Rockford Fosgate R2-500X1 Prime 500 Watt Mono Amplifier
Rockford Fosgate R2-500X1 Prime 500 Watt Mono Class-D Subwoofer Amplifier
A 500W mono Class-D subwoofer amplifier rated at 500W x 1 at 2-ohm and 300W x 1 at 4-ohm (CTA-2006 rated). Features Continuously Variable Punch EQ with up to 18dB of bass boost at 45Hz, variable infrasonic filter, C.L.E.A.N. gain calibration, RCA pass-through outputs, RLC remote level control, Rollback Protection, NOMAD speaker protection, and MEHSA4 heat management. Designed and engineered in Tempe, Arizona. Backed by a 1 year warranty.
Product Overview
The Rockford Fosgate R2-500X1 is a 500W mono Class-D subwoofer amplifier from the Prime R2 series, designed for car audio builds requiring dedicated subwoofer amplification at a strong price-to-performance ratio. As a dedicated single-channel subwoofer amplifier, it operates across a frequency range of 20Hz-250Hz. 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.
Unlike the R2-750X1 which is also 1-ohm stable, the R2-500X1 operates at 4-ohm or 2-ohm only. The Continuously Variable onboard Punch EQ delivers up to 18dB of boost at 45Hz. The variable infrasonic filter is tunable from 15Hz to 40Hz at 12dB/octave, providing flexible protection for different subwoofer drivers and enclosure types. RCA pass-through outputs allow the signal to be chained to a companion speaker amplifier. An RLC remote level control is included for in-cabin subwoofer volume adjustment.
High-level inputs (450mV-12V) allow direct integration with OEM head units without RCA outputs. Auto-Sense turn-on activates the amplifier automatically when a signal is detected, with a bypass switch for vehicles with Retained Accessory Power (RAP) systems. C.L.E.A.N. input and output clip indicators guide precise gain calibration. Rollback Protection, NOMAD speaker protection, and MEHSA4 heat management are all active. Cast aluminium heatsink with convection cooling. Designed and engineered in Tempe, Arizona.
Features & Benefits
500W at 2-Ohm - High Output Mono Subwoofer Performance: The R2-500X1 delivers 500W RMS at 2-ohm (590W dynamic) and 300W RMS at 4-ohm, providing substantial subwoofer output for the Prime R2 price point.
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 subwoofer output to be tuned to the acoustic characteristics of the installation without a separate equaliser.
Variable Infrasonic Filter - 15Hz to 40Hz Tunable: The infrasonic filter is tunable from 15Hz to 40Hz at 12dB/octave, providing flexible and adjustable protection for different subwoofer drivers and enclosure types.
RCA Pass-Through Outputs - Downstream Chaining: RCA pass-through outputs are active with both RCA and high-level input, allowing the signal to be passed to a downstream speaker amplifier such as the R2-500X4 without Y-cable noise or signal degradation.
C.L.E.A.N. Technology - Precise Gain Calibration: C.L.E.A.N. (Calibrated Level Eliminates Audible Noise) provides dedicated input and output clip indicator LEDs for precise gain calibration at setup, maximising output while minimising distortion.
RLC Remote Level Control Included: An RLC remote level control is included for in-cabin subwoofer volume adjustment without returning to the amplifier.
Rollback Protection and NOMAD Speaker Protection: Rollback Protection dynamically manages output during sustained high-output conditions to prevent thermal stress on the output devices. NOMAD provides real-time protection against shorted speaker wires and dangerously low impedances.
Auto-Sense Turn-On with RAP Bypass: Auto-Sense activates the amplifier automatically when a high-level input signal is detected, removing the need for a dedicated remote turn-on wire. A bypass switch is included for vehicles with RAP systems.
