Rockford Fosgate R2-750X1 Prime 750 Watt Mono Amplifier
Rockford Fosgate R2-750X1 Prime 750 Watt Mono Class-D Subwoofer Amplifier
A 750W mono Class-D subwoofer amplifier rated at 750W x 1 at 1-ohm, 500W x 1 at 2-ohm, and 250W 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 R2-750X1 is a 750W 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 250W x 1 at 4-ohm, 500W x 1 at 2-ohm, and 750W x 1 at 1-ohm (CTA-2006, less than 1.0% THD+N). Dynamic power via PowerCube reaches 300W at 4-ohm, 545W at 2-ohm, and 830W at 1-ohm.
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 adjustable protection for different subwoofer drivers and enclosure types. RCA pass-through outputs are active with both RCA and high-level input, allowing the signal to be passed to a second amplifier without degradation. 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 via high-level input is supported, with an Auto-Sense bypass switch for vehicles with Retained Accessory Power (RAP) systems.
C.L.E.A.N. (Calibrated Level Eliminates Audible Noise) input and output clip indicators guide precise gain calibration at setup. Rollback Protection dynamically manages output to prevent thermal stress on the output devices. NOMAD provides real-time protection against shorted speaker wires and dangerously low impedances. MEHSA4 reduces MOSFET temperatures, lowers distortion, and extends output device life. Cast aluminium heatsink with convection cooling. Designed and engineered in Tempe, Arizona.
Features & Benefits
750W at 1-Ohm - Maximum Subwoofer Output: The R2-750X1 delivers its maximum rated output of 750W at 1-ohm (830W dynamic), with stepped output of 500W at 2-ohm and 250W at 4-ohm, providing flexibility to match a wide range of subwoofer impedance configurations.
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 protection for different subwoofer drivers and enclosure types beyond what a fixed infrasonic filter can offer.
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 R2-750X5 without Y-cable noise.
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.
High-Level OEM Input with Auto-Sense Turn-On: High-level inputs accept OEM head unit speaker outputs, with Auto-Sense activating the amplifier automatically when a signal is detected. A bypass switch is included for vehicles with RAP systems.
Technical Specs
| Specification | Detail |
|---|---|
| SKU | R2-750X1 |
| Number of Channels | 1 (Monoblock) |
| Total Power | 750W |
| Rated Power - 4-ohm (CTA-2006, less than 1.0% THD+N) | 250W x 1 |
| Rated Power - 2-ohm (CTA-2006, less than 1.0% THD+N) | 500W x 1 |
| Rated Power - 1-ohm (CTA-2006, less than 1.0% THD+N) | 750W x 1 |
| Dynamic Power - 4-ohm (PowerCube) | 300W x 1 |
| Dynamic Power - 2-ohm (PowerCube) | 545W x 1 |
| Dynamic Power - 1-ohm (PowerCube) | 830W x 1 |
| Circuit Topology | Class-D |
| Bridgeable | No |
| Frequency Response | 20 Hz - 250 Hz |
| THD + Noise | Less than 1.0% at 4-ohm, 2-ohm, and 1-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) | 120A |
| Max Current Draw at 13.8V Sinewave | 71A |
| 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 255mm (1.9 x 6.8 x 10.1 inch) |
| CTA-2006 Compliant | Yes |
| Warranty | 1 Year |
Compatible With / Goes Well With
The R2-750X1 suits car audio builds requiring a dedicated mono subwoofer amplifier at the Prime R2 price point. It pairs naturally with the R2-750X5 via its RCA pass-through outputs for a complete 5-channel plus dedicated mono system.
Goes Well With:
- R2-2X12 / R2-2X10 - Rockford Fosgate Prime dual loaded subwoofer enclosures, a direct application pairing with the R2-750X1 at 2-ohm
- R2D2-12 / R2D2-10 - Prime R2 series individual subwoofers for custom enclosure builds
- R2-750X5 - Companion R2 series 5-channel amplifier for speaker amplification, chainable via the R2-750X1's RCA pass-through outputs
- RFK4 - Rockford Fosgate 4 AWG amplifier wiring kit to complete the installation
- DSR1 - Rockford Fosgate Digital Signal Processor for advanced signal processing ahead of the R2-750X1
Frequently Asked Questions
What impedance gives the most power from the R2-750X1?
