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.
| @ 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 |
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 |
Yes |
| Filter Defeat Function |
Yes |
| Remote Level Control |
No |
| 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 |
MX280/4 Product Manual
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