CACar Audio Guide UK

UK car audio comparison

Best Shallow-Mount Car Speakers
in 2026.

A practical comparison of car speakers using size, design, power handling and the fitment checks that matter in a real vehicle.

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 KFC-S1766 Stage Sound Series 17cm Flush Mount 2-Way 2-Speaker System

A coaxial option for making a factory system clearer without changing the whole car.

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 TypeSpeaker DesignSizeListed PowerRms PowerTypeShipping WeightFull specifications
Kenwood KFC-S1766 Stage Sound Series 17cm Flush Mount 2-Way 2-Speaker System£28.89In stockKenwoodNot listedNot listedCar SpeakersCoaxialNot listed300W30WDoor SpeakersNot listedAll listed fields are shown
In Phase SXT1735 6.5" Shallow Fit 16.5cm 3-Way, 260 Watts Coaxial Speakers with Neodymium Magnet£33.50In stockIn PhaseSXT17352 Year WarrantyCar SpeakersCoaxial6.5 inch260W40WDoor Speakers1 kg
  • Size Detail: 6-6.5 inch
In Phase SXT1035 - 2-Way Coaxial Shallow-Mount Speakers - 200 Watts£39.99In stockIn PhaseSXT10352 Year WarrantyCar SpeakersCoaxialNot listed200W30WDoor SpeakersNot listed
  • Size Detail: 4 inch
In Phase SXT1335 - 13cm shallow mount 3-way coaxial speakers - 230 watts£39.99In stockIn PhaseSXT13352 Year WarrantyCar SpeakersCoaxialNot listed230W35WDoor SpeakersNot listed
  • Size Detail: 5.25 inch
BLAM Signature S BL-S6.45 6.5” Slim/ Shallow Fit Mid-Bass Speakers (Pair)£452.99In stockBLAMBL-S6.45Not listedCar SpeakersCoaxial6.5 inch80W80WCoaxial SpeakersNot listedAll listed fields are shown

Product notes

What each pick is best at

Kenwood KFC-S1766 Stage Sound Series 17cm Flush Mount 2-Way 2-Speaker System

Best overall speaker upgrade

Kenwood KFC-S1766 Stage Sound Series 17cm Flush Mount 2-Way 2-Speaker System

A coaxial option for making a factory system clearer without changing the whole car.

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 fixed coaxial layout offers less placement flexibility than a component set, and the speaker size and depth still need measuring.
Price£28.89
AvailabilityIn stock
Listed Power300W
Rms Power30W
Speaker DesignCoaxial
BrandKenwood
Product TypeCar Speakers
TypeDoor Speakers
Check CarAudioCentre.co.uk
In Phase SXT1735 6.5" Shallow Fit 16.5cm 3-Way, 260 Watts Coaxial Speakers with Neodymium Magnet

Best for clearer front sound

In Phase SXT1735 6.5" Shallow Fit 16.5cm 3-Way, 260 Watts Coaxial Speakers with Neodymium Magnet

A 6.5-inch coaxial option for making a factory system clearer without changing the whole car.

What we don't like

  • It is £4.61 above the cheapest pick, so the higher price depends on whether the distinct 260W power suits the installation.
  • The fixed coaxial layout offers less placement flexibility than a component set, and the speaker size and depth still need measuring.
Price£33.50
AvailabilityIn stock
Listed Power260W
ModelSXT1735
Rms Power40W
Size6.5 inch
Speaker DesignCoaxial
Warranty2 Year Warranty
BrandIn Phase
Product TypeCar Speakers
Shipping Weight1 kg
Size Detail6-6.5 inch
TypeDoor Speakers
Check CarAudioCentre.co.uk
In Phase SXT1035 - 2-Way Coaxial Shallow-Mount Speakers - 200 Watts

Best coaxial-style upgrade

In Phase SXT1035 - 2-Way Coaxial Shallow-Mount Speakers - 200 Watts

A coaxial option for making a factory system clearer without changing the whole car.

What we don't like

  • It is £11.10 above the cheapest pick, so the higher price depends on whether the distinct 200W power suits the installation.
  • The fixed coaxial layout offers less placement flexibility than a component set, and the speaker size and depth still need measuring.
Price£39.99
AvailabilityIn stock
Listed Power200W
ModelSXT1035
Rms Power30W
Speaker DesignCoaxial
Warranty2 Year Warranty
BrandIn Phase
Product TypeCar Speakers
Size Detail4 inch
TypeDoor Speakers
Check CarAudioCentre.co.uk
In Phase SXT1335 - 13cm shallow mount 3-way coaxial speakers - 230 watts

Best for tighter budgets

In Phase SXT1335 - 13cm shallow mount 3-way coaxial speakers - 230 watts

A coaxial option for making a factory system clearer without changing the whole car.

What we don't like

  • It is £11.10 above the cheapest pick, so the higher price depends on whether the distinct 230W power suits the installation.
  • The fixed coaxial layout offers less placement flexibility than a component set, and the speaker size and depth still need measuring.
Price£39.99
AvailabilityIn stock
Listed Power230W
ModelSXT1335
Rms Power35W
Speaker DesignCoaxial
Warranty2 Year Warranty
BrandIn Phase
Product TypeCar Speakers
Size Detail5.25 inch
TypeDoor Speakers
Check CarAudioCentre.co.uk
BLAM Signature S BL-S6.45 6.5” Slim/ Shallow Fit Mid-Bass Speakers (Pair)

Best high-output option

BLAM Signature S BL-S6.45 6.5” Slim/ Shallow Fit Mid-Bass Speakers (Pair)

A 6.5-inch coaxial option for making a factory system clearer without changing the whole car.

What we don't like

  • It is £424.10 above the cheapest pick, so the higher price depends on whether the distinct 80W power suits the installation.
  • The fixed coaxial layout offers less placement flexibility than a component set, and the speaker size and depth still need measuring.
Price£452.99
AvailabilityIn stock
Listed Power80W
ModelBL-S6.45
Rms Power80W
Size6.5 inch
Speaker DesignCoaxial
BrandBLAM
Product TypeCar Speakers
TypeCoaxial Speakers
Check CarAudioCentre.co.uk

Buying guide

What to check before ordering

Measure the original speaker opening and mounting depth. Compare RMS power and impedance with the existing stereo or planned amplifier, and check whether grilles, tweeters or crossovers are included.

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.