Rockford Fosgate P400X1 Punch 400 Watt Mono Amplifier
Rockford Fosgate P400X1 Punch 400 Watt Mono Amplifier
A Punch series mono Class A/B amplifier delivering 400W RMS at 2 Ohm and 250W RMS at 4 Ohm, designed for medium to high-powered subwoofer applications. Features on-board Punch EQ with +18dB bass boost at 45Hz, C.L.E.A.N. setup system, variable 12dB Butterworth crossover, high-level input with Auto Turn-On, RCA pass-thru outputs, and a stealth top-mounted control panel sized to fit under any seat. Backed by a 1 year warranty.
Product Overview
The Rockford Fosgate P400X1 is a mono Class A/B amplifier from the Punch series, purpose-built for subwoofer applications in medium to high-powered car audio systems. The 2 Ohm stable mono output makes it suitable for running up to four 4 Ohm DVC subwoofers. Power handling is 400W RMS at 2 Ohm and 250W RMS at 4 Ohm, CTA-2006 compliant.
The P400X1 features an on-board Punch EQ2 with up to +18dB bass boost at 45Hz and up to +12dB treble boost at 12.5kHz (function dependent on LP/AP/HP switch position), and a variable 12dB/octave Butterworth crossover covering 50-250Hz in both high-pass and low-pass modes with all-pass available. C.L.E.A.N. setup is built in for accurate gain setting. High-level input with Auto Turn-On circuit allows direct connection from factory speaker outputs. An optional PLC2 Remote Punch Level Control (sold separately) is compatible for remote bass control with input clip indicator. RCA pass-thru outputs are available for daisy-chaining additional amplifiers.
The stealth top-mounted control panel keeps all controls accessible while allowing the amplifier to be installed under any seat. Muted turn-on prevents thumps during power-up. Protection features include NOMAD short circuit and over current protection, Dynamic Thermal Management (DTM), and thermal LED indication. DSM and MEHSA3 technologies reduce MOSFET temperature, lower distortion, and extend component life.
Features & Benefits
400W RMS at 2 Ohm - Compact Subwoofer Power: Delivers 400W RMS at 2 Ohm and 250W RMS at 4 Ohm in a compact mono amplifier sized to fit under any vehicle seat, making it ideal for space-restricted subwoofer installations.
On-Board Punch EQ2 with Bass and Treble Boost: The Punch EQ2 provides up to +18dB boost at 45Hz for powerful bass enhancement and up to +12dB boost at 12.5kHz for treble control, with function dependent on the LP/AP/HP crossover switch position.
C.L.E.A.N. Setup System: The built-in C.L.E.A.N. (Comprehensive Level Evaluation And Normalisation) system provides a guided, accurate method for setting input gain to maximise output while minimising distortion.
Variable 12dB Butterworth Crossover (High-Pass, Low-Pass, All-Pass): The variable crossover covers 50-250Hz in both high-pass and low-pass modes at 12dB/octave Butterworth slope, with all-pass bypass available.
High-Level Input with Auto Turn-On: Direct high-level speaker input with Auto Turn-On allows the amplifier to connect directly to factory or aftermarket head unit speaker outputs without requiring a separate remote turn-on wire.
RCA Pass-Thru Outputs: A dedicated RCA pass-thru output allows daisy-chaining of additional amplifiers in the system without signal degradation.
Optional PLC2 Remote Punch Level Control: The P400X1 is wired remote ready for the optional PLC2 Remote Punch Level Control (sold separately), providing remote bass level adjustment with input clip LED indicator from inside the cabin.
NOMAD Short Circuit and Over Current Protection: NOMAD is a real-time analogue computer that protects the amplifier against shorting speaker wires and dangerously low speaker impedances.
Stealth Top-Mounted Control Panel: All controls are accessible from the top of the amplifier unit, allowing installation under a seat while keeping settings accessible without removing the amplifier.
