Virtually all active (those with a volume control) computer speakers are 12 volt systems via a transformer from the mains.

Open up the speakers, snip the wires after the transformer, remove it and the amplifier is ready for a bike.

I used 3.5" waterproof speakers, which cost quite a lot (16.00) via esales@o-w-l.co.uk, who's based in Tamworth. Although the original speakers would work just as well, however with the British climate being what it is and me using the bike for work, rest and play

The MP3 holder was plastic heated to bend to shape, with QUIKSTEEL shaped to hold the mini-jack in place. This allows for quick removal when parking.

I made the speaker housings from Vacuum forming plastic which needs only a little heat to allow bending (an off-cut was obtained by the back door of a factory).

I made the amplifier housing to fit the left-side fairing pocket, but as so many others have done: it could be pre-set to a volume and secured anywhere around the bike.

For more information contact Boris Barker at: borisbarker@hotmail.com