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Compact silver aluminium car amplifier with four channels and recessed controls

Wet Sounds

Wet Sounds Sinister SDX4 4-channel car amplifier 4x185W RMS at 4 ohms

SKU CH-PZP1-HJH76

Four-channel Class D amplifier delivering 185 watts RMS per channel at 4 ohms with crossover range from 30 to 300 Hz and bass boost up to 12.5 dB

  • TypeAmplifier
  • Amplifier Channels4
  • 185 W RMS per channel at 4 ohms for clear, powerful sound
  • Full-range Class D design delivers high output from a compact chassis
  • 8 Hz to 35 kHz frequency response covers deep bass to detailed highs
  • Adjustable 30 Hz–300 Hz crossovers and 0–12.5 dB bass boost let you tune the system
  • >113 dB signal-to-noise ratio keeps background noise inaudible

Marine-grade 4-channel amplifier

The Wet Sounds Sinister SDX4 is a 4-channel car and marine amplifier built on a full-range Class D topology with a patent-pending transformer design. It shares a single cast-aluminium chassis across the series to simplify layout planning. Rated output reaches 4x185 W RMS at 4 ohms and 4x340 W RMS at 2 ohms, with bridged mono capability of 2x685 W RMS at 4 ohms. Frequency response spans 8 Hz to 35 kHz at the 3 dB points.

Compact chassis with versatile wiring

The shared chassis footprint allows consistent mounting hole patterns whether you run one amplifier or several. High- and low-pass crossovers are adjustable from 30 Hz to 300 Hz, and bass boost adds 0-12.5 dB centred between 27 Hz and 110 Hz. Low-level inputs accept 0.2 V to 6.1 V, so integration with factory or aftermarket head units is straightforward. Built-in 15.6 V over-voltage protection guards the circuitry during voltage spikes.

Verify electrical system and speaker loads

Confirm your alternator and wiring can sustain the 60 A draw at 4 ohms or 123 A at 2 ohms stereo, and 122 A in bridged mono. Ensure speaker impedances match the selected wiring mode to avoid triggering protection. The signal-to-noise ratio exceeds 90 dB A-weighted and 113 dB referenced, so check that source units provide clean pre-outs within the 0.2 V to 6.1 V input window.

Highlights

  • 185 W RMS per channel at 4 ohms for clear, powerful sound
  • Full-range Class D design delivers high output from a compact chassis
  • 8 Hz to 35 kHz frequency response covers deep bass to detailed highs
  • Adjustable 30 Hz–300 Hz crossovers and 0–12.5 dB bass boost let you tune the system
  • >113 dB signal-to-noise ratio keeps background noise inaudible

Specifications

TypeAmplifier
Amplifier Channels4

Questions about this item

How do I confirm the Sinister SDX4 is delivering its rated 185 W RMS per channel at 4 ohms after installation?

Measure each channel with a 1 kHz test tone at 14.4 V supply; the amplifier should produce 185 W RMS into a 4 Ω load per CEA-2006 specs.

What comes in the box with the Sinister SDX4 and what must I purchase separately?

The amplifier unit is included; power and ground cables, RCA interconnects, speaker wire, fuses and mounting hardware are not supplied.

Which power rating should I match to my speakers — the 185 W at 4 Ω, 340 W at 2 Ω or 685 W bridged at 4 Ω?

Use 185 W per channel for 4 Ω speakers, 340 W per channel for 2 Ω loads, or bridge two channels for 685 W into a single 4 Ω subwoofer.

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