UK car audio comparison

Best Class D Car Amplifiers
in 2026.

A practical comparison of car amplifiers and processors using channel count, useful power and the system matching checks that matter.

Prices and stock should be checked on the retailer page before purchase.

Our approach. We compare the specifications shown on the retailer product pages and explain who each model suits. This is not a hands-on test.

Our pick

Kenwood KAC-M1814 4-Channel Compact Bridgeable Marine/Motorsports 400W Max Power Digital Amplifier

A 4-channel amplifier option for adding cleaner headroom to a planned car-audio system.

Check price

Full specifications

Our picks compared

This table includes every verified specification available for the products in this roundup. Check the retailer page for the latest price, stock and fitment details.

Product	Price	Availability	Brand	Model	Warranty	Product Type	Channels	Listed Power	Rms Power	Power Detail	Feature	Additional Feature	Shipping Weight	Full specifications
Kenwood KAC-M1814 4-Channel Compact Bridgeable Marine/Motorsports 400W Max Power Digital Amplifier	£99.50	In stock	Kenwood	KAC-M1814	Not listed	Amps	4	400W	Not listed	ClassD, RMS 0-50W	Bridgeable, Hi Level Input	Not listed	Not listed	Class: D amplifier with 400 peak power supports louder volume for Car, Marine and Motorsports users with lo Type: Compact Amp
Juice JA1201D 1200W 1-Channel Mono Peak Power Car Amplifier, Bass Remote, 1 Ohm Stable, RCA Output	£99.99	In stock	Juice	JA1201D	1 Year Warranty	Amps	1	1200W	Not listed	1 Ohm, Class D, Monoblock, RMS 0-500W	RCA Output, SPL Amp	Remote Control	1 kg	Class: D amplifier in the series and it won't take up too much boot space either Subwoofer Design: Active
Kenwood X502-1 X-Series Class D Mono-Channel Power Amplifier	£134.75	In stock	Kenwood	X502-1	Not listed	Amps	1	500W	Not listed	Class D, Monoblock, RMS 0-500W	Hi Level Input	Not listed	Not listed	All listed fields are shown
BLAM RELAX BL-RA251 Ultra-compact Class-D 1-Channel (Monoblock) 350W Amplifier (OEM Compatible)	£149.99	In stock	BLAM	BL-RA251	Not listed	Monoblock Amp (For Subwoofers)	1	350W	Not listed	Not listed	Not listed	Not listed	Not listed	All listed fields are shown
Kenwood X302-4 300W 4 Channel Class D Compact Power Amplifier	£169.99	In stock	Kenwood	X302-4	Not listed	Amps	4	300W	Not listed	ClassD, RMS 50-75W	Bridgeable, Hi Level Input	Not listed	Not listed	Type: Compact Amp
Phoenix Gold ZXM500.1i Compact Class-D Mono Amplifier	£169.99	In stock	Phoenix Gold	ZXM500.1I	Not listed	Monoblock Amp (For Subwoofers)	1	500W	500W	Not listed	Not listed	Not listed	Not listed	Class: D technology, it delivers clean, efficient, and powerful sound that suits any environment, D Mono Mini Amplifier 500W RMS x 1 @ 1Ω 360W RMS x 1 @ 2Ω 230W RMS x 1 @ 4Ω Frequency Response: 20Hz, D efficiency ensures maximum output with minimal heat and distortion Dimensions: 165 x 83 Speaker Design: Component

Product notes

What each pick is best at

Best all-round amplifier

Kenwood KAC-M1814 4-Channel Compact Bridgeable Marine/Motorsports 400W Max Power Digital Amplifier

A 4-channel amplifier option for adding cleaner headroom to a planned car-audio system.

What we like

Lowest listed price in this comparison at £99.50, £0.49 below Juice JA1201D.
The only pick here listing 400W power, giving it a clear difference from the other 5 options.
The listed 4-channel layout makes its intended role easier to match to speakers or a subwoofer.

What we don't like

Unlike some alternatives, the listing does not show a comparable channels figure, so matching it to the rest of the system takes more checking.
A four-channel installation needs more wiring and load matching than a compact single-purpose setup.

Price	£99.50
Availability	In stock
Channels	4
Listed Power	400W
Model	KAC-M1814
Brand	Kenwood
Class	D amplifier with 400 peak power supports louder volume for Car, Marine and Motorsports users with lo
Feature	Bridgeable, Hi Level Input
Power Detail	ClassD, RMS 0-50W
Product Type	Amps
Type	Compact Amp

Check CarAudioCentre.co.uk

Best for multi-speaker systems

Juice JA1201D 1200W 1-Channel Mono Peak Power Car Amplifier, Bass Remote, 1 Ohm Stable, RCA Output

A 1-channel amplifier option for adding cleaner headroom to a planned car-audio system.

What we like

At £99.99, it costs £0.49 more than Kenwood KAC-M1814, so the extra spend is tied to the specification and fitment choice.
The only pick here listing 1200W power, giving it a clear difference from the other 5 options.
The listed 1-channel layout makes its intended role easier to match to speakers or a subwoofer.

What we don't like

It is £0.49 above the cheapest pick, so the higher price depends on whether the distinct 1200W power suits the installation.
A mono layout is intended for a subwoofer rather than a full speaker system, so it is less flexible than multi-channel picks.

Price	£99.99
Availability	In stock
Channels	1
Listed Power	1200W
Model	JA1201D
Subwoofer Design	Active
Warranty	1 Year Warranty
Additional Feature	Remote Control
Brand	Juice
Class	D amplifier in the series and it won't take up too much boot space either
Feature	RCA Output, SPL Amp
Power Detail	1 Ohm, Class D, Monoblock, RMS 0-500W
Product Type	Amps
Shipping Weight	1 kg

Check CarAudioCentre.co.uk

Best for a dedicated subwoofer

Kenwood X502-1 X-Series Class D Mono-Channel Power Amplifier

A 1-channel amplifier option for adding cleaner headroom to a planned car-audio system.

