Rockford Fosgate M2-500X1 M2 500 Watt Mono Element Ready™ Amplifier

Rockford Fosgate M2-500X1 M2 Series 500 Watt Mono Class-D Element Ready Marine Amplifier

A marine grade 500W mono Class-D subwoofer amplifier delivering 500W x 1 at 2-ohm (CTA-2006 rated). Features C.L.E.A.N. gain calibration, continuously variable Punch EQ with up to 18dB of bass boost at 45Hz, variable infrasonic filter, RCA pass-thru outputs, RLC remote level control, NOMAD speaker protection, Rollback Protection, conformal coated circuit board, and UV stable powder coated cast aluminium heatsink. Backed by a 2 year warranty.

Product Overview

The Rockford Fosgate M2-500X1 is a 500W mono Class-D marine amplifier from the M2 Element Ready series, designed for those who want reliable Rockford Fosgate performance in the marine environment at an accessible price point. Rated continuous power is 300W x 1 at 4-ohm and 500W x 1 at 2-ohm (CTA-2006, less than 1.0% THD+N). Dynamic power via PowerCube reaches 350W at 4-ohm and 590W at 2-ohm.

As a dedicated mono subwoofer amplifier, the M2-500X1 operates across a frequency range of 20Hz-250Hz. The circuit board is conformal coated to protect electronics from dust and water, and the UV stable powder coated cast aluminium heatsink provides protection against the marine environment without requiring a full IP-rated enclosure. Zinc nickel-plated marine grade brass connection terminals resist corrosion at the connection points.

The continuously variable onboard Punch EQ delivers up to 18dB of boost at 45Hz for added bass output from the subwoofer. The variable infrasonic filter is tunable from 15Hz to 40Hz at 12dB/octave, protecting subwoofer drivers across a wider range than a fixed infrasonic filter. RCA pass-thru outputs allow downstream amplifier chaining. An RLC remote level control is included for in-cabin volume adjustment without returning to the amplifier. Auto-Sense turn-on via high-level input removes the need for a dedicated remote wire, with a bypass switch available for vehicles with Retained Accessory Power (RAP) systems. The M2-500X1 is optimised using the AudioGraph PowerCube measurement tool and RATS tested for quality and performance. MEHSA4 heat management, NOMAD speaker protection, and Rollback Protection are all applied.

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Features & Benefits

Class-D Mono - Efficient Power Delivery for Subwoofers: The M2-500X1 uses Class-D topology, which is highly efficient at reducing current demand on the vessel's electrical system compared to traditional Class-A/B designs, while delivering 500W RMS at 2-ohm to a marine subwoofer.

Continuously Variable Punch EQ - Up to 18dB at 45Hz: The onboard Punch EQ provides up to 18dB of continuously adjustable bass boost at 45Hz, allowing the subwoofer output to be tuned precisely to the acoustic characteristics of the installation without a separate equaliser or DSP.

Variable Infrasonic Filter - 15Hz to 40Hz Tunable: The infrasonic filter is tunable from 15Hz to 40Hz (12dB/octave Butterworth), providing a wider adjustment range than a fixed infrasonic filter and allowing precise protection for different subwoofer drivers and enclosure types.

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, enabling precise gain calibration at setup to maximise output while minimising distortion.

RLC Remote Level Control Included: An RLC remote level control is included in the box, allowing subwoofer output volume to be adjusted from the helm or seating position without returning to the amplifier mounting location.

RCA Pass-Thru Outputs for Downstream Chaining: RCA pass-thru outputs are active with both RCA and high-level input, allowing the signal to be passed to an additional amplifier in the system without signal degradation.

Rollback Protection - Output Device Preservation: Rollback Protection dynamically reduces amplifier demand during sustained high-output conditions, protecting the output devices from thermal stress without triggering a full protect shutdown.

NOMAD, MEHSA4, and Conformal Coated Circuit Board: NOMAD provides real-time protection against shorted speaker wires and dangerously low impedances. MEHSA4 (Maximum Efficiency Heat Sink Application) reduces MOSFET temperatures and extends device life. The conformal coated circuit board provides protection against dust and water ingress at the PCB level.

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Technical Specs

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Compatible With / Goes Well With

The M2-500X1 is suited to marine watercraft, pontoon boats, and powersports applications requiring a reliable mono subwoofer amplifier at an accessible price point. It is compatible with subwoofers rated for 300-500W RMS at 4-ohm or 2-ohm. For higher output marine mono amplification, refer to the M5-1000X1.

Goes Well With:

• M212S4 - Rockford Fosgate M2 series 12 inch 4-ohm marine subwoofer, a straightforward pairing with the M2-500X1 at 300W RMS rated output at 4-ohm
• M210S4B - M2 series 10 inch 4-ohm marine subwoofer in black for a compact pairing with the M2-500X1
• M2D2-10SB - M2 series 10 inch DVC Color Optix sealed marine subwoofer, compatible via the VersaSwitch 4-ohm series setting
• M5-1000X1 - Higher output M5 series 1000W marine monoblock amplifier for builds requiring more headroom beyond the M2-500X1's 500W capability
• M2-300X4 - Companion M2 series 4-channel amplifier for full system builds pairing the M2-500X1 on subwoofer duty with the M2-300X4 powering full-range speakers
• RFW4R / RFW4B - Rockford Fosgate 4 AWG amplifier wiring kits (red or black) matched to the M2-500X1's 4 AWG power wire requirement

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Frequently Asked Questions

What is the difference between the M2-500X1 and the M5-1000X1?

The M2-500X1 is a 500W mono Class-D marine amplifier from the M2 Element Ready series, rated at 300W at 4-ohm and 500W at 2-ohm. The M5-1000X1 is a 1000W mono Class-BD marine amplifier from the premium M5 series, rated at 500W at 4-ohm, 750W at 2-ohm, and 750W at 1-ohm, with IPX6 water intrusion rating, greater than 80% efficiency, and the PRESET feature for UTV kit compatibility. The M2-500X1 is the more accessible option for builds where 500W output is sufficient; the M5-1000X1 is the step up for higher output requirements and premium marine protection.

What is Rollback Protection and when does it activate?

Rollback Protection is a circuit that dynamically reduces the amplifier's output demand during sustained high-output conditions to prevent thermal stress on the output devices. Unlike a hard protect shutdown, Rollback Protection manages the amplifier's workload in real time, allowing it to continue playing while protecting the internal components from damage during extended periods of high volume.

Does the M2-500X1 need a dedicated remote turn-on wire?

Not necessarily. The M2-500X1 features Auto-Sense turn-on, which activates the amplifier automatically when it detects a high-level (speaker) input signal. This removes the need for a dedicated remote wire when integrating with OEM or aftermarket radios that don't have a separate remote output. An Auto-Sense bypass switch is also included for vessels with Retained Accessory Power (RAP) systems.

Is the variable infrasonic filter adjustable and why does the range matter?

Yes. The infrasonic filter is variable from 15Hz to 40Hz at 12dB/octave. A wider adjustment range gives more flexibility to protect different subwoofer types - drivers with a lower resonant frequency (Fs) benefit from a lower filter setting, while those with a higher Fs are better protected by a higher filter cutoff. This is more versatile than a fixed 30Hz infrasonic filter found on some amplifiers.

What fuse does the M2-500X1 require and is it included?

The M2-500X1 requires an 80A fuse. The fuse is not included in the box and must be sourced separately. Install the fuse as close to the battery as possible in the 4 AWG power supply line to protect the wiring in the event of a short circuit.