I got some info stating that the amp is 4 Ohm stable.

Power Output: 165 Watts Per Channel, min. RMS, at 8 ohms, both channels driven, from 20 Hz to 20 kHz, with no more than 0.003% total harmonic distortion.
165 Watts per channel, into 8 ohms at 1 kHz, 0.003% THD
Total Harmonic Distortion: 0.003 % at rated power. 0.003% at 1 watt output.
Intermodulation Distortion: 0.003 % at rated power. 0.003% at 1 watt output.
Frequency Response: +0, - 1.5 dB at 1Hz-100kHz
Input sensitivity: 1Volt
Input Impedance: 20 Kohms
Damping factor: 140 (8 ohms, 1 kHz)
Signal to Noise Ratio: 120 dB (IHFA, Shorted)
Outputs: Speakers 1&2. AC OUTLET UNSWITCHED X1
Inputs: L/R Input
Power Supply: AC 120V, 60Hz
Dimensions: 465(W)x185(H)x422(D)mm. 18-1/16(W)x7-5/16(H)x16-5/8(D) inches.
Weight: 22.5Kg, 49.5 lbs.

Features:
Power switch and LED indicator
Speaker A Switch and LED indicator
Speaker B Switch and LED indicator
Speaker A and B Relay
Protection Relay
Peak Meters. Large and easy to see with soft greenish blue lighting. These meters are Extremely precise and fast power meters.
Servo Operation indicator (When power is turned on)
4 ohm stable
Rear panel features RCA in put jacks.

Convenience outlet on back of unit.
Heavy Duty bind post speaker outputs.
Convenience outlet
Made in Japan

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