Description
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
| Specification |
Detail |
| SKU |
SPX700X4 |
| Brand |
Stinger |
| Configuration |
4-channel, full range Class D |
| RMS Power at 4 Ohm (14.4V) |
125W x 4 |
| RMS Power at 2 Ohm (14.4V) |
175W x 4 |
| Bridged Power at 4 Ohm (rear channels) |
350W RMS |
| Total Rated Power |
700W RMS |
| Weather Resistance |
IPX-4/5 |
| Weather-Resistant PCB |
Yes |
| Operating Voltage |
8 to 16V |
| Input Sensitivity |
200mV to 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 |
12dB/octave Linkwitz-Riley, 40Hz to 400Hz |
| Frequency Response |
20Hz to 20kHz |
| Signal-to-Noise Ratio |
Over 100dB (CEA standard) |
| THD+N |
Less than 1% |
| Damping Factor |
Over 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 |
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.
Legendary Products & Support From Authorized Dealers
When you choose Frankies BrandBeast, you're choosing quality and performance. But just as important as what you buy is where you buy it from. Here's why purchasing from an authorized dealer is always the right choice:
▸ Expert Knowledge & Training
Only authorized Frankies BrandBeast dealers are factory-trained to sell and install our products. They have the expertise to ensure your purchase is set up correctly and meets your expectations.
▸ Authorized Warranty Protection
We offer one of the best warranties in the industry, but only purchases made through authorized dealers are covered. Don’t be misled by unauthorized sellers who can’t provide genuine warranty support.
▸ Reliable Customer Support
If you ever run into an issue, you’re backed by Frankies BrandBeast’s official manufacturer’s warranty. No need to deal with overseas returns, our local team takes care of everything quickly and efficiently.
▸ Protect Your Investment
Buying from an authorized dealer ensures you’re getting genuine products, full warranty coverage, and expert support. Ask yourself, is saving a few bucks worth losing all that?
Choose wisely. Buy from Frankies BrandBeast today!