Technical Specs
| Specification | Detail |
|---|---|
| SKU | R2-500X1 |
| Number of Channels | 1 (Monoblock) |
| Total Power | 500W |
| Rated Power - 4-ohm (CTA-2006, less than 1.0% THD+N) | 300W x 1 |
| Rated Power - 2-ohm (CTA-2006, less than 1.0% THD+N) | 500W x 1 |
| Dynamic Power - 4-ohm (PowerCube) | 350W x 1 |
| Dynamic Power - 2-ohm (PowerCube) | 590W x 1 |
| Circuit Topology | Class-D |
| Bridgeable | No |
| Frequency Response | 20 Hz - 250 Hz |
| THD + Noise | Less than 1.0% at 4-ohm and 2-ohm |
| Input Sensitivity | Low-Level: 150mV - 4V / High-Level: 450mV - 12V |
| Signal Input | 2 x RCA / 4-Pin Molex High-Level |
| Signal Output | 2 x RCA Pass-Thru (active with RCA or High-Level input) |
| Tone Controls | Punch EQ: 0 to +18dB at 45Hz (Continuously Variable) |
| Low-Pass Crossover | 50 Hz - 250 Hz at 12dB/Octave Butterworth |
| Infrasonic Filter | 15 Hz - 40 Hz at 12dB/Octave Butterworth (Variable) |
| Remote Controls | Yes (RLC Remote Level Control included) |
| Auto-Sense Turn-On | Yes (with RAP bypass switch) |
| Power Wire Gauge | 4 AWG |
| Power Input Connector | Compression Terminal Block |
| Speaker Wire Gauge | 8 AWG |
| Speaker Output Connector | Compression Terminal Block |
| Cooling | Convection |
| Heatsink | Cast Aluminium |
| Operating Voltage | 9 - 16 VDC |
| Recommended Fuse (not included) | 80A |
| Max Current Draw at 13.8V Sinewave | 52A |
| Visual Indicators | Power: Blue / Protect: Red / C.L.E.A.N. In: Red / C.L.E.A.N. Out: Blue/Red |
| Dimensions (H x W x D) | 49 x 173 x 215mm (1.9 x 6.8 x 8.5 inch) |
| CTA-2006 Compliant | Yes |
| Warranty | 1 Year |
Compatible With / Goes Well With
The R2-500X1 suits car audio builds requiring a dedicated mono subwoofer amplifier at the Prime R2 price point. Its RCA pass-through outputs pair naturally with the R2-500X4 4-channel speaker amplifier for a complete R2 series system.
Goes Well With:
- R2-2X12 / R2-2X10 - Rockford Fosgate Prime dual loaded subwoofer enclosures, a matched Prime series pairing for the R2-500X1 at 2-ohm
- R2D2-12 / R2D2-10 - Prime R2 series individual subwoofers for custom enclosure builds
- R2-500X4 - Companion R2 series 4-channel speaker amplifier, chainable via the R2-500X1's RCA pass-through outputs
- R2-750X5 - Alternative single-unit R2 5-channel amplifier if a combined speaker and subwoofer solution is preferred
- RFK4 - Rockford Fosgate 4 AWG amplifier wiring kit to complete the installation
Frequently Asked Questions
What is the difference between the R2-500X1 and the R2-750X1?
Both are Prime R2 series mono Class-D subwoofer amplifiers with Punch EQ, variable infrasonic filter, RLC remote, and RCA pass-through. The key differences are maximum rated output and impedance stability. The R2-500X1 delivers 500W RMS at 2-ohm and 300W at 4-ohm, with no 1-ohm rating. The R2-750X1 delivers 750W RMS at 1-ohm, 500W at 2-ohm, and 250W at 4-ohm, adding 1-ohm stability for builds using a dual voice coil subwoofer wired to 1-ohm. The R2-500X1 also uses a smaller 80A fuse versus 120A on the R2-750X1. Choose the R2-500X1 for 2-ohm or 4-ohm subwoofer builds; choose the R2-750X1 for maximum output or 1-ohm stability.
What impedance gives the most power from the R2-500X1?
The R2-500X1 delivers maximum rated output at 2-ohm (500W RMS, 590W dynamic). At 4-ohm the rated output is 300W RMS. The R2-500X1 is not 1-ohm rated. For maximum output, pairing with a subwoofer or dual subwoofer configuration wired to a 2-ohm total load is recommended.
Can the R2-500X1 be used with a factory OEM head unit?
Yes. High-level inputs accept OEM head unit speaker outputs at 450mV-12V. Auto-Sense turn-on activates the amplifier automatically when a signal is detected on the high-level input, removing the need for a dedicated remote wire. A RAP bypass switch is also included.
What fuse does the R2-500X1 require and is it included?
The R2-500X1 requires an 80A fuse, which is not included and must be sourced separately. The maximum sinewave current draw is 52A. Install the fuse as close to the battery as possible in the 4 AWG power supply line.
Can I add a speaker amplifier to a system using the R2-500X1?
Yes. The R2-500X1 includes RCA pass-through outputs that are active with both RCA and high-level input, allowing a clean signal to be passed to a downstream 4-channel speaker amplifier such as the R2-500X4. This is the recommended configuration for a complete R2 series car audio system.