The R2-750X1 delivers maximum rated output at 1-ohm (750W RMS, 830W dynamic). At 2-ohm the output is 500W RMS, and at 4-ohm it is 250W RMS. For maximum subwoofer output, a subwoofer or dual subwoofer configuration wired to a 1-ohm or 2-ohm total load is recommended. Contact us for advice on matching your subwoofer configuration to the correct impedance setting.
What is the difference between the R2-750X1 and the R2-750X5?
The R2-750X1 is a monoblock subwoofer amplifier with a single Class-D channel operating from 20Hz-250Hz, delivering up to 750W RMS at 1-ohm. The R2-750X5 is a 5-channel Full-Range Class-D amplifier delivering 100W x 4 plus 350W x 1 at 2-ohm, designed to power both speakers and a subwoofer from the one unit. In most builds, both are used together - the R2-750X5 for speakers and the R2-750X1 for the subwoofer, connected via the R2-750X1's RCA pass-through outputs.
Can the R2-750X1 be used with a factory OEM head unit?
Yes. The R2-750X1 includes high-level inputs (450mV-12V) for direct connection to OEM head unit speaker outputs without RCA outputs. 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 R2-750X1 require and is it included?
The R2-750X1 requires a 120A fuse, which is not included and must be sourced separately. Install the fuse as close to the battery as possible in the 4 AWG power supply line.
Does the R2-750X1 work with a dual voice coil subwoofer?
Yes. A dual voice coil (DVC) subwoofer can be wired in parallel to achieve a 1-ohm or 2-ohm load depending on the coil impedance, allowing you to take advantage of the R2-750X1's maximum output at 1-ohm. Contact us for advice on the correct wiring configuration for your specific subwoofer.
Original: $386.52
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Description
Rockford Fosgate R2-750X1 Prime 750 Watt Mono Class-D Subwoofer Amplifier
A 750W mono Class-D subwoofer amplifier rated at 750W x 1 at 1-ohm, 500W x 1 at 2-ohm, and 250W 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 R2-750X1 is a 750W 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 250W x 1 at 4-ohm, 500W x 1 at 2-ohm, and 750W x 1 at 1-ohm (CTA-2006, less than 1.0% THD+N). Dynamic power via PowerCube reaches 300W at 4-ohm, 545W at 2-ohm, and 830W at 1-ohm.
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 adjustable protection for different subwoofer drivers and enclosure types. RCA pass-through outputs are active with both RCA and high-level input, allowing the signal to be passed to a second amplifier without degradation. 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 via high-level input is supported, with an Auto-Sense bypass switch for vehicles with Retained Accessory Power (RAP) systems.
C.L.E.A.N. (Calibrated Level Eliminates Audible Noise) input and output clip indicators guide precise gain calibration at setup. Rollback Protection dynamically manages output to prevent thermal stress on the output devices. NOMAD provides real-time protection against shorted speaker wires and dangerously low impedances. MEHSA4 reduces MOSFET temperatures, lowers distortion, and extends output device life. Cast aluminium heatsink with convection cooling. Designed and engineered in Tempe, Arizona.
Features & Benefits
750W at 1-Ohm - Maximum Subwoofer Output: The R2-750X1 delivers its maximum rated output of 750W at 1-ohm (830W dynamic), with stepped output of 500W at 2-ohm and 250W at 4-ohm, providing flexibility to match a wide range of subwoofer impedance configurations.
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 protection for different subwoofer drivers and enclosure types beyond what a fixed infrasonic filter can offer.
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 R2-750X5 without Y-cable noise.
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.
High-Level OEM Input with Auto-Sense Turn-On: High-level inputs accept OEM head unit speaker outputs, with Auto-Sense activating the amplifier automatically when a signal is detected. A bypass switch is included for vehicles with RAP systems.
