I was very pleased with the sound quality when I ditched the WAVE cassette HU and fitted a BOOST CD HU (bought from Tony *t3 in the FOR SALE forum at a giveaway price a coupla months ago). The difference between the two is very noticeable.
The BOOST HU is more powerful and goes plenty loud enough for me. With the fader slightly biased towards the rear I get decent bass and the quality is as good as I want or probably need.
Mike (
www.newministuff.com) supplied all the leads. Get all the leads you need from him.
He's been doing MINI community service for ages
(or should that be providing a service to the MINI community for ages)