Kicker 51KPX3004 KPX Series 4-Channel 75W RMS x 4 at 2 Ohms, Class-D Car Amplifier
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What's Inside?
- • KPX Series 4-Channel Class-D Car Amplifier
- • 1" Adhesive-backed DIP switch protector
- • 6" 10-Pin Speaker output harness
- • 12" 8-Pin RCA input harness
- • (4) 5/8" screws
- • Power & ground terminal block
- • Instruction sheet
- • Owner's Manual
Why Choose Kicker 51KPX3004 Marine Amplifier?
Compact 4-Channel Powersports Amplifier
Designed to fit under motorcycle fairings or in tight spaces, this amplifier delivers up to 75 W per channel (4 channels) or 150 W bridged, and supports both two- and four-speaker configurations for versatile audio setups.
Weather-Resistant Powersports Amplifier with Built-In Crossover
Designed for outdoor and powersports use, this amplifier features built-in 12 dB variable crossover controls and independent gain adjustments to ensure optimal sound performance in any environment.
Compact Powersports Amplifier with Wide Compatibility
Compatible with both factory and aftermarket radios, this lightweight, small-form-factor amplifier simplifies installation while delivering high sonic performance for clean, detailed sound and long speaker life.
Frequently Asked Questions (FAQ)
- • Why won't the amplifier turn on after I finish wiring it?
Check the battery connection, ground wire, remote turn-on lead, and inline fuse for proper installation. A weak ground or blown fuse is one of the most common causes of power issues.
- • Can this be used on a boat exposed to saltwater?
Yes. It features marine-grade construction designed to resist moisture, corrosion, and UV exposure when properly installed.
- • Why does the amplifier keep going into protect mode?
Protection mode is usually caused by overheating, a wiring short, or an incorrect speaker impedance. Inspect all wiring and verify the connected speaker load meets the amplifier's specifications.
- • Can I connect both full-range speakers and a subwoofer?
Yes, if the amplifier is wired according to its supported channel configuration. Follow the recommended wiring diagrams to ensure safe operation.
- • Why does the amplifier become hot after several hours of use?
Some heat is normal during extended playback at higher power levels. Make sure the amplifier has adequate ventilation and is not mounted inside a sealed compartment.
- • Why do I hear engine noise through my speakers?
Poor grounding or electrical interference from the charging system can introduce unwanted noise. Check the ground connection and keep signal cables away from power wires.
- • Can I use this with my factory marine stereo?
Yes. It is compatible with many factory and aftermarket marine head units when connected correctly.
- • Why does the audio become distorted when I increase the volume?
Distortion is commonly caused by amplifier clipping or incorrect gain settings. Proper tuning helps maintain clean sound while protecting your speakers.
- • Do I need an inline fuse near the battery?
Yes. A properly rated inline fuse installed close to the battery helps protect the amplifier and the boat's electrical system from short circuits.
- • Why does the amplifier shut off while playing loud music?
Low battery voltage, overheating, or an overloaded speaker configuration can activate the protection circuit. Inspect the charging system, cooling airflow, and speaker wiring before continuing operation.
- Maximum Power : 4x75 Watts
- Number of Channels : 4
- Frequency Response : 20-20000 Hz
- Built In Crossovers : Yes
- Amplifier Class : D
Features:
- Compact Footprint: Fits easily under motorcycle fairings or tight spaces.
- Powerful Output: Up to 75 watts per channel (4 channels) or 150 watts bridged per set of channels.
- Supports Multiple Speaker Configurations: Powers two- or four-speaker systems with ease.
- Weather-Resistant Design: Built for outdoor and powersports environments.
- Built-In Crossover Controls: Variable 12dB crossover and independent gain adjustments for optimal performance.
- Wide Input Compatibility: Works with factory or aftermarket radios.
- Easy Installation: Lightweight, small form factor simplifies mounting.
- High Sonic Performance: Ensures long speaker life and clean, detailed sound.
Specifications:
- Power Output (2Ω Stereo): 75 W x 4
- Power Output (4Ω Stereo): 45 W x 4
- Power Output (4Ω Bridged Mono): 150 W x 2
- Dynamic Power: 350 W
- Frequency Response: 20 Hz – 20 kHz
- Crossovers: 60/80/100/120 Hz hi-pass, 12 dB/octave
- Dimensions: W 3-5/16" / 84 mm, H 1-11/16" / 42.7 mm, L 8-1/2" / 216.5 mm
- UPC: 713034043966
- Weight: 1.7
- 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.
