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Black In Phase XTB-828R underseat subwoofer with red trim, textured casing, and control panel on the side.

In Phase XTB-828R Underseat Subwoofer

by In Phase

£135.42from 3 retailers

The In Phase XTB-828R Underseat Subwoofer offers deep bass and high power handling in a compact design, perfect for enhancing your car audio experience.

GTIN05060801411080
EAN5060801411080
MPNXTB-828R
Prices updated 7 Jun 2026

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Product Description

The In Phase Car Audio XTB-828R Underseat Subwoofer is a passive radiator equipped active sealed subwoofer enclosure. Hit really low frequencies and experience true bass accuracy not normally found in bog-standard active subwoofer. Equipped with an all weather glass fibre woven cone 20cm (8") drive unit. paired with a passive radiator in sealed enclosure technology. it provides deep and controlled bass frequencies. Its built-in 400W class D amplifier offers high power handling and numerous controls.XTB-828R has high and low level inputs that can be plugged with after market and OEM headunits.This FOUR-in-one enclosure reduces overall dimensions while offering a great bass level. This comes complete with a wiring kit apart from RCA cables. If fitting to an aftermarket headunit. you will need RCA cables

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