In-car audio occupies two distinct worlds. One is about raw power, earth-shaking bass and accidentally setting off the alarms of cars parked nearby. That’s quite easily achieved: chuck a subwoofer in the boot and crank the volume. The other is about pursuing the kind of optimum audio quality you might have at home, and that’s a little more tricky. French audio brand Focal is well known for its high-end studio and home speakers (its floorstanding Sopra model will set you back around £16,000 a pair). In 2019 it launched a new speaker cone made out of recycled, non-woven carbon fibre that they dubbed the Slatefiber, and incorporated it into a couple of its popular hi-fi and studio monitors. Now it’s introducing them into cars, with these PS 165 component speakers and their co-axial brothers, the PC 165s. The eminently reasonable price (given their pedigree) puts them in direct competition with the JL Audios and Hertzes of this world. Focal Slatefiber PS 165, £239 The woo...