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My XK8 only has the standard audio system so no rear subwoofer. I like a bit of bass thump so I decided to look at some options. In the end I went for an under-seat sub which as luck would have it fits quite neatly behind the rear seat cushion (there's not enough clearance under the front seats). I removed the rear seats and the back rest to find there's a handy shelf that the sub can sit on. No need to secure it as once the seat is back in place it will be held firmly in place by the seat foam. Pretty straightforward to fit and it works reasonably well for a £90 sub and hides away nicely.