Rockford Fosgate M5-800X4 800 Watt 4-Channel Element Ready™ Amplifier
Rockford Fosgate M5-800X4 800 Watt 4-Channel IPX6 Element Ready Marine Amplifier
A marine grade 800W 4-channel Class-AD amplifier with IPX6 water intrusion rating, delivering 100W x 4 at 4-ohm (CTA-2006 rated). Features C.L.E.A.N. gain calibration, NOMAD speaker protection, P.O.W.E.R. supply technology, MEHSA4 heat management, Punch EQ2 onboard equaliser, and balanced differential inputs. Bridgeable to 2-channel for 200W x 2 at 4-ohm. Engineered in the USA. Backed by a 1 year warranty.
Product Overview
The Rockford Fosgate M5-800X4 is an 800W 4-channel Class-AD marine amplifier purpose-built for demanding outdoor environments. IPX6 rated and fully Element Ready, it is protected against dust, UV radiation, temperature extremes, water jets from any direction, corrosion, and vibration throughout its service life.
Rated power is 100W x 4 at 4-ohm or 2-ohm, and 200W x 2 at 4-ohm bridged, all at less than 1.0% THD+N and CTA-2006 certified - confirming these are real power numbers, not inflated marketing figures. Dynamic power via PVC/PowerCube reaches 125W x 4 at 4-ohm, 200W x 4 at 2-ohm, and 400W x 2 at 4-ohm bridged. The P.O.W.E.R. supply continues to generate above rated power as voltage increases, and the Constant Power circuit topology delivers instantaneous output across varying impedance loads. Class-AD topology improves efficiency and reduces current draw from the vehicle or vessel charging system.
C.L.E.A.N. (Calibrated Level Eliminates Audible Noise) input and output clip indicators guide precise gain calibration at setup. NOMAD real-time protection guards against shorted speaker wires and dangerously low impedances. MEHSA4 (Maximum Efficiency Heat Sink Application) reduces MOSFET temperatures, lowers distortion, and extends output device life. DSM discrete surface mount components use 1% tight-tolerance parts to improve circuit efficiency, reduce cross-talk, and lower operating temperatures. Balanced differential inputs eliminate noise picked up by signal cables. Punch EQ2 provides up to 18dB of boost at 45Hz and up to 12dB at 12.5kHz for onboard tone shaping.
Features & Benefits
C.L.E.A.N. Technology - Precision Gain Calibration: C.L.E.A.N. (Calibrated Level Eliminates Audible Noise) is a patented circuit with dedicated input and output clip indicator LEDs, making it straightforward to match the source unit output to the amplifier's input sensitivity for optimal, distortion-free performance.
P.O.W.E.R. Supply - More Output as Voltage Rises: The P.O.W.E.R. supply is a unique power supply circuit design that continues to generate above rated output power as supply voltage increases, ensuring the amplifier delivers the output you need even under demanding conditions.
NOMAD Speaker Protection - Real-Time Monitoring: NOMAD is a real-time analog protection circuit that continuously monitors for shorted speaker wires and dangerously low speaker impedances, protecting both the amplifier and connected speakers from damage without requiring manual intervention.
MEHSA4 Heat Management - Lower Temperatures, Longer Life: MEHSA4 (Maximum Efficiency Heat Sink Application) reduces MOSFET operating temperatures, lowers distortion at higher output levels, increases overall amplifier durability, and prolongs the life of the output devices over time.
Punch EQ2 Onboard Equaliser: The Punch EQ2 provides up to 18dB of bass boost at 45Hz for the front and rear channels, and up to 14dB of high-frequency boost at 12.5kHz, enabling onboard tone shaping without a separate equaliser or DSP.
IPX6 Element Ready - Built for Marine and Outdoor Environments: IPX6 water intrusion rating confirms protection against powerful jets of water from any direction. Element Ready construction protects all components against dust, UV radiation, corrosion, temperature extremes, and vibration throughout the service life of the amplifier.
Balanced Differential Inputs: Balanced differential inputs reject noise picked up by signal cables, ensuring a clean signal from source to speaker even in electrically noisy marine or powersports environments.
Technical Specs
| Specification | Detail |
|---|---|
| SKU | M5-800X4 |
| Number of Channels | 4 |
| Total Power | 800W |
| Rated Power (CTA-2006, less than 1.0% THD+N) | 100W x 4 at 4-ohm |
| 100W x 4 at 2-ohm | |
| 200W x 2 at 4-ohm Bridged | |
| Dynamic Power (CTA-2006 PVC/PowerCube) | 125W x 4 at 4-ohm |
| 200W x 4 at 2-ohm | |
| 400W x 2 at 4-ohm Bridged | |
| Circuit Topology | Class-AD |
| Bridgeable | Yes |
| Frequency Response | 10 Hz - 50 kHz |
| THD + Noise | Less than 0.25% at 1 Watt |
| Input Sensitivity | 150mVrms - 12Vrms |
| Efficiency | Greater than 75% |
| Signal Input | Low-Level: 4 x RCA / High-Level: (2) 4-Pin Molex |
| Tone Controls | Front/Rear: 0-18dB at 45Hz / 0-14dB at 12.5kHz |
| High-Pass Crossover | 50 Hz - 250 Hz at 12dB/Octave Butterworth |
| Low-Pass Crossover | 50 Hz - 250 Hz at 12dB/Octave Butterworth |
| All-Pass | Yes |
| Power Wire Gauge | 8 AWG |
| Power Input Connector | Compression Terminal Block |
| Speaker Wire Gauge | 16 AWG |
| Speaker Output Connector | 4-Pin Molex |
| Cooling | Convection |
| Heatsink | Extruded Aluminium |
| Operating Voltage | 9 - 16 VDC |
| Recommended Fuse (not included) | 80A MAXI (Littelfuse 0299080) |
| Average Current Draw at 13.8V Music | 4-ohm Stereo: 29A / 2-ohm Stereo: 29A / 4-ohm Bridged: 29A |
| Max Current Draw at 13.8V Sinewave | 4-ohm Stereo: 55A / 2-ohm Stereo: 85A / 4-ohm Bridged: 90A |
| Water Intrusion Rating | IPX6 |
| Visual Indicators | Power: Blue / Protect: Red / Input Clip: Red / Output Clip: Blue/Red |
| Dimensions (H x W x D) | 42.8 x 108 x 213mm (1.7 x 4.25 x 8.41 inch) |
| Shipping Weight | 1.9kg |
| CTA-2006 Compliant | Yes |
| Warranty | 1 Year |
Compatible With / Goes Well With
The M5-800X4 suits marine watercraft, pontoon boats, wakeboard boats, and powersports vehicles requiring a compact, high-performance 4-channel marine amplifier. It is the recommended amplifier pairing for Rockford Fosgate marine speaker kits including the HD9813RG-STG3 and HD9813SG-STAGE2 Harley-Davidson audio kits, as well as standalone marine speaker installations.
Goes Well With:
- M2WL-8 / M2WL-8B - Rockford Fosgate M2 series 8 inch wake tower speakers, a direct application pairing for the M5-800X4 in marine builds
- TMS6RG / TMS6SG / TMS65 - Rockford Fosgate Element Ready marine and motorcycle fairing speakers driven by the M5-800X4 in HD kit applications
- M210S4B / M212S4 - M2 marine subwoofers for full system builds pairing the M5-800X4 with a dedicated marine sub
- DSR1 - Rockford Fosgate Digital Signal Processor for advanced signal tuning ahead of the M5-800X4
- RFW4R / RFW4B - Rockford Fosgate 4 AWG marine amplifier wiring kits (red or black) to complete the installation
Frequently Asked Questions
What is C.L.E.A.N. and how does it help with setup?
C.L.E.A.N. (Calibrated Level Eliminates Audible Noise) is a patented Rockford Fosgate circuit that uses dedicated input and output clip indicator LEDs to guide amplifier gain calibration. By raising the source unit volume until the input clip LED activates, then adjusting the amplifier gain until the output clip LED just extinguishes, the M5-800X4 can be precisely matched to the source unit for maximum output with minimum distortion - without needing test equipment.
What is the difference between rated power and dynamic power on the M5-800X4?
Rated power is measured under CTA-2006 continuous conditions at less than 1.0% THD+N - these are conservative, real-world figures. Dynamic power figures (via PVC/PowerCube) reflect the amplifier's peak output capability during transient musical peaks, which is higher than the continuous rating. Both sets of figures are CTA-2006 documented and reflect actual measured performance, not inflated marketing claims.
Is the M5-800X4 suitable for saltwater marine environments?
Yes. The M5-800X4 carries IPX6 water intrusion rating and full Element Ready certification, protecting it against water jets from any direction, UV radiation, corrosion, dust, vibration, and temperature extremes. It is designed for both freshwater and saltwater marine applications.
Can the M5-800X4 be used to power a subwoofer?
Yes. The M5-800X4 is bridgeable to 2-channel, delivering 200W x 2 at 4-ohm bridged (or 400W dynamic). Two channels can be bridged to drive a single subwoofer while the remaining two channels power full-range speakers. The onboard low-pass crossover (50-250Hz at 12dB/octave) can be applied to the bridged subwoofer channel for a clean filtered bass signal.
What fuse is required for the M5-800X4 and is it included?
The M5-800X4 requires an 80A MAXI fuse (Littelfuse part number 0299080). The fuse is not included in the box and must be sourced separately. It is recommended to install this fuse as close to the battery as possible in the power supply line.
