The JL Audio MHD900/5-24V is a compact, high-fidelity 5-channel Class D marine amplifier designed specifically for 24V negative-ground electrical systems. It’s built as a space-saving “one-box” solution to power four full-range speaker channels plus a dedicated subwoofer channel, with marine-ready finishes and sealed control protection.

Important: Not for use in 12V systems. Confirm system voltage, speaker impedance and wiring before installation to avoid equipment damage.

Key features

• 24V-only operation: designed for 22–29 VDC charging systems
• 5-channel system design: main channels + dedicated subwoofer channel
• R.I.P.S. regulated power supply for consistent output across rated load ranges
• Differential-balanced RCA inputs with switchable input voltage ranges
• Onboard crossovers: selectable 12 dB/oct (Butterworth) or 24 dB/oct (Linkwitz-Riley), 50–500 Hz range
• Optional sub level control: compatible with JL Audio HD-RLC remote level controller (sold separately)

Verified specifications

• Channels: 5
• Rated power (main channels, stereo): 100W RMS x 4 @ 4Ω (22–29V); 75W RMS x 4 @ 1.5–3Ω (22–29V)
• Rated power (main channels, bridged): 200W RMS x 2 @ 8Ω (22–29V); 150W RMS x 2 @ 3–6Ω (22–29V)
• Rated power (subwoofer channel): 500W RMS x 1 @ 1.5–4Ω (22–29V)
• Frequency response: main 12 Hz–28 kHz (+0/−1 dB); sub 12 Hz–10 kHz (+0/−1 dB)
• Signal-to-noise ratio: 108 dBA (referred to rated power)
• THD at rated power: 0.03% @ 4Ω per main channel; <0.05% @ 4Ω (sub), average at 1 kHz
• Input sensitivity (switchable): 200 mV–2 V RMS (Low) / 800 mV–8 V RMS (High)
• Recommended fuse: 30A (AFS, AGU or MaxiFuse)
• Chassis dimensions (L x W x H): 10.74 x 7.85 x 1.93 in (273 x 199.5 x 49 mm), not including connectors

What’s in the box

• MHD amplifier
• Power input plug
• Speaker connection plug(s)
• Four mounting feet
• 2.5 mm Allen wrench and 4 mm Allen wrench
• Four machine screws

OEM reference: JL Audio 98229 (model: MHD900/5-24V). Supplier: Recmar.

Before ordering, confirm specifications, ratings and fitment for your vessel’s 24V system and your speaker/subwoofer load requirements.