Your ADCOM GFA-555 represents the most advanced thinking in audio amplifier design. At 200 watts per channel, the GFA-555 offers an exceptional value; superior performance at a reasonable price. Some of the outstanding features of this product are: - 200 watts per channel* 20Hz-20KHz * into an 8 ohm load with both channels driven with less than 0.09% total harmonic distortion. - 325 watts per channel, 20Hz-20KHz, in to a 4 ohm load with both channels driven with less than 0.25% total harmonic distortion. - The ability to drive very low impedance loads. - Bridged mode power of 600 watts, 20Hz~20KHz, into a 8 ohm load with less than 0.25% total harmonic distortion. - Instantaneous Distortion Alert which indicates whenever distortion products are above the 1 % level.