upgrading speakers in boombox?

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Hi,
Has anyone upgraded the 3.5 [9mm] speakers in their boomboxes?
I have a new JVC that plays cass, CD, and MP3 CDs, very handy, and
sounds terrible.
I mean even the cheapie RCA boombox I got for work for 30$ sounds
better. The JVC are 4 Ohm driven by a huge 2 watts. I was wondering if
sticking some upgraded spks in there
might help it out, since they can be had for about 20$ and the
dissassembly
looks simple.

Thanks,

itchy