MB Quart DA110004 Brand: MB Quart Features: All new ground-up design Focused mass aluminum heat sinks 6.5� wide PCB’s provide better parts spacing Ample extrusion length for high thermal performance Three-stage protection circuits On-board fusing for all models SIGNAL TO NOISE RATIO: >90dB VARIABLE HI-PASS: 60Hz-1.2KHz VARIABLE LOW-PASS: 30Hz-250Hz 45HZ BASS BOOST: 0~12dB AMPLIFIER FUSING: 35A x 3 Type: Amplifiers Amplifier Class: Class AB RMS Power: POWER @ 2-OHMS: 4x250W POWER @ 4-OHMS: 4x125W Bridged Power: MONO BRIDGED @ 4-OHMS: 2x500W Frequency Response: 10Hz-45KHz THD: