I've also been told though this is a under rated amp
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Here the spec's straight from the site.
ULTIMATE series A3 is a powerful two-channel amplifier. A true, dual mono block with separate power sources that provides power output of 2 x 150 Watts with 4 ohm stereo and 550/870 Watts with 4/2 ohm mono. The amplifier is 1 ohm stable.
Built-in fan control. Built-in, variable 50-125 Hz switchable low-pass filter for subwoofers. Built-in variable 20-200 Hz. high-pass filter that can be used as a subsonic filter or high-pass filter for front systems. Dual power terminals where you can connect dual power feeds or a DLS Power Cap. Button for switching phases when you use it as a subwoofer amplifier.
- RMS output per channel at 13,8 volts, 20 Hz - 20 kHz ,
Specifications
Number of channels 2
Amplifier class AB
Output power in 4 ohm 2 x 150 W
Output power in 2 ohm 2 x 270 W
Output power in 1 ohm 2 x 425 W
Mono bridge mode 4 ohm 550 W
Mono bridge mode 2 ohm 870 W
Mono bridge mode 1.33 ohm 1000 W
Damping factor > 200
S/N ratio, A-weighted > 100 dB
Input impedance, high level N/A
Input sensitivity 0,2 - 7 Volt
Input impedance > 10kohm
Frequency range 10 Hz - 50 kHz
High pass filter 20 - 200 Hz
Low pass filter 50 - 125 Hz
External cooling fan terminal 1
Dual DC inputs 1
Power consumption (idle) 1,1 A
Power consumption (max) 140 A
Rec. power cable Minimum 2AWG / 33 mm2
Fuses 4 x 30 A
Dimension (W x D x H) 410 x 240 x 73 mm (16,15 x 9,45 x 2,87 inch)
Weight 6,2 kg ( 13,67 lb