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4 Channel Amplifier

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Shop 4-channel amplifiers for your vehicle at Car Audio Centre. A 4-channel car amplifier provides four separate power outputs, letting you run front and rear speakers independently or bridge two channels to power a subwoofer. Our range runs from small 4-channel amps that mount under a seat to models with built-in DSP and full-size Class A/B amplifiers from leading brands such as  Kicker, Phoenix Gold, Pioneer, and Kenwood. Browse the filters below to find the right 4-channel car amplifier for your setup.

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Shop 4 Channel Amplifiers by Type

4 channel amplifiers come in different classes and sizes. Explore the options below to find the right amplifier for your vehicle and setup.

Class D 4 Channel Amplifiers

Class D 4 channel amplifiers are the most common choice for modern car audio, offering high efficiency, lower heat output, and a compact design. They're well suited to installations with limited space, such as under-seat or boot-mounted systems.

Class A/B 4 Channel Amplifiers

Class A/B amplifiers suit drivers who put sound quality first, holding their composure at higher listening levels where a cheaper amp starts to sound strained. They typically require more installation space than a Class D 4 channel amplifier.

Compact 4 Channel Amplifiers

Compact 4‑channel amplifiers are designed for vehicles with limited installation space. They can be mounted under a seat, behind the dashboard, or within tight panels. These are ideal if you want a small 4 channel car amplifier that still drives a full set of door speakers.

Why Choose a 4 Channel Amplifier?

A 4 channel power amplifier brings several practical benefits to a car audio system, beyond simply adding volume.

Power Front & Rear Speakers with a 4 Channel Amplifier

A 4‑channel amplifier provides dedicated power for both front and rear speakers. This delivers cleaner, louder sound across the cabin than a standard head unit amplifier can manage alone.

Bridging a 4 Channel Amplifier for a Subwoofer

Bridging combines two amplifier channels to deliver higher power for a subwoofer, while the remaining channels continue powering your front speakers. This makes a 4 channel amplifier a practical choice for simple speaker and subwoofer setups.

Clean Power Output

A dedicated amplifier delivers cleaner power at higher listening levels than a factory head unit. It helps reduce distortion and protects your speakers from clipping, even when you push the volume.

Works With Your Factory Stereo

Most 4 channel amplifiers in this range accept high level speaker inputs, so you can add one to the stereo already fitted in your car rather than replacing the head unit first. It is the least disruptive way to lift the volume and clarity of a factory system.

FAQs about 4 Channel Amplifiers

What is a 4 channel amplifier?

A 4‑channel amplifier is a car audio amp with four separate power outputs. It can drive four speakers independently or be bridged to power fewer high‑demand speakers or a subwoofer.

Can I run a subwoofer with a 4-channel amp?

You can run a subwoofer with a 4‑channel amp by bridging two channels together to create the extra power it needs. The remaining two channels can then power your front speakers.

Do I need a 4 channel amplifier with DSP?

You don't need one, but a 4 channel amplifier with built-in DSP makes it easier to fine-tune your sound. If you'd rather add processing separately, our Digital Sound Processors can be paired with a standard amplifier instead.

Do I need a wiring kit to fit a 4 channel amp?

Yes, a 4 channel amp needs a dedicated wiring kit to connect it safely to your vehicle's battery and fuse box. Our Amplifier Wiring Kits include the correct gauge cable and fuses for the job.

How many watts do I need from a 4 channel amplifier?

Match the RMS power per channel to the RMS rating of your speakers rather than the peak figures printed on the box. For most factory speaker upgrades, 50 to 75 watts RMS per channel is plenty. If you are fitting aftermarket drivers, check the RMS figure on the car speakers you have chosen and work back from there.