Original: $306.64
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Description
Rockford Fosgate R2-500X1 Prime 500 Watt Mono Class-D Subwoofer Amplifier
A 500W mono Class-D subwoofer amplifier rated at 500W x 1 at 2-ohm and 300W x 1 at 4-ohm (CTA-2006 rated). Features Continuously Variable Punch EQ with up to 18dB of bass boost at 45Hz, variable infrasonic filter, C.L.E.A.N. gain calibration, RCA pass-through outputs, RLC remote level control, Rollback Protection, NOMAD speaker protection, and MEHSA4 heat management. Designed and engineered in Tempe, Arizona. Backed by a 1 year warranty.
Product Overview
The Rockford Fosgate R2-500X1 is a 500W mono Class-D subwoofer amplifier from the Prime R2 series, designed for car audio builds requiring dedicated subwoofer amplification at a strong price-to-performance ratio. As a dedicated single-channel subwoofer amplifier, it operates across a frequency range of 20Hz-250Hz. 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.
Unlike the R2-750X1 which is also 1-ohm stable, the R2-500X1 operates at 4-ohm or 2-ohm only. The Continuously Variable onboard Punch EQ delivers up to 18dB of boost at 45Hz. The variable infrasonic filter is tunable from 15Hz to 40Hz at 12dB/octave, providing flexible protection for different subwoofer drivers and enclosure types. RCA pass-through outputs allow the signal to be chained to a companion speaker amplifier. An RLC remote level control is included for in-cabin subwoofer volume adjustment.
High-level inputs (450mV-12V) allow direct integration with OEM head units without RCA outputs. Auto-Sense turn-on activates the amplifier automatically when a signal is detected, with a bypass switch for vehicles with Retained Accessory Power (RAP) systems. C.L.E.A.N. input and output clip indicators guide precise gain calibration. Rollback Protection, NOMAD speaker protection, and MEHSA4 heat management are all active. Cast aluminium heatsink with convection cooling. Designed and engineered in Tempe, Arizona.
Features & Benefits
500W at 2-Ohm - High Output Mono Subwoofer Performance: The R2-500X1 delivers 500W RMS at 2-ohm (590W dynamic) and 300W RMS at 4-ohm, providing substantial subwoofer output for the Prime R2 price point.
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 subwoofer output to be tuned to the acoustic characteristics of the installation without a separate equaliser.
Variable Infrasonic Filter - 15Hz to 40Hz Tunable: The infrasonic filter is tunable from 15Hz to 40Hz at 12dB/octave, providing flexible and adjustable protection for different subwoofer drivers and enclosure types.
RCA Pass-Through Outputs - Downstream Chaining: RCA pass-through outputs are active with both RCA and high-level input, allowing the signal to be passed to a downstream speaker amplifier such as the R2-500X4 without Y-cable noise or signal degradation.
C.L.E.A.N. Technology - Precise Gain Calibration: C.L.E.A.N. (Calibrated Level Eliminates Audible Noise) provides dedicated input and output clip indicator LEDs for precise gain calibration at setup, maximising output while minimising distortion.
RLC Remote Level Control Included: An RLC remote level control is included for in-cabin subwoofer volume adjustment without returning to the amplifier.
Rollback Protection and NOMAD Speaker Protection: Rollback Protection dynamically manages output during sustained high-output conditions to prevent thermal stress on the output devices. NOMAD provides real-time protection against shorted speaker wires and dangerously low impedances.
Auto-Sense Turn-On with RAP Bypass: Auto-Sense activates the amplifier automatically when a high-level input signal is detected, removing the need for a dedicated remote turn-on wire. A bypass switch is included for vehicles with RAP systems.
