Bit of a beginner question....

I've been looking for one of those 'under cupboard' CD-radio units for ages
and just can't find one for sale in the UK. I thought the other day that it might
be possible to fit a car CD player to the underside of a kitchen cupboard and
place some speakers but I don't know if this is sensible.

Any opinions? Do they require a separate amp or can I just wire them directly
to speakers?

Cheers
Ronnie