I have just completed a frame-off restoration on a '71 El Camino SS and am
trying to come up with a decent sound system, nothing fancy.  I am not going
to cut up the new dash (has an original AM radio) or the new door panels.
Last night I installed a Pioneer 4700 MP in a universal under-dash holder.
I like it a lot but the problem is the speakers.  I installed a pair of Sony
W4621 4x6 speakers and they are awful.  Unfortunately the original location
for speakers (under the dash pad at each end of the dash) can only
accommodate a very shallow 4x6 speaker.  Any suggestions for a better
speaker that will fit?  Is there a reasonably small sub with a built-in amp
that will connect to the head unit and carry the bass, and will this keep
the speakers from clapping out?

I'm not looking for big booming sound, but I do like volume without
distortion.  I also don't want to invest a lot because I won't be driving it
much.  Any suggestion would be appreciated.

Thanks,
Ron Griffith