I'm thinking of selling my rear speakers fitted to the rear boot cover. The bass drivers are 6" Yamaha professional studio units, cost £75 each and Bang and olufsen 1" round dome tweeters. It also includes a Hifi Crossover. Its not very neat under the shelf but it looks fine from the 'outside'.
The bass drive units are usually used in Yamaha NS10 Studio monitors:
This is serious sound quality with fair volume. Comes with acoustic damping for the bass units.
Photos soon, serious offers only.
London area