Original: $888.50
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$310.97Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
Rockford Fosgate M5-800X4 800 Watt 4-Channel IPX6 Element Ready Marine Amplifier
A marine grade 800W 4-channel Class-AD amplifier with IPX6 water intrusion rating, delivering 100W x 4 at 4-ohm (CTA-2006 rated). Features C.L.E.A.N. gain calibration, NOMAD speaker protection, P.O.W.E.R. supply technology, MEHSA4 heat management, Punch EQ2 onboard equaliser, and balanced differential inputs. Bridgeable to 2-channel for 200W x 2 at 4-ohm. Engineered in the USA. Backed by a 1 year warranty.
Product Overview
The Rockford Fosgate M5-800X4 is an 800W 4-channel Class-AD marine amplifier purpose-built for demanding outdoor environments. IPX6 rated and fully Element Ready, it is protected against dust, UV radiation, temperature extremes, water jets from any direction, corrosion, and vibration throughout its service life.
Rated power is 100W x 4 at 4-ohm or 2-ohm, and 200W x 2 at 4-ohm bridged, all at less than 1.0% THD+N and CTA-2006 certified - confirming these are real power numbers, not inflated marketing figures. Dynamic power via PVC/PowerCube reaches 125W x 4 at 4-ohm, 200W x 4 at 2-ohm, and 400W x 2 at 4-ohm bridged. The P.O.W.E.R. supply continues to generate above rated power as voltage increases, and the Constant Power circuit topology delivers instantaneous output across varying impedance loads. Class-AD topology improves efficiency and reduces current draw from the vehicle or vessel charging system.
C.L.E.A.N. (Calibrated Level Eliminates Audible Noise) input and output clip indicators guide precise gain calibration at setup. NOMAD real-time protection guards against shorted speaker wires and dangerously low impedances. MEHSA4 (Maximum Efficiency Heat Sink Application) reduces MOSFET temperatures, lowers distortion, and extends output device life. DSM discrete surface mount components use 1% tight-tolerance parts to improve circuit efficiency, reduce cross-talk, and lower operating temperatures. Balanced differential inputs eliminate noise picked up by signal cables. Punch EQ2 provides up to 18dB of boost at 45Hz and up to 12dB at 12.5kHz for onboard tone shaping.
Features & Benefits
C.L.E.A.N. Technology - Precision Gain Calibration: C.L.E.A.N. (Calibrated Level Eliminates Audible Noise) is a patented circuit with dedicated input and output clip indicator LEDs, making it straightforward to match the source unit output to the amplifier's input sensitivity for optimal, distortion-free performance.
P.O.W.E.R. Supply - More Output as Voltage Rises: The P.O.W.E.R. supply is a unique power supply circuit design that continues to generate above rated output power as supply voltage increases, ensuring the amplifier delivers the output you need even under demanding conditions.
NOMAD Speaker Protection - Real-Time Monitoring: NOMAD is a real-time analog protection circuit that continuously monitors for shorted speaker wires and dangerously low speaker impedances, protecting both the amplifier and connected speakers from damage without requiring manual intervention.
MEHSA4 Heat Management - Lower Temperatures, Longer Life: MEHSA4 (Maximum Efficiency Heat Sink Application) reduces MOSFET operating temperatures, lowers distortion at higher output levels, increases overall amplifier durability, and prolongs the life of the output devices over time.
Punch EQ2 Onboard Equaliser: The Punch EQ2 provides up to 18dB of bass boost at 45Hz for the front and rear channels, and up to 14dB of high-frequency boost at 12.5kHz, enabling onboard tone shaping without a separate equaliser or DSP.
IPX6 Element Ready - Built for Marine and Outdoor Environments: IPX6 water intrusion rating confirms protection against powerful jets of water from any direction. Element Ready construction protects all components against dust, UV radiation, corrosion, temperature extremes, and vibration throughout the service life of the amplifier.
Balanced Differential Inputs: Balanced differential inputs reject noise picked up by signal cables, ensuring a clean signal from source to speaker even in electrically noisy marine or powersports environments.