Technical Specs
| Specification | Detail |
|---|---|
| SKU | R2-750X1 |
| Number of Channels | 1 (Monoblock) |
| Total Power | 750W |
| Rated Power - 4-ohm (CTA-2006, less than 1.0% THD+N) | 250W x 1 |
| Rated Power - 2-ohm (CTA-2006, less than 1.0% THD+N) | 500W x 1 |
| Rated Power - 1-ohm (CTA-2006, less than 1.0% THD+N) | 750W x 1 |
| Dynamic Power - 4-ohm (PowerCube) | 300W x 1 |
| Dynamic Power - 2-ohm (PowerCube) | 545W x 1 |
| Dynamic Power - 1-ohm (PowerCube) | 830W x 1 |
| Circuit Topology | Class-D |
| Bridgeable | No |
| Frequency Response | 20 Hz - 250 Hz |
| THD + Noise | Less than 1.0% at 4-ohm, 2-ohm, and 1-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) | 120A |
| Max Current Draw at 13.8V Sinewave | 71A |
| 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 255mm (1.9 x 6.8 x 10.1 inch) |
| CTA-2006 Compliant | Yes |
| Warranty | 1 Year |
Compatible With / Goes Well With
The R2-750X1 suits car audio builds requiring a dedicated mono subwoofer amplifier at the Prime R2 price point. It pairs naturally with the R2-750X5 via its RCA pass-through outputs for a complete 5-channel plus dedicated mono system.
Goes Well With:
- R2-2X12 / R2-2X10 - Rockford Fosgate Prime dual loaded subwoofer enclosures, a direct application pairing with the R2-750X1 at 2-ohm
- R2D2-12 / R2D2-10 - Prime R2 series individual subwoofers for custom enclosure builds
- R2-750X5 - Companion R2 series 5-channel amplifier for speaker amplification, chainable via the R2-750X1's RCA pass-through outputs
- RFK4 - Rockford Fosgate 4 AWG amplifier wiring kit to complete the installation
- DSR1 - Rockford Fosgate Digital Signal Processor for advanced signal processing ahead of the R2-750X1
Frequently Asked Questions
What impedance gives the most power from the R2-750X1?
The R2-750X1 delivers maximum rated output at 1-ohm (750W RMS, 830W dynamic). At 2-ohm the output is 500W RMS, and at 4-ohm it is 250W RMS. For maximum subwoofer output, a subwoofer or dual subwoofer configuration wired to a 1-ohm or 2-ohm total load is recommended. Contact us for advice on matching your subwoofer configuration to the correct impedance setting.
What is the difference between the R2-750X1 and the R2-750X5?
The R2-750X1 is a monoblock subwoofer amplifier with a single Class-D channel operating from 20Hz-250Hz, delivering up to 750W RMS at 1-ohm. The R2-750X5 is a 5-channel Full-Range Class-D amplifier delivering 100W x 4 plus 350W x 1 at 2-ohm, designed to power both speakers and a subwoofer from the one unit. In most builds, both are used together - the R2-750X5 for speakers and the R2-750X1 for the subwoofer, connected via the R2-750X1's RCA pass-through outputs.
Can the R2-750X1 be used with a factory OEM head unit?
Yes. The R2-750X1 includes high-level inputs (450mV-12V) for direct connection to OEM head unit speaker outputs without RCA outputs. 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 R2-750X1 require and is it included?
The R2-750X1 requires a 120A fuse, which is not included and must be sourced separately. Install the fuse as close to the battery as possible in the 4 AWG power supply line.
Does the R2-750X1 work with a dual voice coil subwoofer?
Yes. A dual voice coil (DVC) subwoofer can be wired in parallel to achieve a 1-ohm or 2-ohm load depending on the coil impedance, allowing you to take advantage of the R2-750X1's maximum output at 1-ohm. Contact us for advice on the correct wiring configuration for your specific subwoofer.
