Stinger SPX700X4 4-Channel 700W Powersports Amplifier

Stinger SPX700X4 700W 4-Channel Full Range Class D Powersports Amplifier IPX-4/5 Weather Resistant 8 to 16V for Marine ATV UTV Motorcycle and 4WD

The Stinger SPX700X4 is a 700W RMS 4-channel Class D powersports amplifier rated IPX-4/5 for weather resistance, designed for marine, ATV, UTV, motorcycle, off-road, and mobile power applications where standard car amplifiers are not suitable. Rated at 125W RMS x 4 at 4 Ohm (175W RMS x 4 at 2 Ohm, 350W RMS bridged rear channels at 4 Ohm) from a 14.4V supply. Operates from 8 to 16V via an unregulated power supply. AUX RCA pass-through output supports multi-amplifier chaining. Includes remote bass control knob with mute for rear channels. Compact 215 x 130 x 41mm footprint with removable diecast mounting feet.

Product overview

The SPX700X4 is built for environments where moisture, dust, vibration, and variable voltage are part of daily operation. IPX-4/5 splash and moisture protection with a weather-resistant PCB resists corrosion and condensation in marine, ATV, and off-road use where a standard car amplifier would fail. The unregulated power supply design operates reliably from 8 to 16V, accommodating variable voltage conditions in powersports applications, battery-only systems, and dual-battery setups without a regulated supply.

Full-range Class D amplification covers 20Hz to 20kHz with over 100dB signal-to-noise ratio (CEA standard) and less than 1% THD+N. A 12dB/octave Linkwitz-Riley crossover adjustable from 40Hz to 400Hz and a damping factor of over 200 give the SPX700X4 the signal management needed for both full-range speaker use and subwoofer bridging.

The rear channel pair can be bridged to 350W RMS at 4 Ohm for subwoofer or high-power speaker use. The 2-channel AUX RCA pass-through allows multiple SPX700X4 amplifiers to be chained from a single source, suited to multi-zone setups on larger boats, UTVs, or custom 4WD builds. The included remote bass control knob allows real-time subwoofer level and mute control for the rear channels without returning to the head unit.

Features and benefits

IPX-4/5 weather-resistant rating with weather-resistant PCB: Splash and moisture protection for marine, ATV, motorcycle, and off-road environments where standard car amplifiers are not rated.

4-channel full range Class D amplification, 20Hz to 20kHz: Efficient D-Class operation across the full audio frequency range, keeping the amplifier cool in confined mounting locations.

8 to 16V unregulated power supply operation: Reliable across the variable voltage conditions of powersports applications, battery-only systems, and dual-battery setups.

AUX RCA 2-channel pass-through output: Chain multiple amplifiers from a single source input for multi-zone marine, UTV, or 4WD builds without a signal splitter.

Remote bass control knob with mute (rear channels): Real-time subwoofer level adjustment and mute without accessing the head unit.

350W RMS bridged output on rear channels at 4 Ohm: Rear channel pair bridges to drive a subwoofer or high-power speaker pair.

Compact 215 x 130 x 41mm footprint: Fits under seats, in storage cavities, and in tight enclosures where full-size amplifiers will not.

Removable diecast mounting feet and endcaps: Flexible mounting options for tight or unconventional installation locations.

What's in the box

• SPX700X4 Amplifier
• Remote Bass Control Knob with Mute
• Installation Manual

Technical specs

Frequently asked questions

What is the SPX700X4 rated power output? The SPX700X4 delivers 125W RMS x 4 at 4 Ohm, or 175W RMS x 4 at 2 Ohm, measured at 14.4V. The rear channels can be bridged to 350W RMS at 4 Ohm, giving a total system rating of 700W RMS.

Is the SPX700X4 suitable for marine and wet environments? Yes. The SPX700X4 carries an IPX-4/5 weather-resistance rating and features a weather-resistant PCB, making it suitable for marine, ATV, motorcycle, and off-road environments where moisture and splash exposure are expected.

Can the SPX700X4 run on a battery without a regulated power supply? Yes. The SPX700X4 uses an unregulated power supply design and operates from 8 to 16V, making it compatible with battery-only systems and applications where voltage may vary outside the regulated 13.8V range of a standard car electrical system.

How do I connect multiple SPX700X4 amplifiers to one audio source? The SPX700X4 includes a 2-channel AUX RCA pass-through output. Connect the source signal to the first amplifier's RCA input, then run the pass-through output to the next amplifier's input, allowing a single head unit or source to drive multiple amplifiers without a signal splitter.

Can I bridge the SPX700X4 for subwoofer use? Yes. The rear channels can be bridged to deliver 350W RMS at 4 Ohm for driving a subwoofer or high-power speaker pair. Bridging applies to rear channels only, and a minimum 4 Ohm load is required when bridged.