MB Quart ONX4.80 4 Channel Amplifier 4 x 80 @ 4 OHMS, 4 x 160 @ 2 OHMS, 2 x 320 @ 4 OHMS 4 x 80 Watt A/B Stereo Amp Exquistie Onyx heat sink desing Variable Low Pass, High Pass, Band pass Illuminated MB Quart logo System Diagnostics