Benchmark AHB2 Power Amplifier, Silver 100W Stereo 8-Ohms, 190W Stereo 4-Ohms, 380W Mono 8-Ohms, 480W Mono 6-Ohms 132 dB SNR A-weighted 0.00011% THD+N 0.1 Hz to 200 kHz +0/-3 dB frequency response Made in USA