Rockford Fosgate R2-250X1 Prime 250 Watt Mono Amplifier
Rockford Fosgate R2-250X1 Prime 250 Watt Mono Class D Amplifier
When your subwoofer demands dedicated power, the R2-250X1 delivers 250 watts of efficient Class D performance with the tuning tools to dial in every detail of your bass.
Product Overview
The R2-250X1 is part of Rockford Fosgate's 3rd generation Prime Series, developed for car audio enthusiasts who want a capable, no-compromise monoblock amplifier at an accessible price. Rated at 250 watts RMS into 2 ohms, it operates as a Class D monoblock designed specifically for subwoofer duty, with a frequency response limited to 20-250 Hz and a variable Low-Pass crossover to match any subwoofer configuration. Beyond raw power, the R2-250X1 comes equipped with an integrated Punch EQ for up to 18 dB of bass boost at 45 Hz, a variable Infrasonic Filter to protect the subwoofer from damaging low-frequency resonance, and an included RLC Remote Level Control for convenient bass adjustment from the driver's seat. MEHSA 4 thermal management and Rollback Protection ensure the amplifier stays reliable under sustained demand, while NOMAD actively monitors outputs against shorts and impedance faults. Designed and engineered in Tempe, Arizona, the R2-250X1 is built by fanatics, for fanatics.
Features & Benefits
C.L.E.A.N. Technology (Patent 8,712,066): Rockford Fosgate's patented Calibrated Level Eliminates Audible Noise circuit uses dedicated input and output clip LEDs (C.L.E.A.N. IN Red, C.L.E.A.N. OUT Blue/Red) to accurately match the source unit's output to the amplifier's input sensitivity, removing distortion before it reaches the subwoofer.
P.O.W.E.R. Supply: Onboard power supply design that continues to generate output above the rated RMS figure as vehicle voltage increases, so real-world performance scales beyond the spec sheet across the 9-16V operating range.
Integrated Punch EQ: Continuously variable onboard bass equaliser providing 0 to +18 dB of boost at 45 Hz, correcting for acoustic deficiencies in the listening environment and delivering up to 3x the perceived bass without an external processor.
Variable Infrasonic Filter: Adjustable high-pass filter operating from 15 to 40 Hz at 12 dB/octave Butterworth, removing subsonic frequencies that can damage a subwoofer's voice coil and excursion limits without contributing audible bass output.
MEHSA 4 (Maximum Efficiency Heat Sink Application): Advanced thermal management system that reduces MOSFET operating temperatures, lowers distortion levels, increases overall durability, and extends the lifespan of output devices under sustained use.
Rollback Protection: During demanding musical conditions, the amplifier dynamically reduces power demand to prevent stress on output devices, preserving both the amplifier and the connected subwoofer under real-world listening conditions.
NOMAD Protection: A real-time analogue computer that continuously monitors the amplifier's speaker outputs and protects against shorted speaker wires and dangerously low speaker impedances, providing active fault management rather than passive fusing alone.
Balanced Differential Inputs: Differential input topology eliminates noise picked up by signal cables between the source unit and amplifier, delivering a cleaner signal into the amplifier stage.
Includes RLC Remote Level Control: A remote level control is included in the box, allowing bass output to be adjusted from the driver's seat without accessing the amplifier directly.
High Level Input Capable: Accepts both low-level RCA (150mV-4V) and high-level speaker signals (450mV-12V), making integration with factory head units straightforward.
Auto-Sense RAP Bypass: Auto-Sense bypass switch supports vehicles with Retained Accessory Power (RAP), allowing the amplifier to power on and off correctly using speaker-level signal detection without requiring a dedicated remote turn-on wire.
RCA Pass-Through Outputs: 2-channel RCA pass-through remains active with both RCA and high-level inputs, allowing an additional amplifier to be added downstream without splitting cables at the head unit.
CTA-2006 and CE Compliant: All power ratings verified at 14.4V with 1% or less THD to CTA-2006 industry standards, with no inflated peak figures used anywhere in the specifications.
