Specifications: 1) AAM 4.1&2.1 2) True MOSFET circuitry 3) Multi-strength power supply toroids 4) THD: 0.05% 5) S/N Ratio: >90dB 6) Frequency response: 20Hz-20kHz (+/- 05dB) 7) Low-pass crossover: 30Hz To 180Hz 8) Variable bass boost: 0 -18dB (45Hz) 9) Throughout RCA connections 10) 4-way protection circuitry: thermal, short circuit, overload, and DC offset 11) Alterable crust color 12) Nickel / gold - plated block terminals 13) 4 ohms stereo + 4 ohms SUB: 70W x 4 + 200W x 1 14) 4 ohms mono + 4 ohms SUB: 200W x 2 + 200W x 1 15) 2 ohms mono + 4 ohms SUB: 200W x 4 + 200W x 1