CACar Audio Guide UK

UK car audio comparison

Best Car Subwoofers Under £400
in 2026.

A practical comparison of car subwoofers using enclosure type, power, dimensions and the installation space they need.

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

JS8.1 1000W 8" Single Voice Coil 4 Ohm Subwoofer Bass Driver

A 8-inch bass subwoofer choice for adding more weight to the 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 TypeSizeListed PowerRms PowerFeatureShipping WeightFull specifications
JS8.1 1000W 8" Single Voice Coil 4 Ohm Subwoofer Bass Driver£44.50In stockJuiceJS81 Year WarrantySubwoofer8 inch1000WNot listedNot listed5 kg
  • Bundle Options: Sub Only, Add Compatible Sealed Enclosure, Add Compatible Ported Enclosure, Add Compatible Sealed Enclosure and Amp, Add Compatible Ported Enclosure and Amp
Juice JS10 1200W 10" Single Voice Coil 4 Ohm Subwoofer Bass Driver£49.99In stockJuiceJS101 Year WarrantySubwoofer10 inch1200WNot listedNot listed5 kg
  • Bundle Options: Sub Only, Add Compatible Sealed Enclosure, Add Compatible Ported Enclosure, Add Compatible Sealed Enclosure and Amp, Add Compatible Ported Enclosure and Amp
Juice JS12.1 1400W 12" Single Voice Coil 4 Ohm Subwoofer Bass Driver£49.99In stockJuiceJS121 Year WarrantySubwoofer12 inch1400WNot listedNot listed5 kg
  • Bundle Options: Sub Only, Add Compatible Sealed Enclosure, Add Compatible Ported Enclosure, Add Compatible Sealed Enclosure and Amp, Add Compatible Ported Enclosure and Amp
  • Speaker Design: Component
Pioneer TS-A30S4 12" A-Series Component Subwoofer 1400W MAX£64.99In stockPioneerTS-A30S4Not listedCar Subwoofers12 inch1400WNot listedSingle Voice CoilNot listed
  • Power Detail: 4 Ohm
  • Size Detail: 12 inch
  • Speaker Design: Component
Kenwood KFC-PS2517W PS-series 25cm subwoofer£64.99In stockKenwoodNot listedNot listedCar Subwoofers10 inch2517W400WNot listedNot listed
  • Frequency Range: Broad response from 27 Hz to 300 Hz , capturing low-frequency sub-bass drops effectively
  • Impedance: 4 Ohms single voice coil configuration, allowing for straightforward wiring with most mono or bridge
  • Power Handling: 400W RMS (Continuous Power) with a peak input handling capacity listed between 1300W and 2000W depen
  • Sensitivity: Rated at 83 dB , meaning it responds well to proper, clean amplification
  • Speaker Design: Component
In Phase XT-10 Kevlar Cone 2 Ohm Dual Voice Coil 1200W Peak Power Subwoofer£69.99In stockIn PhaseXT-102 Year WarrantyCar SubwoofersNot listed1200WNot listedDual Voice Coil5 kg
  • Power Detail: 2 Ohm
  • Size Detail: 10 inch

Product notes

What each pick is best at

JS8.1 1000W 8" Single Voice Coil 4 Ohm Subwoofer Bass Driver

Best overall bass upgrade

JS8.1 1000W 8" Single Voice Coil 4 Ohm Subwoofer Bass Driver

A 8-inch bass subwoofer choice for adding more weight to the 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.
  • The enclosure and underseat or boot dimensions still need checking, even where the product is described as compact.
Price£44.50
AvailabilityIn stock
Listed Power1000W
ModelJS8
Size8 inch
Warranty1 Year Warranty
BrandJuice
Bundle OptionsSub Only, Add Compatible Sealed Enclosure, Add Compatible Ported Enclosure, Add Compatible Sealed Enclosure and Amp, Add Compatible Ported Enclosure and Amp
Product TypeSubwoofer
Shipping Weight5 kg
Check CarAudioCentre.co.uk
Juice JS10 1200W 10" Single Voice Coil 4 Ohm Subwoofer Bass Driver

Best for compact installations

Juice JS10 1200W 10" Single Voice Coil 4 Ohm Subwoofer Bass Driver

A 10-inch bass subwoofer choice for adding more weight to the system.