Technical Specs
| Specification | Detail |
|---|---|
| SKU | R2-250X1 |
| Series | Prime |
| Number of Channels | 1 |
| Amplifier Class | Class D |
| Total RMS Power | 250W |
| RMS Power @ 4 Ohm | 150W x 1 |
| RMS Power @ 2 Ohm | 250W x 1 |
| Dynamic Power @ 4 Ohm | 209W x 1 |
| Dynamic Power @ 2 Ohm | 328W x 1 |
| Bridgeable | No |
| Frequency Response | 20 Hz - 250 Hz |
| THD @ 4 Ohm | <1.0% |
| THD @ 2 Ohm | <1.0% |
| Input Sensitivity (Low-Level) | 150 mV - 4V |
| Input Sensitivity (High-Level) | 450 mV - 12V |
| Signal Input | 2 x RCA low-level, 4-Pin Molex high-level |
| Signal Output | 2 x RCA pass-through (active with RCA or high-level input) |
| Punch EQ | 0 to +18 dB @ 45 Hz |
| Low-Pass Crossover | 50-250 Hz @ 12 dB/octave Butterworth |
| Infrasonic Filter | 15-40 Hz @ 12 dB/octave Butterworth |
| Remote Controls | Yes (RLC Remote Level Control included) |
| Visual Indicators | POWER (Blue), PROTECT (Red), C.L.E.A.N. IN (Red), C.L.E.A.N. OUT (Blue/Red) |
| Operating Voltage | 9-16V DC |
| Recommended Fuse | 50A (not included) |
| Power Wire Gauge | 4 AWG |
| Speaker Wire Gauge | 8 AWG |
| Power Input Connector | Compression Terminal Block |
| Speaker Output Connector | Compression Terminal Block |
| Cooling | Convection / Heatsink (MEHSA 4) |
| Dimensions (H x W x D) | 1.9" x 6.8" x 8.1" (4.9 cm x 17.3 cm x 20.5 cm) |
| Warranty | 1 Year |
| Compliance | CTA-2006, CE |
Goes Well With
The R2-250X1 pairs naturally with Rockford Fosgate Prime R1 and R2 subwoofers, including the R1S410, R1S412, R2SD2-12, and R2D2-12, giving it a matched system from a single brand. A 4-gauge amplifier wiring kit is required for power and ground runs, and 8-gauge cable is needed for the speaker output. A quality pair of RCA interconnects is recommended for clean signal transfer from the head unit. For systems requiring additional channels for front and rear speakers, the R2-250X1 pairs directly with the R2-300X4 using the onboard RCA pass-through.
Frequently Asked Questions
What is the R2-250X1 designed for, and can it power full-range speakers?
The R2-250X1 is a dedicated monoblock amplifier designed specifically for subwoofer applications. Its frequency response is limited to 20-250 Hz and its crossover controls are Low-Pass and Infrasonic only, making it unsuitable for powering full-range or component speakers. For full-range speaker channels, a separate 4-channel amplifier such as the R2-300X4 is required.
What does the Infrasonic Filter do, and why is it important for a subwoofer?
The variable Infrasonic Filter removes subsonic frequencies below 15-40 Hz (adjustable) that are inaudible to the human ear but cause excessive cone excursion in a subwoofer. Without this filter, ported subwoofer enclosures in particular can be damaged by these frequencies at high power. Setting the filter appropriately extends subwoofer lifespan and allows the amplifier to focus available power within the audible bass range.
Does the R2-250X1 include a remote bass control, and how does it work?
Yes. An RLC Remote Level Control is included in the box. It connects to the remote level control input on the amplifier and allows the driver to adjust bass output level from a convenient dash-mounted position without accessing the amplifier. This is particularly useful when the amplifier is installed in a boot or under a seat.
What does Rollback Protection do?
During sustained high-demand listening conditions, Rollback Protection dynamically reduces the amplifier's power output to prevent thermal stress on the output devices. Rather than shutting the amplifier down entirely, it maintains audio playback at a reduced level, protecting the amplifier and connected subwoofer while keeping the system running.
What gauge wire is required, and is the fuse included?
The R2-250X1 requires 4 AWG power and ground wire and 8 AWG speaker wire, both using the onboard compression terminal block connectors. The recommended 50A fuse is not included in the box and must be sourced separately. The fuse should be installed in the power cable as close to the battery as possible.