Technical Specs
| Specification | Detail |
|---|---|
| SKU | P400X1 |
| Brand | Rockford Fosgate |
| Series | Punch |
| Type | Mono Amplifier |
| Class | Class A/B |
| Power Output (CTA-2006) | |
| RMS @ 4 Ohm | 250W x 1 |
| RMS @ 2 Ohm | 400W x 1 |
| Dynamic Power @ 4 Ohm | 327W x 1 |
| Dynamic Power @ 2 Ohm | 563W x 1 |
| Total Power | 400W |
| Bridgeable | No |
| Audio | |
| Frequency Response | 20Hz - 20kHz (+/- 1.0dB) |
| THD+N @ 4 Ohm | < 1.0% |
| THD+N @ 2 Ohm | < 1.0% |
| Efficiency (avg) | 73% @ 4 Ohm |
| Inputs / Outputs | |
| Signal Input | 1 x RCA pair (Hi/Low level, 150mV - 12V) |
| Signal Output | 1 x RCA pair (pass-thru) |
| High-Level Input | Yes (with Auto Turn-On) |
| Controls | |
| Punch EQ2 Bass | 0 to +18dB @ 45Hz |
| Punch EQ2 Treble | 0 to +12dB @ 12.5kHz |
| Crossover (HP) | 50-250Hz @ 12dB/octave Butterworth |
| Crossover (LP) | 50-250Hz @ 12dB/octave Butterworth |
| All-Pass | Yes |
| Remote Control | Optional PLC2 (sold separately) |
| C.L.E.A.N. Setup | Yes |
| LED Indicators | |
| Power/Protect/Thermal | Yes |
| Input Clip LED | Blue (<0.5% THD) / Violet (1% THD) / Red (10%+ THD) |
| Output Clip LED | Blue (<0.5% THD) / Violet (1% THD) / Red (10%+ THD) |
| Power and Installation | |
| Operating Voltage | 9-16 VDC |
| Average Current Draw | 30A @ 13.8V (music) |
| Max Current Draw | 60A @ 13.8V (sinewave) |
| Recommended Fuse | 60A (not included) |
| Suggested Alternator | 75A |
| Power Wire Gauge | 4-8 AWG |
| Speaker Wire Gauge | 8-18 AWG |
| Cooling | Convection / Cast Aluminium Heatsink |
| Physical | |
| Dimensions | 6.05cm (H) x 19.71cm (W) x 25.04cm (D) |
| Certifications | CTA-2006, CE Compliant, Engineered in USA |
| Warranty | 1 Year |
Goes Well With
- Rockford Fosgate PLC2 Remote Punch Level Control (sold separately - remote bass control with clip indicator)
Frequently Asked Questions
What subwoofer configurations are compatible with the P400X1?
The P400X1 is 2 Ohm mono stable, making it suitable for running up to four 4 Ohm DVC (Dual Voice Coil) subwoofers wired to a 2 Ohm load. Please consult the amplifier owner's manual and refer to the available wiring diagrams to confirm the correct wiring configuration for your subwoofer(s) before installation.
What is C.L.E.A.N. and why should I use it?
C.L.E.A.N. (Comprehensive Level Evaluation And Normalisation) is Rockford Fosgate's guided gain-setting system. Using C.L.E.A.N. ensures the amplifier input gain is set correctly to maximise output power without introducing clipping distortion from the source unit. Incorrect gain setting is one of the most common causes of speaker and amplifier damage.
Does the P400X1 turn on automatically without a remote wire?
Yes. The P400X1 features an Auto Turn-On circuit when using the high-level input. This allows the amplifier to detect signal from the speaker outputs and turn on automatically, making it suitable for OEM integration without a dedicated remote turn-on wire.
What does the LED clip indicator system show?
The P400X1 uses a three-colour LED clip indicator system. Blue indicates less than 0.5% THD (clean signal), violet indicates approximately 1% THD (mild clipping), and red indicates 10% or more THD (heavy clipping). This provides real-time visual feedback for gain and level setting during and after installation.
Can I add a remote bass control to the P400X1?
