Rockford Fosgate P500X1BD Punch Series 300W RMS x 1 at 2-Ohms, Class B/D Mono Subwoofer Car Amplifier
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What's Inside?
- • Punch Series Mono Subwoofer Car Amplifier
- • (4) 1-1/2" Self-tapping screws
- • 2.5mm Allen wrench
- • Quick setup instructions
- • Certificate of Performance
- • Owner's Manual
Why Choose Rockford Fosgate P500X1BD Mono Subwoofer Amplifier?
Clean, Efficient Bass Power That Just Hits Different
The Rockford Fosgate P500X1BD Class-BD Mono Subwoofer Car Amplifier is built for bass lovers who want strong output without overloading their electrical system. Its Class BD mono architecture blends high efficiency with low distortion, giving you up to 500W x 1 at 1 ohm while keeping things smooth and controlled. Whether you are running a single powerful sub or pushing a compact setup, the impedance-adaptive power delivery keeps output stable at 150W x 1 at 4 ohms, 300W x 1 at 2 ohms, and full power at 1 ohm.
Built to Stay Cool, Stable, and Reliable Under Pressure
This amplifier is designed for real-world abuse, not just short bursts of power. The cast aluminum heatsink improves cooling efficiency by about 30 percent, helping the amp stay stable during long listening sessions. MEHSA³ thermal technology improves heat transfer from the MOSFETs, while DSM precision surface mount engineering reduces noise and keeps internal temperatures under control. Add in the intelligent NOMAD protection system, and you get real-time monitoring of heat, voltage, current, and impedance that protects your system without killing your bass unless absolutely necessary.
Full Control Bass Tuning with Easy System Expansion
Dialing in your low end is simple with this amp. You get a variable low-pass crossover from 50Hz to 250Hz, a Punch EQ bass boost up to +18dB at 45Hz, and a fixed 28Hz infrasonic filter that keeps your sub clean and protected at deep frequencies. Balanced differential inputs help eliminate noise for cleaner signal flow, while 4-gauge power support, dual speaker outputs, RCA pass-through, and optional PLC2 remote level control make system expansion and real-time bass adjustment easy.
Frequently Asked Questions (FAQ)
- • Why does the amplifier cut out while I'm driving?
Intermittent cutouts can come from loose wiring, unstable RCA signals, or a problem with the amplifier output. Check all connections and test the signal path carefully.
- • Why does it shut down when I turn the volume up?
A low speaker impedance, voltage drop, excessive current demand, or clipping can cause the amplifier to shut down. Check the load and electrical supply under heavy use.
- • Why does it go into protect mode?
A speaker short, impedance below the amplifier's limit, overheating, or a power problem can activate protection. Inspect the speaker wiring and verify the final load.
- • Why does the amplifier get very hot?
High output levels, inadequate airflow, low impedance, or insufficient electrical supply can increase heat. Provide ventilation and verify the load and power connections.
- • Why does it stay powered but stop producing bass?
A reported installation issue involved the amplifier remaining powered while output voltage gradually dropped to zero. Check the RCA signal, speaker load, and amplifier output.
- • Why is the subwoofer output weak even though everything is connected?
Low RCA signal, incorrect gain, wiring problems, or a faulty line output converter can reduce output. Test the signal at the amplifier before replacing components.
- • Why does the bass suddenly sound like static?
Static or abnormal noise from both subwoofers can indicate an unstable signal or amplifier output problem. Test another RCA source and inspect the signal connections.
- • Why does it work briefly and then stop?
Working normally for a few minutes before cutting out can indicate thermal, electrical, or internal problems. Monitor voltage and temperature while the amplifier is operating.
- • Why does the system distort even when the clipping indicator isn't obvious?
An amplifier can still receive a distorted input signal from the head unit or line output converter. Check the source signal and set the gain correctly before increasing volume.
- • What should I check if changing the subwoofer doesn't fix the problem?
If multiple subwoofers or enclosures produce the same symptoms, the issue may be elsewhere in the signal chain. Check the RCA cables, line output converter, power, ground, and amplifier.
