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The Kicker 51KPX5001 is a 1-channel Class D mono subwoofer amplifier from the Kicker KPX range, delivering 150W RMS at 4 ohms, 300W RMS at 2 ohms and 500W RMS at 1 ohm in a compact, weather-resistant enclosure.
Key specifications
- Channels: 1 (mono), Class D
- RMS power: 150W at 4 ohms, 300W at 2 ohms, 500W at 1 ohm
- Crossover: variable low-pass, 24 dB/octave
- Subsonic filter: variable, 24 dB/octave
- Frequency response: 10–160 Hz
- Remote: CXARC compatible (sold separately)
- Dimensions: 4.3 cm H x 9.2 cm W x 21.7 cm L
KPX 500W Monoblock Class D Subwoofer Amplifier (51KPX5001)
The KPX500.1 delivers up to 500W in a compact, weather-resistant build suited to motorcycles, boats and vehicles with limited space. Despite its small footprint, it places very little strain on your charging system.
A 24 dB/octave variable low-pass crossover and 24 dB/octave variable subsonic filter let you protect your subwoofers and dial in your sound precisely. The wide input range makes integration straightforward with factory or aftermarket head units. Add dashboard bass control with the Kicker 46CXARC remote bass control, sold separately.
Features
- Compact design fits under fairings or in tight spaces
- Dedicated subwoofer amplifier
- Up to 500W of clean power
- Weather-resistant construction for outdoor and marine use
- Built-in crossover controls for precise tuning
- CXARC remote bass control compatible
- Minimal strain on the vehicle charging system
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Specification
| RMS Power @ 14.4V | 150W x 1 @ 4Ω / 300W x 1 @ 2Ω / 500W x 1 @ 1Ω |
|---|---|
| Output Channels | 1 |
| Voltage (V) | 12 |
| Class | D |
| Fuse Rating (A) | 60A |
| Cable Gauge (AWG) | 8 |
| Amp Turn-On | DC Offset / 12V |
| Frequency Response | (Hz) 10-160 |
| Signal-to-Noise Ratio (dB) | 90 |
| Filter | Low-Pass |
| Controller | CXARC (Sold Separately) |
| Input Channels | 2 |
| Input Type | High Level / Low Level |
| Input Sensitivity Low Level | N/A |
| Height (cm) | 4.3 |
| Width (cm) | 9.2 |
| Length (cm) | 21.7 |
What's Included
- Kicker 51KPX5001
Kicker
About the Kicker 51KPX5001
From our tech experts at CEN
The Kicker 51KPX5001 is a 1-channel Class D mono subwoofer amplifier from the KPX range, rated at 150W RMS at 4 ohms, 300W RMS at 2 ohms and 500W RMS at 1 ohm. Its compact dimensions — 4.3cm H x 9.2cm W x 21.7cm L — and weather-resistant construction make it well suited to motorcycles, boats and cars with limited installation space.
Who it suits
It suits anyone needing a powerful, compact subwoofer amplifier in a space-constrained or exposed environment. If more output is a priority, the Kicker 46CXA800.1 offers up to 800W RMS in a traditional car amplifier format.
Our tech experts advise
The 51KPX5001 accepts both high-level and low-level inputs, so it works with factory or aftermarket head units without an adapter. Use 8 AWG power cable as specified. The variable 24 dB/octave low-pass crossover and subsonic filter allow precise bass tuning and subwoofer protection. Installation pricing is per vehicle — contact our team at CEN Nottingham for a quote.
Explore the full Kicker range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all Kicker
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Have it Fitted By Our Team
Our team fits car audio, stereos, dash cams and vehicle security at our workshop in Beeston, Nottingham. Tell us your vehicle and we'll confirm the parts and a fitted price.
- 1
Tell us your vehicle
Make, model and year, and what you'd like fitted.
- 2
We confirm the parts
Fascia, wiring and interfaces checked for your car, with a fitted price.
- 3
Fitted at our workshop
Bring it to our Beeston workshop and we do the rest.
Unit 25 Technology Drive, Beeston, Nottingham NG9 1LA
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Frequently Asked Questions
Q: How do I choose the right amplifier for my speakers or subwoofer?
A: Match the amplifier's RMS output per channel to the RMS handling of your speakers or subwoofer at the same impedance. The Specification tab lists the power figures. If in doubt, contact CEN with your setup and we will recommend a match.
Q: What wiring do I need to install this amplifier?
A: You will need an amplifier wiring kit sized to the amplifier's power draw, typically including power and earth cable, a fuse, RCA leads and a remote wire. CEN stocks complete wiring kits, and the amplifier's fuse rating is the guide to the cable gauge required.
Q: What class of amplifier is this and does it matter?
A: Class D amplifiers are compact and efficient, ideal for subwoofers and modern installs. Class AB designs are traditionally favoured for outright sound quality on mid and high frequencies. The class is listed in the Specification tab where provided.
Q: Will an amplifier work with my factory head unit?
A: Yes, in most cases. If your head unit has no RCA outputs you will need a line output converter to feed the amplifier a clean signal. CEN stocks line output converters and can advise the right one for your vehicle.
Q: Can CEN install this amplifier?
A: Yes. CEN offers professional amplifier installation from our Nottingham premises, including secure mounting, wiring and setup. Contact us to book.
Q: How much power does the Kicker 51KPX5001 produce?
A: It delivers 150W RMS at 4 ohms, 300W RMS at 2 ohms and 500W RMS at 1 ohm, at 14.4V.
Q: Does the 51KPX5001 have a bass remote?
A: A remote is not included, but the amplifier is compatible with the Kicker CXARC remote bass control, sold separately.
Q: Can the 51KPX5001 be used on a motorcycle or boat?
A: Yes. It has a compact, weather-resistant design that fits under motorcycle fairings and suits boats and other vehicles with limited space.
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