Yes. The P400X1 is wired remote ready for the optional Rockford Fosgate PLC2 Remote Punch Level Control, available separately. The PLC2 mounts inside the cabin and provides remote adjustment of the bass level with a built-in input clip indicator LED.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
Rockford Fosgate P400X1 Punch 400 Watt Mono Amplifier
A Punch series mono Class A/B amplifier delivering 400W RMS at 2 Ohm and 250W RMS at 4 Ohm, designed for medium to high-powered subwoofer applications. Features on-board Punch EQ with +18dB bass boost at 45Hz, C.L.E.A.N. setup system, variable 12dB Butterworth crossover, high-level input with Auto Turn-On, RCA pass-thru outputs, and a stealth top-mounted control panel sized to fit under any seat. Backed by a 1 year warranty.
Product Overview
The Rockford Fosgate P400X1 is a mono Class A/B amplifier from the Punch series, purpose-built for subwoofer applications in medium to high-powered car audio systems. The 2 Ohm stable mono output makes it suitable for running up to four 4 Ohm DVC subwoofers. Power handling is 400W RMS at 2 Ohm and 250W RMS at 4 Ohm, CTA-2006 compliant.
The P400X1 features an on-board Punch EQ2 with up to +18dB bass boost at 45Hz and up to +12dB treble boost at 12.5kHz (function dependent on LP/AP/HP switch position), and a variable 12dB/octave Butterworth crossover covering 50-250Hz in both high-pass and low-pass modes with all-pass available. C.L.E.A.N. setup is built in for accurate gain setting. High-level input with Auto Turn-On circuit allows direct connection from factory speaker outputs. An optional PLC2 Remote Punch Level Control (sold separately) is compatible for remote bass control with input clip indicator. RCA pass-thru outputs are available for daisy-chaining additional amplifiers.
The stealth top-mounted control panel keeps all controls accessible while allowing the amplifier to be installed under any seat. Muted turn-on prevents thumps during power-up. Protection features include NOMAD short circuit and over current protection, Dynamic Thermal Management (DTM), and thermal LED indication. DSM and MEHSA3 technologies reduce MOSFET temperature, lower distortion, and extend component life.
Features & Benefits
400W RMS at 2 Ohm - Compact Subwoofer Power: Delivers 400W RMS at 2 Ohm and 250W RMS at 4 Ohm in a compact mono amplifier sized to fit under any vehicle seat, making it ideal for space-restricted subwoofer installations.
On-Board Punch EQ2 with Bass and Treble Boost: The Punch EQ2 provides up to +18dB boost at 45Hz for powerful bass enhancement and up to +12dB boost at 12.5kHz for treble control, with function dependent on the LP/AP/HP crossover switch position.
C.L.E.A.N. Setup System: The built-in C.L.E.A.N. (Comprehensive Level Evaluation And Normalisation) system provides a guided, accurate method for setting input gain to maximise output while minimising distortion.
Variable 12dB Butterworth Crossover (High-Pass, Low-Pass, All-Pass): The variable crossover covers 50-250Hz in both high-pass and low-pass modes at 12dB/octave Butterworth slope, with all-pass bypass available.
High-Level Input with Auto Turn-On: Direct high-level speaker input with Auto Turn-On allows the amplifier to connect directly to factory or aftermarket head unit speaker outputs without requiring a separate remote turn-on wire.
RCA Pass-Thru Outputs: A dedicated RCA pass-thru output allows daisy-chaining of additional amplifiers in the system without signal degradation.
Optional PLC2 Remote Punch Level Control: The P400X1 is wired remote ready for the optional PLC2 Remote Punch Level Control (sold separately), providing remote bass level adjustment with input clip LED indicator from inside the cabin.
NOMAD Short Circuit and Over Current Protection: NOMAD is a real-time analogue computer that protects the amplifier against shorting speaker wires and dangerously low speaker impedances.
Stealth Top-Mounted Control Panel: All controls are accessible from the top of the amplifier unit, allowing installation under a seat while keeping settings accessible without removing the amplifier.