Technical Specs
| Specification | Detail |
|---|---|
| SKU | R2-500X1 |
| Number of Channels | 1 (Monoblock) |
| Total Power | 500W |
| Rated Power - 4-ohm (CTA-2006, less than 1.0% THD+N) | 300W x 1 |
| Rated Power - 2-ohm (CTA-2006, less than 1.0% THD+N) | 500W x 1 |
| Dynamic Power - 4-ohm (PowerCube) | 350W x 1 |
| Dynamic Power - 2-ohm (PowerCube) | 590W x 1 |
| Circuit Topology | Class-D |
| Bridgeable | No |
| Frequency Response | 20 Hz - 250 Hz |
| THD + Noise | Less than 1.0% at 4-ohm and 2-ohm |
| Input Sensitivity | Low-Level: 150mV - 4V / High-Level: 450mV - 12V |
| Signal Input | 2 x RCA / 4-Pin Molex High-Level |
| Signal Output | 2 x RCA Pass-Thru (active with RCA or High-Level input) |
| Tone Controls | Punch EQ: 0 to +18dB at 45Hz (Continuously Variable) |
| Low-Pass Crossover | 50 Hz - 250 Hz at 12dB/Octave Butterworth |
| Infrasonic Filter | 15 Hz - 40 Hz at 12dB/Octave Butterworth (Variable) |
| Remote Controls | Yes (RLC Remote Level Control included) |
| Auto-Sense Turn-On | Yes (with RAP bypass switch) |
| Power Wire Gauge | 4 AWG |
| Power Input Connector | Compression Terminal Block |
| Speaker Wire Gauge | 8 AWG |
| Speaker Output Connector | Compression Terminal Block |
| Cooling | Convection |
| Heatsink | Cast Aluminium |
| Operating Voltage | 9 - 16 VDC |
| Recommended Fuse (not included) | 80A |
| Max Current Draw at 13.8V Sinewave | 52A |
| Visual Indicators | Power: Blue / Protect: Red / C.L.E.A.N. In: Red / C.L.E.A.N. Out: Blue/Red |
| Dimensions (H x W x D) | 49 x 173 x 215mm (1.9 x 6.8 x 8.5 inch) |
| CTA-2006 Compliant | Yes |
| Warranty | 1 Year |
Compatible With / Goes Well With
The R2-500X1 suits car audio builds requiring a dedicated mono subwoofer amplifier at the Prime R2 price point. Its RCA pass-through outputs pair naturally with the R2-500X4 4-channel speaker amplifier for a complete R2 series system.
Goes Well With:
- R2-2X12 / R2-2X10 - Rockford Fosgate Prime dual loaded subwoofer enclosures, a matched Prime series pairing for the R2-500X1 at 2-ohm
- R2D2-12 / R2D2-10 - Prime R2 series individual subwoofers for custom enclosure builds
- R2-500X4 - Companion R2 series 4-channel speaker amplifier, chainable via the R2-500X1's RCA pass-through outputs
- R2-750X5 - Alternative single-unit R2 5-channel amplifier if a combined speaker and subwoofer solution is preferred
- RFK4 - Rockford Fosgate 4 AWG amplifier wiring kit to complete the installation
Frequently Asked Questions
What is the difference between the R2-500X1 and the R2-750X1?
Both are Prime R2 series mono Class-D subwoofer amplifiers with Punch EQ, variable infrasonic filter, RLC remote, and RCA pass-through. The key differences are maximum rated output and impedance stability. The R2-500X1 delivers 500W RMS at 2-ohm and 300W at 4-ohm, with no 1-ohm rating. The R2-750X1 delivers 750W RMS at 1-ohm, 500W at 2-ohm, and 250W at 4-ohm, adding 1-ohm stability for builds using a dual voice coil subwoofer wired to 1-ohm. The R2-500X1 also uses a smaller 80A fuse versus 120A on the R2-750X1. Choose the R2-500X1 for 2-ohm or 4-ohm subwoofer builds; choose the R2-750X1 for maximum output or 1-ohm stability.
What impedance gives the most power from the R2-500X1?
The R2-500X1 delivers maximum rated output at 2-ohm (500W RMS, 590W dynamic). At 4-ohm the rated output is 300W RMS. The R2-500X1 is not 1-ohm rated. For maximum output, pairing with a subwoofer or dual subwoofer configuration wired to a 2-ohm total load is recommended.
Can the R2-500X1 be used with a factory OEM head unit?
Yes. High-level inputs accept OEM head unit speaker outputs at 450mV-12V. Auto-Sense turn-on activates the amplifier automatically when a signal is detected on the high-level input, removing the need for a dedicated remote wire. A RAP bypass switch is also included.
What fuse does the R2-500X1 require and is it included?
The R2-500X1 requires an 80A fuse, which is not included and must be sourced separately. The maximum sinewave current draw is 52A. Install the fuse as close to the battery as possible in the 4 AWG power supply line.
Can I add a speaker amplifier to a system using the R2-500X1?
Yes. The R2-500X1 includes RCA pass-through outputs that are active with both RCA and high-level input, allowing a clean signal to be passed to a downstream 4-channel speaker amplifier such as the R2-500X4. This is the recommended configuration for a complete R2 series car audio system.
