Built for Where Normal Amps Won't Last 700W 4-Channel Power for Marine, ATV, UTV, Motorcycle & 4WD Product Overview The Stinger SPX700X4 is a 4-channel Class D powersports amplifier designed for the demanding environments that standard car amplifiers simply aren't built to handle. With an IPX-4/5 weather-resistant rating, weather-resistant PCB, and a compact low-profile diecast chassis, it's engineered for use in marine, ATV, UTV, motorcycle, off-road vehicle, and mobile power applications where moisture, dust, vibration, and non-standard voltage are all part of daily operation. Rated at 125W RMS x 4 at 4Ω (175W RMS x 4 at 2Ω, 350W RMS bridged on rear channels) from a 14.4V supply, the SPX700X4 delivers usable full-range power in a compact 215 x 130 x 41mm footprint. An unregulated power supply design allows operation from 8–16V, accommodating the variable voltage conditions common in powersports and off-grid applications. An AUX RCA pass-through output allows multiple amplifiers to be chained from a single audio source, and a remote subwoofer volume control knob with mute function is included for rear channel subwoofer management. Key Specifications Manufacturer Part Number: SPX700X4 Configuration: 4-channel Class D (Full Range) RMS Power @ 14.4V: 125W x 4 (4Ω) / 175W x 4 (2Ω) / 350W bridged (rear channels, 4Ω) Total rated power: 700W RMS Weather resistance: IPX-4/5 Operating voltage: 8–16V (unregulated power supply) Input: 4-channel balanced RCA, 200mV–12V RMS Preamp output: 2-channel pass-through (AUX RCA) Power/ground wire gauge: 8 AWG Recommended fuse: 3A Crossover: 12 dB/octave Linkwitz-Riley, 40Hz–400Hz Frequency response: 20Hz–20kHz Signal-to-noise ratio: >100dB (CEA standard) THD+N: 200 Dimensions: 215mm (L) x 130mm (W) x 41mm (H) Subwoofer volume control with mute: Yes — rear channels only Mounting feet: Removable (diecast endcaps) Features & Benefits IPX-4/5 Weather-Resistant Design — Splash and moisture protection rated to IPX-4/5, with a weather-resistant PCB that resists corrosion and condensation — purpose-built for marine, ATV, motorcycle, and off-road environments where a standard car amplifier would fail. Full Range Class D Performance — D-Class MOSFETs deliver efficient, full-range amplification across 20Hz–20kHz, keeping the SPX700X4 cool and power-efficient in confined mounting locations. Unregulated Power Supply — 8–16V Operation — Designed to work reliably across the variable voltage range common in powersports applications, including battery-only systems, dual-battery setups, and systems without a regulated supply. AUX RCA Pass-Through Output — A 2-channel pass-through RCA output allows multiple SPX700X4 amplifiers to be chained from a single source input — ideal for multi-zone setups on larger boats, UTVs, or custom 4WD builds. Subwoofer Volume Control with Mute — The included remote bass control knob allows real-time subwoofer level adjustment and mute control for the rear channels, without returning to the head unit. Compact Low-Profile Footprint — At 215 x 130 x 41mm with removable mounting feet and diecast endcaps, the SPX700X4 fits under seats, in storage cavities, and in tight enclosures where full-size amplifiers won't. 350W Bridged Output (Rear Channels) — The rear channel pair can be bridged to deliver 350W RMS at 4Ω, driving a subwoofer or a high-power speaker pair from the one amplifier. Technical Specs Specification Detail Part Number SPX700X4 Brand Stinger Configuration 4-channel, Full Range Class D RMS Power @ 4Ω (14.4V) 125W x 4 RMS Power @ 2Ω (14.4V) 175W x 4 Bridged Power @ 4Ω (Rear Channels) 350W RMS Total Rated Power 700W RMS Weather Resistance IPX-4/5 Operating Voltage 8–16V Input Sensitivity 200mV–12V RMS (balanced RCA) Input Channels 4-channel balanced RCA Preamp Output 2-channel pass-through RCA Power/Ground Wire Gauge 8 AWG Recommended Fuse 3A Crossover 12 dB/octave Linkwitz-Riley, 40Hz–400Hz Frequency Response 20Hz–20kHz Signal-to-Noise Ratio >100dB (CEA standard) THD+N 200 Dimensions (L x W x H) 215mm x 130mm x 41mm Subwoofer Volume Control Yes — rear channels only, with mute Mounting Feet Removable (diecast endcaps) Included Amplifier, bass control knob, manual Compatible With / Goes Well With Marine vessels, boats, and watercraft ATVs, UTVs, and off-road vehicles Motorcycles and powersports applications 4WD and overland vehicle builds 4-channel speaker setups (full-range, front/rear configuration) Subwoofer + speaker configurations (bridge rear channels to subwoofer) Multi-amplifier setups via AUX RCA pass-through Battery and dual-battery systems operating at 8–16V Frequently Asked Questions What is the SPX700X4 rated power output? The SPX700X4 delivers 125W RMS x 4 at 4Ω, or 175W RMS x 4 at 2Ω, measured at 14.4V. The rear channels can be bridged to 350W RMS at 4Ω, 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 is rated to operate from 8 to 16 volts, 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 4Ω, making them suitable for driving a subwoofer or high-power speaker pair. Note: bridging applies to rear channels only, and a minimum 4Ω load is required when bridged.
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