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  • Image of a marine amplifier on a white background.

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4-Channel Class D Marine Amplifier JL Audio Genuine, 280W RMS, OEM MHX280/4 (98403)

JLMHX280/4

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£354.88 GBP
£354.88 GBP
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Product Specifications and Features

The JL Audio MHX280/4 is a genuine compact, full-range 4-channel Class D marine amplifier engineered for space-limited installations where moisture and corrosion resistance matter. With JL Audio’s efficient NexD™ switching design, it delivers clean power without overloading smaller charging systems.

  • Rated RMS power @ 14.4V (<1% THD+N): 50W x 4 @ 4Ω, 70W x 4 @ 2Ω, 140W x 2 bridged @ 4Ω
  • Rated RMS power @ 12.5V (<1% THD+N): 36W x 4 @ 4Ω, 52W x 4 @ 2Ω, 100W x 2 bridged @ 4Ω
  • Frequency response: 20 Hz – 20 kHz (+0, -1 dB)
  • Crossovers: Independent front/rear selectable HPF or LPF (defeatable), 35–300 Hz, 12 dB/oct
  • Input sensitivity (dual-range): 250 mV–4 V (Low) or 750 mV–15 V (High)
  • Minimum impedance: 2Ω per channel (unbridged) / 4Ω bridged
  • Marine-ready construction: IPX6 water-resistant design, corrosion-resistant cast-aluminum chassis, stainless hardware & gasketed control cover
  • Electrical: 35A fused, 8 AWG power/ground wire recommended
  • Dimensions (H×W×D): 1.77" × 8.66" × 3.09" (45 × 220 × 78.5 mm)

OEM references: MHX280/4 (JL Audio MFR #98403).
Supplier SKU: JLMHX280/4.

Before ordering, confirm ratings, specifications and fitment for your speakers/subwoofers and installation environment to avoid mismatches or equipment damage.

Shipping Information

All orders ship from the UK. Orders placed Monday–Thursday before 12:00pm are processed same day. Orders placed Friday after 12:00pm through Sunday are processed the following Monday. Processing times vary by stock location.

Out of stock items can be back-ordered with a typical 3–4 week lead time.

If an item shows "Dispatch Available Today" and you order after 2pm UK time, processing begins the next business day.

All times are in UK BST.

Notice: Due to ongoing conflicts impacting logistics, some deliveries or re-stocking may take a little longer than expected. We're working to get your order to you as quickly as possible.

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