REF4.920 - Soundstream 4 Ch. 920 Watt RMS Class A/B Reference Series Power Amplifier 145 Watts RMS x 4 @ 4 ohms 215 Watts RMS x 4 @ 2 ohms 460 Watts RMS x 2 Bridged @ 4 ohms Regulated MOSFET power supply Damping Factor: &gt;1000