DS18 NXL-X850.4D HYDRO 4-Channel Full-Range Class D Marine & Powersports Amplifier, IP67, 4 x 200W RMS @ 4 ohms

The DS18 NXL-X850.4D HYDRO is a high-output, four-channel full-range Class D amplifier designed for marine and powersports sound systems. Its sealed IP67-rated construction, compact format, and selectable crossover settings let installers build reliable multi-speaker systems without giving up essential system-tuning controls.

Key Features

• Four independently amplified channels for full-range speakers or bridged operation into appropriate 4-ohm loads
• High-efficiency Class D power stage designed to limit heat and current draw compared with traditional amplifier designs
• IP67-rated construction with UV and salt-fog resistance for challenging recreational installations
• Selectable onboard crossover modes and adjustable 40Hz–2kHz frequency range
• RCA line output supports signal distribution to an additional amplifier
• 2-channel / 4-channel input selection; LED power, protection, and clipping indicators
• Tinned OFC direct-power harness, quick-connect design, and supplied marine-grade fuse holder are described by DS18
• Thermal, overload, short-circuit, and voltage protections

Technical Specifications

• Continuous output: 4 x 200W RMS at 4 ohms; 4 x 300W RMS at 2 ohms
• Bridged continuous output: 2 x 600W RMS at 4 ohms
• Peak output (manufacturer rating): 2,400W
• Amplifier topology: digital Class D; full-range, four channels
• Minimum load: 2 ohms per channel stereo / 4 ohms bridged
• Frequency response: 10Hz–20kHz
• Signal-to-noise ratio (1W at 4 ohms): >83dB
• Efficiency at 4 ohms: 83%
• Total harmonic distortion: <0.04%
• Input impedance: 20k ohms
• Channel separation: 60dB
• Low-level input sensitivity: 200mV–5V
• Crossover: HPF / Full / LPF; 40Hz–2kHz
• Fuse protection: 2 x 50A (100A total)
• Thermal-protection threshold: 78°C
• Supply-voltage protection range: 7–16V
• Power-input wiring: 8 AWG tinned OFC
• Protection rating: IP67
• Finish: black brushed aluminum

Installation & Setup

• Supply the unit from a properly fused 12V electrical system and route wiring according to ampacity and vessel/vehicle practice
• Observe the 2-ohm stereo and 4-ohm bridged minimum impedance limits
• Choose HPF or other filter settings to match the connected speakers; avoid unnecessary deep bass in small full-range drivers
• Keep terminal connections secure and route signal leads away from high-current cables
• Install in a location that permits service access and heat dissipation even with the IP67-rated enclosure

Compatibility

• Works with marine and powersports audio systems accepting RCA low-level signal inputs and using compatible 2-ohm stereo or 4-ohm bridged loudspeaker loads