Description
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: <1%
- Damping factor: >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
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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.
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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.
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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.
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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.
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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.
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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.
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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 |
<1% |
| Damping Factor |
>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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