Kicker 51KPX3004 4 Channel Class D Amplifier 300w RMS
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KPX 300W Weather Resistant 4-Channel Amp
51KPX3004
The KPX300.4 is engineered to deliver massive power in a compact, weather-resistant design - perfect for motorcycles, boats, or any vehicle with limited space. Don’t let its small footprint fool you; this amp is built to drive up to 4 speakers with clarity and precision, without putting extra strain on your charging system.
Designed for versatility, it powers two- or four-speaker setups with ease. Independent gains and a variable 12dB crossover ensure optimal speaker performance, longevity, and sonic clarity. With a wide input range, it’s easy to integrate with virtually any factory or aftermarket radio.
Features
- Compact design fits under fairings or tight spaces
- Powers 2- or 4-speaker systems effortlessly
- Up to 300+ watts of clean power
- Weather-resistant construction for outdoor and marine use
- Built-in crossover controls for precise tuning
- Variable 12dB/octave hi-pass crossovers: 60/80/100/120Hz
- Puts very little strain on charging system
Explore the full range in 4 Channel Amplifiers.
Specification
| Power (watts/ch), 2 Ohm Stereo | 75x4 |
|---|---|
| Power (watts/ch), 4 Ohm Stereo | 45x4 |
| Power (watts/ch), 4 Ohm Bridged Mono | 150x2 |
| Dynamic Power (watts) | 350 |
| Output Channels | 4 |
| Voltage (V) | 12 |
| Class | D |
| Fuse Rating (A) | 40A |
| Cable Gauge (AWG) | 8 |
| Amp Turn-On | DC Offset / 12V |
| Frequency Response | (Hz) 20-20k |
| Filter | High-Pass |
| Controller | N/A |
| Crossovers | 60/80/100/120Hz hi-pass, 12dB/octave |
| Input Channels | 2 / 4 |
| Input Type | High Level / Low Level |
| Input Sensitivity Low Level | N/A |
| Input Sensitivity High Level | 250mV-10V |
| Height (cm) | 4.3 |
| Width (cm) | 22 |
| Depth (cm) | 8.4 |
What's Included
- Kicker 51KPX3004
About the brand
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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.