What we don't like

  • It is £5.49 above the cheapest pick without a clearly unique listed specification to explain the difference.
  • The enclosure and underseat or boot dimensions still need checking, even where the product is described as compact.
Price£49.99
AvailabilityIn stock
Listed Power1200W
ModelJS10
Size10 inch
Warranty1 Year Warranty
BrandJuice
Bundle OptionsSub Only, Add Compatible Sealed Enclosure, Add Compatible Ported Enclosure, Add Compatible Sealed Enclosure and Amp, Add Compatible Ported Enclosure and Amp
Product TypeSubwoofer
Shipping Weight5 kg
Check CarAudioCentre.co.uk
Juice JS12.1 1400W 12" Single Voice Coil 4 Ohm Subwoofer Bass Driver

Best for boot-based systems

Juice JS12.1 1400W 12" Single Voice Coil 4 Ohm Subwoofer Bass Driver

A 12-inch bass subwoofer choice for adding more weight to the system.

What we don't like

  • It is £5.49 above the cheapest pick without a clearly unique listed specification to explain the difference.
  • The enclosure and underseat or boot dimensions still need checking, even where the product is described as compact.
Price£49.99
AvailabilityIn stock
Listed Power1400W
ModelJS12
Size12 inch
Speaker DesignComponent
Warranty1 Year Warranty
BrandJuice
Bundle OptionsSub Only, Add Compatible Sealed Enclosure, Add Compatible Ported Enclosure, Add Compatible Sealed Enclosure and Amp, Add Compatible Ported Enclosure and Amp
Product TypeSubwoofer
Shipping Weight5 kg
Check CarAudioCentre.co.uk
Pioneer TS-A30S4 12" A-Series Component Subwoofer 1400W MAX

Best for factory stereos

Pioneer TS-A30S4 12" A-Series Component Subwoofer 1400W MAX

A 12-inch bass subwoofer choice for adding more weight to the system.

What we don't like

  • It is £20.49 above the cheapest pick without a clearly unique listed specification to explain the difference.
  • The enclosure and underseat or boot dimensions still need checking, even where the product is described as compact.
Price£64.99
AvailabilityIn stock
Listed Power1400W
ModelTS-A30S4
Size12 inch
Speaker DesignComponent
BrandPioneer
FeatureSingle Voice Coil
Power Detail4 Ohm
Product TypeCar Subwoofers
Size Detail12 inch
Check CarAudioCentre.co.uk
Kenwood KFC-PS2517W PS-series 25cm subwoofer

Best for stronger low end

Kenwood KFC-PS2517W PS-series 25cm subwoofer

A 10-inch bass subwoofer choice for adding more weight to the system.

What we don't like

  • It is £20.49 above the cheapest pick, so the higher price depends on whether the distinct 2517W power suits the installation.
  • The enclosure and underseat or boot dimensions still need checking, even where the product is described as compact.
Price£64.99
AvailabilityIn stock
Listed Power2517W
Rms Power400W
Size10 inch
Speaker DesignComponent
BrandKenwood
Frequency RangeBroad response from 27 Hz to 300 Hz , capturing low-frequency sub-bass drops effectively
Impedance4 Ohms single voice coil configuration, allowing for straightforward wiring with most mono or bridge
Power Handling400W RMS (Continuous Power) with a peak input handling capacity listed between 1300W and 2000W depen
Product TypeCar Subwoofers
SensitivityRated at 83 dB , meaning it responds well to proper, clean amplification
Check CarAudioCentre.co.uk
In Phase XT-10 Kevlar Cone 2 Ohm Dual Voice Coil 1200W Peak Power Subwoofer

Best for flexible installation

In Phase XT-10 Kevlar Cone 2 Ohm Dual Voice Coil 1200W Peak Power Subwoofer

A bass subwoofer choice for adding more weight to the system.

What we don't like

  • It is £25.49 above the cheapest pick without a clearly unique listed specification to explain the difference.
  • The enclosure and underseat or boot dimensions still need checking, even where the product is described as compact.
Price£69.99
AvailabilityIn stock
Listed Power1200W
ModelXT-10
Warranty2 Year Warranty
BrandIn Phase
FeatureDual Voice Coil
Power Detail2 Ohm
Product TypeCar Subwoofers
Shipping Weight5 kg
Size Detail10 inch
Check CarAudioCentre.co.uk

Buying guide

What to check before ordering

Start with the space available, then compare RMS power, enclosure type and input options. A factory stereo may need high-level inputs or a line-out converter, while a passive subwoofer needs a separate amplifier.

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.