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Description
Rockford Fosgate R2-250X1 Prime 250 Watt Mono Class D Amplifier
When your subwoofer demands dedicated power, the R2-250X1 delivers 250 watts of efficient Class D performance with the tuning tools to dial in every detail of your bass.
Product Overview
The R2-250X1 is part of Rockford Fosgate's 3rd generation Prime Series, developed for car audio enthusiasts who want a capable, no-compromise monoblock amplifier at an accessible price. Rated at 250 watts RMS into 2 ohms, it operates as a Class D monoblock designed specifically for subwoofer duty, with a frequency response limited to 20-250 Hz and a variable Low-Pass crossover to match any subwoofer configuration. Beyond raw power, the R2-250X1 comes equipped with an integrated Punch EQ for up to 18 dB of bass boost at 45 Hz, a variable Infrasonic Filter to protect the subwoofer from damaging low-frequency resonance, and an included RLC Remote Level Control for convenient bass adjustment from the driver's seat. MEHSA 4 thermal management and Rollback Protection ensure the amplifier stays reliable under sustained demand, while NOMAD actively monitors outputs against shorts and impedance faults. Designed and engineered in Tempe, Arizona, the R2-250X1 is built by fanatics, for fanatics.
Features & Benefits
C.L.E.A.N. Technology (Patent 8,712,066): Rockford Fosgate's patented Calibrated Level Eliminates Audible Noise circuit uses dedicated input and output clip LEDs (C.L.E.A.N. IN Red, C.L.E.A.N. OUT Blue/Red) to accurately match the source unit's output to the amplifier's input sensitivity, removing distortion before it reaches the subwoofer.
P.O.W.E.R. Supply: Onboard power supply design that continues to generate output above the rated RMS figure as vehicle voltage increases, so real-world performance scales beyond the spec sheet across the 9-16V operating range.
Integrated Punch EQ: Continuously variable onboard bass equaliser providing 0 to +18 dB of boost at 45 Hz, correcting for acoustic deficiencies in the listening environment and delivering up to 3x the perceived bass without an external processor.
Variable Infrasonic Filter: Adjustable high-pass filter operating from 15 to 40 Hz at 12 dB/octave Butterworth, removing subsonic frequencies that can damage a subwoofer's voice coil and excursion limits without contributing audible bass output.
MEHSA 4 (Maximum Efficiency Heat Sink Application): Advanced thermal management system that reduces MOSFET operating temperatures, lowers distortion levels, increases overall durability, and extends the lifespan of output devices under sustained use.
Rollback Protection: During demanding musical conditions, the amplifier dynamically reduces power demand to prevent stress on output devices, preserving both the amplifier and the connected subwoofer under real-world listening conditions.
NOMAD Protection: A real-time analogue computer that continuously monitors the amplifier's speaker outputs and protects against shorted speaker wires and dangerously low speaker impedances, providing active fault management rather than passive fusing alone.
Balanced Differential Inputs: Differential input topology eliminates noise picked up by signal cables between the source unit and amplifier, delivering a cleaner signal into the amplifier stage.
Includes RLC Remote Level Control: A remote level control is included in the box, allowing bass output to be adjusted from the driver's seat without accessing the amplifier directly.
High Level Input Capable: Accepts both low-level RCA (150mV-4V) and high-level speaker signals (450mV-12V), making integration with factory head units straightforward.
Auto-Sense RAP Bypass: Auto-Sense bypass switch supports vehicles with Retained Accessory Power (RAP), allowing the amplifier to power on and off correctly using speaker-level signal detection without requiring a dedicated remote turn-on wire.
RCA Pass-Through Outputs: 2-channel RCA pass-through remains active with both RCA and high-level inputs, allowing an additional amplifier to be added downstream without splitting cables at the head unit.
CTA-2006 and CE Compliant: All power ratings verified at 14.4V with 1% or less THD to CTA-2006 industry standards, with no inflated peak figures used anywhere in the specifications.
