MX280/4 4 Channel Class D Full-Range Amplifier

4-Channel Class D Full-Range Amplifier, 70 W x 4 @ 2 Ω / 50 W x 4 @ 4 Ω - 14.4V

Engineered specifically for powersports applications, the 4-channel MX280/4 amplifier employs our high-speed NexD™ switching design to deliver plenty of clean power, without straining charging systems. Its tiny, cast aluminum chassis is highly resistant to corrosion, with an IPX7 water-resistance rating, making it perfect for motorcycles, ATV’s or other utility vehicles.

Generating a solid 50W x 4 into 4 ohms (14.4V, 1% THD), the MX280/4 is fully bridgeable, so it can be used as a 3-channel amplifier, or as a 2-channel amplifier producing a potent 140W x 2 into 4 ohms.

Other features include independent front and rear crossovers with selectable full-range, high-pass or low-pass filter controls and a dual-range input section that accepts a wide range of input voltage levels, from line-level all the way to high-power speaker level signals.

This amplifier features a rugged powder-coated finish, a gasketed cover for the controls and stainless steel hardware for durability.

General Specifications

• Frequency Response 20 Hz - 20 kHz (+0, -1dB)
• S/N Ratio, referred to highest rated power >89.5 dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth)
• S/N Ratio, referred to 1 W >68 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)
• Damping Factor @ 4 Ω >60 / 50 Hz
• Damping Factor @ 2 Ω >30 / 50 Hz
• THD+N @ Rated Power <1% @ 2 Ω per Ch.
• Input Voltage Range @ RCA Inputs Switchable from 250 mV - 4 V RMS (Low) to 750 mV - 15 V RMS (High)
• Min.Copper Power / Ground Wire Gauge 8 AWG wire
• Fuse Rating 35 A (AFS, AGU or MaxiFuse™)

Signal Processing

• Filter Mode(s) Low-Pass or High-Pass
• Filter Slope(s) 12 dB/octave
• Filter Frequency Range 35 Hz - 300 Hz
• Detented, Calibrated Filter Freq. Potentiometers
• Filter Defeat Function
• Remote Level Modes N/A
• Channel Input Mode Switch Yes (2/3/4 ch.)
• Pass-Through Preamp Output None
• Source Channel Selection for PreOuts N/A

Physical Specifications

• Height (H) 1.77 in / 45 mm
• Width (W) 8.66 in / 220 mm
• Depth (D) 3.09 in / 78.5 mm
• Net Weight 3.18 lb / 1.44 kg

Rated Continuous (RMS) Power @ 14.4 V

• @ 4 Ω 50 W RMS x 4
• @ 2 Ω 70 W RMS x 4
• Bridged @ 4Ω 140 W RMS x 2

Rated Continuous (RMS) Power @ 12.5 V

• @ 4 Ω 36 W RMS x 4
• @ 2 Ω 52 W RMS x 4
• Bridged @ 4Ω 100 W RMS x 2

What's in the box:

• 4-Channel marine amplifier with 12" power/signal pigtails (with in-line fuse holder and 35A ATO fuse installed)
• Spare 35A ATO fuse
• 4 Self-tapping screws (1" length)
• Owner's Manual