- Maximum Power : 500 Watts
- Number of Channels : 1
- Frequency Response : 20-250 Hz
- Amplifier Class : B/D
- Fuse Rating : 80 A
Features:
- High-Efficiency Class-BD Mono Amplification Architecture: Utilizes Rockford Fosgate’s patented Class BD topology to deliver the efficiency of Class D with lower distortion characteristics than conventional Class A/B designs, achieving up to 500W x 1 at 1Ω while reducing strain on the vehicle electrical system.
- Impedance-Adaptive Power Delivery System: Engineered to provide 150W x 1 at 4Ω, 300W x 1 at 2Ω, and 500W x 1 at 1Ω, ensuring stable high-output performance across varying subwoofer configurations.
- Certified CEA-2006 Power Measurement Accuracy: Built to CEA-2006 standards for RMS output and signal-to-noise evaluation at 14.4V with ≤1% THD+N, enabling accurate, standardized amplifier performance comparison.
- Advanced Cast Aluminum Thermal Dissipation Platform: Features a high-efficiency cast aluminum heatsink that improves cooling performance by approximately 30% compared to extruded designs, supporting consistent thermal stability under heavy load.
- MEHSA³ High-Efficiency MOSFET Heat Transfer System: Incorporates third-generation Maximum Efficiency Heat Sink Application technology to enhance thermal transfer from MOSFET devices, improving durability and sustaining high-power output.
- DSM Precision Surface-Mount Circuit Engineering: Built using automated high-speed assembly with 1% tolerance components and optimized PCB trace layout to reduce electrical noise, improve efficiency, and lower operating temperatures.
- Intelligent NOMAD Protection Control System: Continuously monitors temperature, voltage, current, and impedance using real-time analog decision processing, protecting the amplifier without unnecessary output limiting.
- Subwoofer-Optimized Signal Processing Controls: Includes a variable low-pass crossover (50–250Hz), continuously adjustable Punch EQ bass boost up to +18dB at 45Hz, and a fixed 28Hz infrasonic filter for improved subwoofer protection and clarity.
- Balanced Differential Input Noise Rejection System: Eliminates unwanted signal interference by canceling common-mode noise, ensuring only clean audio signals are amplified for improved clarity and signal integrity.
- Flexible High-Current Connectivity and Expansion Support: Supports 4-gauge power wiring with 80-amp external fuse requirement, dual speaker outputs for parallel subwoofer wiring, RCA pass-through outputs, and optional remote Punch Level Control via PLC2 interface.
Specifications:
- RMS Power Output (Watts x Channels): 150 x 1
- Peak Power Output (Watts x Channels): N/A
- Power at 2 Ohms (Watts x Channels): 300 x 1
- Bridged Power (Watts x Channels): N/A
- Minimum Impedance Bridged: N/A
- Minimum Impedance Unbridged: 1
- Minimum Impedance: 1
- Best Frequency Response: 20-250 Hz
- THD at Rated RMS Power: 1%
- Signal to Noise Ratio: 80 dB
- Input Voltage: 14.4v
- Amplifier Class: BD
- Low-Pass Crossover Frequency: 50-250 Hz
- Low-Pass Slope (dB/octave): 12 dB/octave
- High-Pass Crossover Frequency: N/A
- High-Pass Slope (dB/octave): N/A
- Bass Boost: 0-18 dB
- Bass Boost Frequency: 45 Hz
- Fan Cooled: No
- Fuse Rating: 80
- Speaker Level Inputs: Yes
- Preamp Outputs: 2
- Width (inches): 11-1/8
- Height (inches): 2-7/16
- Depth (inches): 8-13/16
- Parts Warranty: 1 Year
- Labor Warranty: 1 Year
- UPC: 780687332471
- Weight: 11
- Authorized Internet Dealer
Warranty: 2 Year(s) Warranty.
This item is accompanied by a manufacturer's warranty. If it is found to be defective, it may be returned to OnlineCarstereo.com for replacement within 2 Year(s) from the original date of purchase with proper return authorization.
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Write a review!
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I highly recommend this amp if you enjoy
the sound and feel of bass!!
Eric G.
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This thing really pumps power to my 10-inch sub. I'm stoked with how it's holding up.