Technical Specs
| Specification | Detail |
|---|---|
| SKU | P400X1 |
| Brand | Rockford Fosgate |
| Series | Punch |
| Type | Mono Amplifier |
| Class | Class A/B |
| Power Output (CTA-2006) | |
| RMS @ 4 Ohm | 250W x 1 |
| RMS @ 2 Ohm | 400W x 1 |
| Dynamic Power @ 4 Ohm | 327W x 1 |
| Dynamic Power @ 2 Ohm | 563W x 1 |
| Total Power | 400W |
| Bridgeable | No |
| Audio | |
| Frequency Response | 20Hz - 20kHz (+/- 1.0dB) |
| THD+N @ 4 Ohm | < 1.0% |
| THD+N @ 2 Ohm | < 1.0% |
| Efficiency (avg) | 73% @ 4 Ohm |
| Inputs / Outputs | |
| Signal Input | 1 x RCA pair (Hi/Low level, 150mV - 12V) |
| Signal Output | 1 x RCA pair (pass-thru) |
| High-Level Input | Yes (with Auto Turn-On) |
| Controls | |
| Punch EQ2 Bass | 0 to +18dB @ 45Hz |
| Punch EQ2 Treble | 0 to +12dB @ 12.5kHz |
| Crossover (HP) | 50-250Hz @ 12dB/octave Butterworth |
| Crossover (LP) | 50-250Hz @ 12dB/octave Butterworth |
| All-Pass | Yes |
| Remote Control | Optional PLC2 (sold separately) |
| C.L.E.A.N. Setup | Yes |
| LED Indicators | |
| Power/Protect/Thermal | Yes |
| Input Clip LED | Blue (<0.5% THD) / Violet (1% THD) / Red (10%+ THD) |
| Output Clip LED | Blue (<0.5% THD) / Violet (1% THD) / Red (10%+ THD) |
| Power and Installation | |
| Operating Voltage | 9-16 VDC |
| Average Current Draw | 30A @ 13.8V (music) |
| Max Current Draw | 60A @ 13.8V (sinewave) |
| Recommended Fuse | 60A (not included) |
| Suggested Alternator | 75A |
| Power Wire Gauge | 4-8 AWG |
| Speaker Wire Gauge | 8-18 AWG |
| Cooling | Convection / Cast Aluminium Heatsink |
| Physical | |
| Dimensions | 6.05cm (H) x 19.71cm (W) x 25.04cm (D) |
| Certifications | CTA-2006, CE Compliant, Engineered in USA |
| Warranty | 1 Year |
Goes Well With
- Rockford Fosgate PLC2 Remote Punch Level Control (sold separately - remote bass control with clip indicator)
Frequently Asked Questions
What subwoofer configurations are compatible with the P400X1?
The P400X1 is 2 Ohm mono stable, making it suitable for running up to four 4 Ohm DVC (Dual Voice Coil) subwoofers wired to a 2 Ohm load. Please consult the amplifier owner's manual and refer to the available wiring diagrams to confirm the correct wiring configuration for your subwoofer(s) before installation.
What is C.L.E.A.N. and why should I use it?
C.L.E.A.N. (Comprehensive Level Evaluation And Normalisation) is Rockford Fosgate's guided gain-setting system. Using C.L.E.A.N. ensures the amplifier input gain is set correctly to maximise output power without introducing clipping distortion from the source unit. Incorrect gain setting is one of the most common causes of speaker and amplifier damage.
Does the P400X1 turn on automatically without a remote wire?
Yes. The P400X1 features an Auto Turn-On circuit when using the high-level input. This allows the amplifier to detect signal from the speaker outputs and turn on automatically, making it suitable for OEM integration without a dedicated remote turn-on wire.
What does the LED clip indicator system show?
The P400X1 uses a three-colour LED clip indicator system. Blue indicates less than 0.5% THD (clean signal), violet indicates approximately 1% THD (mild clipping), and red indicates 10% or more THD (heavy clipping). This provides real-time visual feedback for gain and level setting during and after installation.
Can I add a remote bass control to the P400X1?
Yes. The P400X1 is wired remote ready for the optional Rockford Fosgate PLC2 Remote Punch Level Control, available separately. The PLC2 mounts inside the cabin and provides remote adjustment of the bass level with a built-in input clip indicator LED.
