CACar Audio Guide UK

UK car audio comparison

Best Mono Car Amplifiers Under £300
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

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.

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.

ProductPriceAvailabilityBrandModelWarrantyProduct TypeChannelsListed PowerRms PowerPower DetailFeatureAdditional FeatureShipping WeightFull specifications
Juice JA1201D 1200W 1-Channel Mono Peak Power Car Amplifier, Bass Remote, 1 Ohm Stable, RCA Output£99.99In stockJuiceJA1201D1 Year WarrantyAmps11200WNot listed1 Ohm, Class D, Monoblock, RMS 0-500WRCA Output, SPL AmpRemote Control1 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£134.75In stockKenwoodX502-1Not listedAmps1500WNot listedClass D, Monoblock, RMS 0-500WHi Level InputNot listedNot listedAll listed fields are shown
BLAM RELAX BL-RA251 Ultra-compact Class-D 1-Channel (Monoblock) 350W Amplifier (OEM Compatible)£149.99In stockBLAMBL-RA251Not listedMonoblock Amp (For Subwoofers)1350WNot listedNot listedNot listedNot listedNot listedAll listed fields are shown
Phoenix Gold ZXM500.1i Compact Class-D Mono Amplifier£169.99In stockPhoenix GoldZXM500.1INot listedMonoblock Amp (For Subwoofers)1500W500WNot listedNot listedNot listedNot 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
Phoenix Gold Z3001i 300 Watt (RMS) Monoblock Car Amplifier£169.99In stockPhoenix GoldNot listedNot listedMonoblock Amp (For Subwoofers)1300WNot listedNot listedNot listedNot listedNot listedAll listed fields are shown
AudioControl ACM-1.300 Monoblock Micro Amplifier with Accubass®£189.00In stockAudioControlNot listedNot listedSound Processor1300WNot listedNot listedNot listedNot listed1 kg
  • Subwoofer Design: Active

Product notes

What each pick is best at

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

Best all-round amplifier

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 don't like

  • Unlike some alternatives, the listing does not show a comparable power figure, so matching it to the rest of the system takes more checking.
  • 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
AvailabilityIn stock
Channels1
Listed Power1200W
ModelJA1201D
Subwoofer DesignActive
Warranty1 Year Warranty
Additional FeatureRemote Control
BrandJuice
ClassD amplifier in the series and it won't take up too much boot space either
FeatureRCA Output, SPL Amp
Power Detail1 Ohm, Class D, Monoblock, RMS 0-500W
Product TypeAmps
Shipping Weight1 kg
Check CarAudioCentre.co.uk
Kenwood X502-1 X-Series Class D Mono-Channel Power Amplifier

Best for multi-speaker systems

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 don't like

  • It is £34.76 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
AvailabilityIn stock
Channels1
Listed Power500W
ModelX502-1
BrandKenwood
FeatureHi Level Input
Power DetailClass D, Monoblock, RMS 0-500W
Product TypeAmps
Check CarAudioCentre.co.uk
BLAM RELAX BL-RA251 Ultra-compact Class-D 1-Channel (Monoblock) 350W Amplifier (OEM Compatible)

Best for a dedicated subwoofer

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 don't like

  • It is £50.00 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
AvailabilityIn stock
Channels1
Listed Power350W
ModelBL-RA251
BrandBLAM
Product TypeMonoblock Amp (For Subwoofers)
Check CarAudioCentre.co.uk
Phoenix Gold ZXM500.1i Compact Class-D Mono Amplifier

Best for system tuning

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 don't like

  • It is £70.00 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
AvailabilityIn stock
Channels1
Listed Power500W
ModelZXM500.1I
Rms Power500W
Speaker DesignComponent
BrandPhoenix Gold
ClassD 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
Dimensions165 x 83
Product TypeMonoblock Amp (For Subwoofers)
Check CarAudioCentre.co.uk
Phoenix Gold Z3001i 300 Watt (RMS) Monoblock Car Amplifier

Best for adding headroom

Phoenix Gold Z3001i 300 Watt (RMS) Monoblock Car Amplifier

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

What we don't like

  • It is £70.00 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
AvailabilityIn stock
Channels1
Listed Power300W
BrandPhoenix Gold
Product TypeMonoblock Amp (For Subwoofers)
Check CarAudioCentre.co.uk
AudioControl ACM-1.300 Monoblock Micro Amplifier with Accubass®

Best for a planned upgrade

AudioControl ACM-1.300 Monoblock Micro Amplifier with Accubass®

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

What we don't like

  • It is £89.01 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£189.00
AvailabilityIn stock
Channels1
Listed Power300W
Subwoofer DesignActive
BrandAudioControl
Product TypeSound Processor
Shipping Weight1 kg
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.