DS18 NXL-M4 HYDRO 4-Channel Full-Range Class D Marine & Powersports Amplifier, 4 x 150W RMS at 4 ohms, IP55

The DS18 NXL-M4 HYDRO amplifier is designed to drive marine and powersports speakers with efficient Class D amplification. Its IP55-rated enclosure and variable audio adjustments make it suitable for boat, UTV, and off-road installations while preserving the distinct power specifications at each load impedance.

Key Features

• High-efficiency Class D output stage supports installation in constrained marine/powersports compartments.
• 4 x 150W RMS at 4 ohms; individual load-specific ratings are listed below.
• Adjustable filtering supports speaker protection and system tuning.
• IP55 water-resistance classification; corrosion-conscious electrical installation remains essential.
• Integrated power, protect and clipping status indication and protective circuitry.
• Stereo operation and supported bridged configuration provide flexible choices for full-range speaker systems.

Technical Specifications

• Amplifier topology: Class D
• Channel arrangement: 4-Channel Full-Range
• Ingress protection: IPX5 (splash-resistant; DS18 also references IP55)
• RMS output at 4 ohms: 4 x 150W
• RMS output at 2 ohms: 4 x 230W
• Bridged output at 4 ohms: 2 x 440W
• Peak power rating: 1800W
• Frequency response: 20Hz–20kHz
• Signal-to-noise ratio: >90dB
• Channel separation: >55dB
• THD: <0.15%
• Low-level input sensitivity: 0.2–6V
• High-level inputs: Yes
• Crossover: Selectable high-pass, low-pass or full-range; 40Hz–2kHz
• Bass boost: 0–12dB at approximately 45Hz
• Minimum load: 2 ohms stereo / 4 ohms bridged
• Recommended fuse specification: 2 x 35A (70A total)
• Power terminals: 4 AWG
• Dimensions: 9.6 x 4.5 x 1.7 in. (245 x 116 x 43mm)

Installation & System Integration

Provide a dedicated fused battery feed sized to the amplifier power demand, a short solid ground, sufficient mounting clearance and serviceable signal wiring. Connect each channel only to a supported speaker impedance. Bridged ratings require the specified 4-ohm load. Tune gain and active filters with the system playing cleanly rather than using gain as a volume control. Keep wiring, terminals and mounting points protected from saltwater and prolonged water immersion.

Compatibility

Use with 12V marine/powersports audio systems and speakers wired to meet the manufacturer-listed minimum impedances. Monoblock models drive subwoofer loads; multi-channel full-range/subwoofer models provide independent speaker and bass outputs.