Rockford Fosgate M5-800X4 M5 Series 4-Channel 100W RMS x 4 at 2-Ohms, Class-AD Marine/Powersports Car Amplifier
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What's Inside?
- • 4-Channel Class-AD Marine/Powersports Amplifier
- • 11" Power/ground/turn-on & speaker output harness (installed on amp)
- • 11" Input harness (installed on amp)
- • (2) 14" RCA-to-Molex input adapters
- • Power/ground/turn-on adapter plug
- • (2) 7.5" speaker output harnesses
- • 3mm Allen key
- • Performance certificate
- • Contact information
- • Owner's Manual
Powerful Performance and Built for the Trail
Play longer with extended runtime and seamless integration, enjoy instant sound optimization with PRESET tuning, and experience rugged Element Ready™ protection that thrives in mud, water, and dust. With Constant Power™ delivering up to 25% more output, RATS-certified reliability, and C.L.E.A.N. setup for precise tuning, this system gives you unmatched power, durability, and sound quality—no matter where the ride takes you.
Precision Power and Engineered for Excellence
Enjoy high-efficiency performance with Surface-Mount Precision for clean, accurate sound, while Class-AD technology delivers more power with less current draw. Designed for seamless integration with OEM or aftermarket systems, this amp features top-mounted Element Ready™ controls under a protective smoked lens, plus rugged MESHA 4 Armor to reduce heat, minimize distortion, and ensure long-lasting reliability on every adventure.
Quiet Power and Built for Extreme Conditions
Experience crystal-clear sound with noise-free performance thanks to chassis isolation and balanced differential inputs. Smart Remote-Out provides flexible system control, while low impedance stability guarantees consistent output under heavy loads. The focused-mass heat sink targets hot spots for superior cooling, keeping your system performing at its peak on every ride.
Frequently Asked Questions (FAQ)
- • Why did my speakers lose sound after I added the M5-800X4?
A real Harley owner experienced almost complete audio loss after adding an M5-800X4 to an existing Rockford system. Rockford Fosgate confirmed that the amplifier was not compatible with that particular factory setup, showing why amplifier compatibility should be verified before connecting it.
- • Why does the M5-800X4 get noticeably warm during long listening sessions?
Heat is a common concern with compact high-power amplifiers. The M5-800X4 uses a substantial aluminum heatsink and performed for more than 40 minutes at high output in laboratory testing without thermal shutdown, but restricted airflow can still make any installation run hotter.
- • Why does my amplifier work perfectly on four speakers but not after adding more?
The M5-800X4 has four amplifier channels, and the correct speaker load and system configuration are important. A documented Rockford support response specifically warned that adding speakers beyond the supported configuration of a factory Harley system caused audio problems.
- • Why is setting up the M5-800X4 confusing when using only two channels?
Some users have found the manual's 2-channel configuration and wiring instructions difficult to follow. One customer reported needing Rockford technical support to clarify the correct setup, although the issue was resolved quickly.
- • Why does the M5-800X4 sound weak when I bridge channels for a subwoofer?
Bridging changes the amplifier's available output and channel configuration. The M5-800X4 can deliver about 200 watts into a 4-ohm bridged load, but the connected subwoofer must have the appropriate impedance and the crossover must be configured correctly.
- • Why does my amplifier shut down when the system gets pushed hard?
Thermal protection or an unsuitable speaker load can cause an amplifier to stop operating. Independent testing found the M5-800X4 had excellent thermal stability, but an installation with poor ventilation or an incorrect impedance can still create protection problems.
- • Why am I hearing noise after connecting the M5-800X4 to my factory radio?
The amplifier is designed to accept factory-level signals and uses balanced differential inputs, which helps with common noise problems. However, poor grounding, incorrect signal routing, or unsuitable factory-system integration can still create unwanted noise.
- • Why do I need to be careful about the amplifier's fuse size?
Rockford specifies an 80-amp fuse for the M5-800X4 and requires the main power cable to be fused within 18 inches of the battery. Using the wrong fuse arrangement can create a serious electrical and safety problem.
- • Why is the amplifier difficult to wire in a tight installation?
The compact housing makes the M5-800X4 useful for motorcycles and UTVs, but the terminal block and multiple water-resistant connectors can make wiring awkward when access is limited. Its 1.7-inch height helps with clearance, while the harness system simplifies connections once there is enough working room.
- • Why does the M5-800X4 sound good even with a relatively small physical size?
The amplifier uses a compact Class-AD design with efficient thermal management. Independent testing found it exceeded its rated output, producing 130.4 watts per channel at 4 ohms and 150.5 watts at 2 ohms under standardized testing, while maintaining clean output.
- Maximum Power : 800 Watts
- Low Frequency Response : 50-250 Hz
- High Frequency Response : 50-250 Hz
- Number of Channels : 4
- Frequency Response : 10-50000 Hz
- Built In Crossovers : Yes
- RMS Power Output : 4x100 Watts
- Amplifier Class : AD
- Fuse Rating : 100 A
Features:
- Play All Day: Designed for easy integration and extended playtime, keeping your music going longer.
- Preset Perfection: PRESET feature eliminates manual tuning when paired with Rockford Fosgate UTV audio kits.
- Element Ready™ Protection: Integrated harness and panel seals built for off-road durability.
- Constant Power™ Advantage: Patented technology delivers up to 25% more power across varying impedance loads.
- RATS Certified: Rockford Automated Testing System ensures top-tier quality and performance.
- C.L.E.A.N. Setup: Input/output clip detection with indicator LEDs for precise tuning.
- Surface-Mount Precision: Discrete SMD design with 1% tolerances for high efficiency and minimal cross-talk.
- Class-AD Power: Proprietary design produces more power with less current draw.
- Seamless Integration: Compatible with both OEM and aftermarket radio inputs.
- Top-Mounted Controls: Element Ready™ smoked lens cover protects the control panel.
- MESHA 4 Armor: Reduces MOSFET temperatures, lowers distortion, and extends device life.
- Noise-Free Performance: Chassis isolation minimizes vehicle noise interference.
- Smart Remote-Out: Activates when using high-level inputs for flexible system control.
- Balanced Differential Inputs: Eliminates noise caused by signal cables.
- Low Impedance Stability: Ensures consistent performance under demanding loads.
- Focused Mass Heat Sink: Strategically placed aluminum around hot spots for efficient cooling.
Specifications:
- 100W x 4 RMS Power
- 125W x 4 Peak Power
- 100W x 4 @ 2Ω
- 200W x 2 Bridged
- Frequency Response: 20Hz – 20kHz
- THD: 0.25%
- Signal-to-Noise: 105 dB
- Low-Pass: 50–250Hz (12 dB/octave)
- High-Pass: 50–250Hz (12 dB/octave)
- Bass Boost: 0–18 dB @ 45Hz
- Class A/D Amplifier
- Size: 1-13/16" H x 12" W x 4-1/4" D
- Fan Cooled: No
- Speaker-Level Inputs: Yes
- Preamp Outputs: No
- Fuse Rating: 100A
- Min Impedance: 2Ω (Unbridged), 4Ω (Bridged)
- UPC: 780687357962
- Weight: 6
- Authorized Internet Dealer
Warranty: 2 Year(s) Warranty.
This item is accompanied by a manufacturer's warranty. If it is found to be defective, it may be returned to OnlineCarstereo.com for replacement within 2 Year(s) from the original date of purchase with proper return authorization.