What we like

At £134.75, it costs £35.25 more than Kenwood KAC-M1814, so the extra spend is tied to the specification and fitment choice.
Its listed 1-channel channels matches 3 other picks, making like-for-like installation planning easier.
The listed 1-channel layout makes its intended role easier to match to speakers or a subwoofer.

What we don't like

It is £35.25 above the cheapest pick without a clearly unique listed specification to explain the difference.
A mono layout is intended for a subwoofer rather than a full speaker system, so it is less flexible than multi-channel picks.

Price	£134.75
Availability	In stock
Channels	1
Listed Power	500W
Model	X502-1
Brand	Kenwood
Feature	Hi Level Input
Power Detail	Class D, Monoblock, RMS 0-500W
Product Type	Amps

Check CarAudioCentre.co.uk

Best for system tuning

BLAM RELAX BL-RA251 Ultra-compact Class-D 1-Channel (Monoblock) 350W Amplifier (OEM Compatible)

A 1-channel amplifier option for adding cleaner headroom to a planned car-audio system.

What we like

At £149.99, it costs £50.49 more than Kenwood KAC-M1814, so the extra spend is tied to the specification and fitment choice.
The only pick here listing 350W power, giving it a clear difference from the other 5 options.
The listed 1-channel layout makes its intended role easier to match to speakers or a subwoofer.

What we don't like

It is £50.49 above the cheapest pick, so the higher price depends on whether the distinct 350W power suits the installation.
A mono layout is intended for a subwoofer rather than a full speaker system, so it is less flexible than multi-channel picks.

Price	£149.99
Availability	In stock
Channels	1
Listed Power	350W
Model	BL-RA251
Brand	BLAM
Product Type	Monoblock Amp (For Subwoofers)

Check CarAudioCentre.co.uk

Best for adding headroom

Kenwood X302-4 300W 4 Channel Class D Compact Power Amplifier

A 4-channel amplifier option for adding cleaner headroom to a planned car-audio system.

What we like

At £169.99, it costs £70.49 more than Kenwood KAC-M1814, so the extra spend is tied to the specification and fitment choice.
The only pick here listing 300W power, giving it a clear difference from the other 5 options.
The listed 4-channel layout makes its intended role easier to match to speakers or a subwoofer.

What we don't like

It is £70.49 above the cheapest pick, so the higher price depends on whether the distinct 300W power suits the installation.
A four-channel installation needs more wiring and load matching than a compact single-purpose setup.

Price	£169.99
Availability	In stock
Channels	4
Listed Power	300W
Model	X302-4
Brand	Kenwood
Feature	Bridgeable, Hi Level Input
Power Detail	ClassD, RMS 50-75W
Product Type	Amps
Type	Compact Amp

Check CarAudioCentre.co.uk

Best for a planned upgrade

Phoenix Gold ZXM500.1i Compact Class-D Mono Amplifier

A 1-channel amplifier option for adding cleaner headroom to a planned car-audio system.

What we like

At £169.99, it costs £70.49 more than Kenwood KAC-M1814, so the extra spend is tied to the specification and fitment choice.
Its listed 1-channel channels matches 3 other picks, making like-for-like installation planning easier.
The listed 1-channel layout makes its intended role easier to match to speakers or a subwoofer.

What we don't like

It is £70.49 above the cheapest pick without a clearly unique listed specification to explain the difference.
A mono layout is intended for a subwoofer rather than a full speaker system, so it is less flexible than multi-channel picks.

Price	£169.99
Availability	In stock
Channels	1
Listed Power	500W
Model	ZXM500.1I
Rms Power	500W
Speaker Design	Component
Brand	Phoenix Gold
Class	D technology, it delivers clean, efficient, and powerful sound that suits any environment, D Mono Mini Amplifier 500W RMS x 1 @ 1Ω 360W RMS x 1 @ 2Ω 230W RMS x 1 @ 4Ω Frequency Response: 20Hz, D efficiency ensures maximum output with minimal heat and distortion
Dimensions	165 x 83
Product Type	Monoblock Amp (For Subwoofers)

Check CarAudioCentre.co.uk

Buying guide

What to check before ordering

Match the amplifier to the speakers or subwoofer at the correct impedance. Plan power cable routing, fuse placement, signal cables and ventilation before deciding that the largest watt figure is the best fit.

Use the model number as the final reference. Retailer images and prices can change, and vehicle fitment should be confirmed for the exact make, model and year.

Best Class D Car Amplifiersin 2026.

Kenwood KAC-M1814 4-Channel Compact Bridgeable Marine/Motorsports 400W Max Power Digital Amplifier

Our picks compared

What each pick is best at

Kenwood KAC-M1814 4-Channel Compact Bridgeable Marine/Motorsports 400W Max Power Digital Amplifier

What we like

What we don't like

Juice JA1201D 1200W 1-Channel Mono Peak Power Car Amplifier, Bass Remote, 1 Ohm Stable, RCA Output

What we like

What we don't like

Kenwood X502-1 X-Series Class D Mono-Channel Power Amplifier

What we like

What we don't like

BLAM RELAX BL-RA251 Ultra-compact Class-D 1-Channel (Monoblock) 350W Amplifier (OEM Compatible)

What we like

What we don't like

Kenwood X302-4 300W 4 Channel Class D Compact Power Amplifier

What we like

What we don't like

Phoenix Gold ZXM500.1i Compact Class-D Mono Amplifier

What we like

What we don't like

What to check before ordering

Best Class D Car Amplifiers
in 2026.