CACar Audio Guide UK

UK car audio comparison

Best Car Amplifiers for Subwoofers
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 Car Audio JA902 900W 2-Channel Bridgeable Car Power Amplifier, Thermal Protection, RCS Output, Bass Boost, Class A-B

A 2-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 Car Audio JA902 900W 2-Channel Bridgeable Car Power Amplifier, Thermal Protection, RCS Output, Bass Boost, Class A-B£55.50In stockJuiceJA9021 Year WarrantyAmps2900WNot listedClassA-B, RMS 50-75WBridgeable, Hi Level InputNot listedNot listedAll listed fields are shown
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
MTX TR275 Terminator 220W 2 Channel Class A/B Full Range Amplifier£139.99In stockMTXTR275Not listed2 Channel Amp2220W110WNot listedHi Level InputNot listedNot listed
  • Class: AB wide range amplifier 2x110W RMS @ 2Ω and THD + N ≤1% 2x75W RMS @ 4Ω and THD + N ≤1% 1x220W RMS br
  • Dimensions: 180 x 135 x 52mm
  • Subwoofer Design: Active
Ground Zero GZIA 200.2 2-channel high quality class A/B amplifier£149.99In stockGround ZeroGZIA 200.2Not listed2 Channel Amp2135WNot listedNot listedNot listedNot listedNot listed
  • Crossover: Features adjustable high-pass (HPF) and low-pass (LPF) filters to tailor the signal to your specific
  • Frequency Response: 8 Hz – 28 kHz Dimensions (W x L x H): 168 x 49 x 248 mm Key Features Class A/B Technology: Combines
  • Subwoofer Design: Active
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

Product notes

What each pick is best at

Juice Car Audio JA902 900W 2-Channel Bridgeable Car Power Amplifier, Thermal Protection, RCS Output, Bass Boost, Class A-B

Best all-round amplifier

Juice Car Audio JA902 900W 2-Channel Bridgeable Car Power Amplifier, Thermal Protection, RCS Output, Bass Boost, Class A-B

A 2-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 channels figure, so matching it to the rest of the system takes more checking.
  • The amplifier or processor still needs matching to the speakers, subwoofer, impedance and available installation space.
Price£55.50
AvailabilityIn stock
Channels2
Listed Power900W
ModelJA902
Warranty1 Year Warranty
BrandJuice
FeatureBridgeable, Hi Level Input
Power DetailClassA-B, RMS 50-75W
Product TypeAmps
Check CarAudioCentre.co.uk
Juice JA1201D 1200W 1-Channel Mono Peak Power Car Amplifier, Bass Remote, 1 Ohm Stable, RCA Output

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 don't like

  • It is £44.49 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
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 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 don't like

  • It is £79.25 above the cheapest pick, so the higher price depends on whether the distinct 500W 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£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
MTX TR275 Terminator 220W 2 Channel Class A/B Full Range Amplifier

Best for system tuning

MTX TR275 Terminator 220W 2 Channel Class A/B Full Range Amplifier

A 2-channel amplifier option for adding cleaner headroom to a planned car-audio system.

What we don't like

  • It is £84.49 above the cheapest pick, so the higher price depends on whether the distinct 220W power suits the installation.
  • The amplifier or processor still needs matching to the speakers, subwoofer, impedance and available installation space.
Price£139.99
AvailabilityIn stock
Channels2
Listed Power220W
ModelTR275
Rms Power110W
Subwoofer DesignActive
BrandMTX
ClassAB wide range amplifier 2x110W RMS @ 2Ω and THD + N ≤1% 2x75W RMS @ 4Ω and THD + N ≤1% 1x220W RMS br
Dimensions180 x 135 x 52mm
FeatureHi Level Input
Product Type2 Channel Amp
Check CarAudioCentre.co.uk
Ground Zero GZIA 200.2 2-channel high quality class A/B amplifier

Best for adding headroom

Ground Zero GZIA 200.2 2-channel high quality class A/B amplifier

A 2-channel amplifier option for adding cleaner headroom to a planned car-audio system.

What we don't like

  • It is £94.49 above the cheapest pick, so the higher price depends on whether the distinct 135W power suits the installation.
  • The amplifier or processor still needs matching to the speakers, subwoofer, impedance and available installation space.
Price£149.99
AvailabilityIn stock
Channels2
Listed Power135W
ModelGZIA 200.2
Subwoofer DesignActive
BrandGround Zero
CrossoverFeatures adjustable high-pass (HPF) and low-pass (LPF) filters to tailor the signal to your specific
Frequency Response8 Hz – 28 kHz Dimensions (W x L x H): 168 x 49 x 248 mm Key Features Class A/B Technology: Combines
Product Type2 Channel Amp
Check CarAudioCentre.co.uk
BLAM RELAX BL-RA251 Ultra-compact Class-D 1-Channel (Monoblock) 350W Amplifier (OEM Compatible)

Best for a planned upgrade

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 £94.49 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
AvailabilityIn stock
Channels1
Listed Power350W
ModelBL-RA251
BrandBLAM
Product TypeMonoblock 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.