Technical Specs
| Specification | Detail |
|---|---|
| SKU | R2-250X1 |
| Series | Prime |
| Number of Channels | 1 |
| Amplifier Class | Class D |
| Total RMS Power | 250W |
| RMS Power @ 4 Ohm | 150W x 1 |
| RMS Power @ 2 Ohm | 250W x 1 |
| Dynamic Power @ 4 Ohm | 209W x 1 |
| Dynamic Power @ 2 Ohm | 328W x 1 |
| Bridgeable | No |
| Frequency Response | 20 Hz - 250 Hz |
| THD @ 4 Ohm | <1.0% |
| THD @ 2 Ohm | <1.0% |
| Input Sensitivity (Low-Level) | 150 mV - 4V |
| Input Sensitivity (High-Level) | 450 mV - 12V |
| Signal Input | 2 x RCA low-level, 4-Pin Molex high-level |
| Signal Output | 2 x RCA pass-through (active with RCA or high-level input) |
| Punch EQ | 0 to +18 dB @ 45 Hz |
| Low-Pass Crossover | 50-250 Hz @ 12 dB/octave Butterworth |
| Infrasonic Filter | 15-40 Hz @ 12 dB/octave Butterworth |
| Remote Controls | Yes (RLC Remote Level Control included) |
| Visual Indicators | POWER (Blue), PROTECT (Red), C.L.E.A.N. IN (Red), C.L.E.A.N. OUT (Blue/Red) |
| Operating Voltage | 9-16V DC |
| Recommended Fuse | 50A (not included) |
| Power Wire Gauge | 4 AWG |
| Speaker Wire Gauge | 8 AWG |
| Power Input Connector | Compression Terminal Block |
| Speaker Output Connector | Compression Terminal Block |
| Cooling | Convection / Heatsink (MEHSA 4) |
| Dimensions (H x W x D) | 1.9" x 6.8" x 8.1" (4.9 cm x 17.3 cm x 20.5 cm) |
| Warranty | 1 Year |
| Compliance | CTA-2006, CE |
Goes Well With
The R2-250X1 pairs naturally with Rockford Fosgate Prime R1 and R2 subwoofers, including the R1S410, R1S412, R2SD2-12, and R2D2-12, giving it a matched system from a single brand. A 4-gauge amplifier wiring kit is required for power and ground runs, and 8-gauge cable is needed for the speaker output. A quality pair of RCA interconnects is recommended for clean signal transfer from the head unit. For systems requiring additional channels for front and rear speakers, the R2-250X1 pairs directly with the R2-300X4 using the onboard RCA pass-through.
Frequently Asked Questions
What is the R2-250X1 designed for, and can it power full-range speakers?
The R2-250X1 is a dedicated monoblock amplifier designed specifically for subwoofer applications. Its frequency response is limited to 20-250 Hz and its crossover controls are Low-Pass and Infrasonic only, making it unsuitable for powering full-range or component speakers. For full-range speaker channels, a separate 4-channel amplifier such as the R2-300X4 is required.
What does the Infrasonic Filter do, and why is it important for a subwoofer?
The variable Infrasonic Filter removes subsonic frequencies below 15-40 Hz (adjustable) that are inaudible to the human ear but cause excessive cone excursion in a subwoofer. Without this filter, ported subwoofer enclosures in particular can be damaged by these frequencies at high power. Setting the filter appropriately extends subwoofer lifespan and allows the amplifier to focus available power within the audible bass range.
Does the R2-250X1 include a remote bass control, and how does it work?
Yes. An RLC Remote Level Control is included in the box. It connects to the remote level control input on the amplifier and allows the driver to adjust bass output level from a convenient dash-mounted position without accessing the amplifier. This is particularly useful when the amplifier is installed in a boot or under a seat.
What does Rollback Protection do?
During sustained high-demand listening conditions, Rollback Protection dynamically reduces the amplifier's power output to prevent thermal stress on the output devices. Rather than shutting the amplifier down entirely, it maintains audio playback at a reduced level, protecting the amplifier and connected subwoofer while keeping the system running.
What gauge wire is required, and is the fuse included?
The R2-250X1 requires 4 AWG power and ground wire and 8 AWG speaker wire, both using the onboard compression terminal block connectors. The recommended 50A fuse is not included in the box and must be sourced separately. The fuse should be installed in the power cable as close to the battery as possible.
