohm Load 800 w x 1 4 Ohm Load 400 w x 1