Technical Specs
| Specification | Detail |
|---|---|
| SKU | M5-800X4 |
| Number of Channels | 4 |
| Total Power | 800W |
| Rated Power (CTA-2006, less than 1.0% THD+N) | 100W x 4 at 4-ohm |
| 100W x 4 at 2-ohm | |
| 200W x 2 at 4-ohm Bridged | |
| Dynamic Power (CTA-2006 PVC/PowerCube) | 125W x 4 at 4-ohm |
| 200W x 4 at 2-ohm | |
| 400W x 2 at 4-ohm Bridged | |
| Circuit Topology | Class-AD |
| Bridgeable | Yes |
| Frequency Response | 10 Hz - 50 kHz |
| THD + Noise | Less than 0.25% at 1 Watt |
| Input Sensitivity | 150mVrms - 12Vrms |
| Efficiency | Greater than 75% |
| Signal Input | Low-Level: 4 x RCA / High-Level: (2) 4-Pin Molex |
| Tone Controls | Front/Rear: 0-18dB at 45Hz / 0-14dB at 12.5kHz |
| High-Pass Crossover | 50 Hz - 250 Hz at 12dB/Octave Butterworth |
| Low-Pass Crossover | 50 Hz - 250 Hz at 12dB/Octave Butterworth |
| All-Pass | Yes |
| Power Wire Gauge | 8 AWG |
| Power Input Connector | Compression Terminal Block |
| Speaker Wire Gauge | 16 AWG |
| Speaker Output Connector | 4-Pin Molex |
| Cooling | Convection |
| Heatsink | Extruded Aluminium |
| Operating Voltage | 9 - 16 VDC |
| Recommended Fuse (not included) | 80A MAXI (Littelfuse 0299080) |
| Average Current Draw at 13.8V Music | 4-ohm Stereo: 29A / 2-ohm Stereo: 29A / 4-ohm Bridged: 29A |
| Max Current Draw at 13.8V Sinewave | 4-ohm Stereo: 55A / 2-ohm Stereo: 85A / 4-ohm Bridged: 90A |
| Water Intrusion Rating | IPX6 |
| Visual Indicators | Power: Blue / Protect: Red / Input Clip: Red / Output Clip: Blue/Red |
| Dimensions (H x W x D) | 42.8 x 108 x 213mm (1.7 x 4.25 x 8.41 inch) |
| Shipping Weight | 1.9kg |
| CTA-2006 Compliant | Yes |
| Warranty | 1 Year |
Compatible With / Goes Well With
The M5-800X4 suits marine watercraft, pontoon boats, wakeboard boats, and powersports vehicles requiring a compact, high-performance 4-channel marine amplifier. It is the recommended amplifier pairing for Rockford Fosgate marine speaker kits including the HD9813RG-STG3 and HD9813SG-STAGE2 Harley-Davidson audio kits, as well as standalone marine speaker installations.
Goes Well With:
- M2WL-8 / M2WL-8B - Rockford Fosgate M2 series 8 inch wake tower speakers, a direct application pairing for the M5-800X4 in marine builds
- TMS6RG / TMS6SG / TMS65 - Rockford Fosgate Element Ready marine and motorcycle fairing speakers driven by the M5-800X4 in HD kit applications
- M210S4B / M212S4 - M2 marine subwoofers for full system builds pairing the M5-800X4 with a dedicated marine sub
- DSR1 - Rockford Fosgate Digital Signal Processor for advanced signal tuning ahead of the M5-800X4
- RFW4R / RFW4B - Rockford Fosgate 4 AWG marine amplifier wiring kits (red or black) to complete the installation
Frequently Asked Questions
What is C.L.E.A.N. and how does it help with setup?
C.L.E.A.N. (Calibrated Level Eliminates Audible Noise) is a patented Rockford Fosgate circuit that uses dedicated input and output clip indicator LEDs to guide amplifier gain calibration. By raising the source unit volume until the input clip LED activates, then adjusting the amplifier gain until the output clip LED just extinguishes, the M5-800X4 can be precisely matched to the source unit for maximum output with minimum distortion - without needing test equipment.
What is the difference between rated power and dynamic power on the M5-800X4?
Rated power is measured under CTA-2006 continuous conditions at less than 1.0% THD+N - these are conservative, real-world figures. Dynamic power figures (via PVC/PowerCube) reflect the amplifier's peak output capability during transient musical peaks, which is higher than the continuous rating. Both sets of figures are CTA-2006 documented and reflect actual measured performance, not inflated marketing claims.
Is the M5-800X4 suitable for saltwater marine environments?
Yes. The M5-800X4 carries IPX6 water intrusion rating and full Element Ready certification, protecting it against water jets from any direction, UV radiation, corrosion, dust, vibration, and temperature extremes. It is designed for both freshwater and saltwater marine applications.
Can the M5-800X4 be used to power a subwoofer?
Yes. The M5-800X4 is bridgeable to 2-channel, delivering 200W x 2 at 4-ohm bridged (or 400W dynamic). Two channels can be bridged to drive a single subwoofer while the remaining two channels power full-range speakers. The onboard low-pass crossover (50-250Hz at 12dB/octave) can be applied to the bridged subwoofer channel for a clean filtered bass signal.
What fuse is required for the M5-800X4 and is it included?
The M5-800X4 requires an 80A MAXI fuse (Littelfuse part number 0299080). The fuse is not included in the box and must be sourced separately. It is recommended to install this fuse as close to the battery as possible in the power supply line.
