Chuck,
I played around with my car stereo for a while now and
this is what I have learned:
4 " speakers cannot reproduce reasonable base. So you
need something bigger to get decent sound.
I tried 6x9" speakers in the front doors, but that was
not a good idea. There is no way to make the front
doors stiff enough for base under 100 Hz and I could
not find a way to stop the doors from making rattling
noises at certain frequencies, which is VERY annoying.
For the base I settled for a mono subwoofer under the
rear bench, JL Audio 10W0, in a custom enclosure. It
is easier to keep the rear bench from rattling. The
woofer is driven by a MTX TA 311D amplifier. Max power
is 200 W RMS nominal but it has actually 283 W, MTX
always underrates their amps.
In the front I have a component system JL audio
XR650-CSi, with 6.5 " mids and tweeters that can be
swiveled and rotated. The crossover to the sub is set
at 85 Hz, so the doors are quiet now. The JL's are
pretty high end speakers, and if you want to hear the
difference, you need to mount them right. The 6.5" are
low in the door. The key is they are mounted on a
rigid particle board which is shaped to fit inside the
door and provide an even mounting surface. Also
important is to have no openings around the speaker
and damp the door panels with QPads or brown bread or
similar. The component speakers have separate
crossovers mounted behind the glove box. The tweeters
need to be higher up, or your music will seem to come
from your feet. I put them into the stock speaker
positions, actually in the stock speakers, after
dremeling all the old stuff out. This takes a few days
to complete. If you don't want to spend the time,
though, there is no point in spending the money for
top speakers like JL ausio or MB quarts, because they
are going to sound no better than much cheaper
speakers if not properly mounted.
My headset is pretty simple, a Sony CDX-CA810X.  I
bought it, because it has a decent equalizer (7 band)
and fits easily. It has problems with shocks, though.
Bumps in the road sometimes kill the music for a few
seconds.
Oh, and some rear speakers to fill in the frequency
response top it off.
If you like I can post a few photos of the job.
Have fun,
Reinhard, 83 Westy, "Moose"
--- Chuck Reisinger <chuckphoto@EARTHLINK.NET> wrote:

> Time for the AM/FM Cass to go....I want to install a
> new CD and new front/rear 4" speakers in my 89
> Westy....so far the two estimates where over $550.00
> installed...this seems high to me...two
> questions...what brand CD and speakers would YOU
> install in YOUR...and...is installation pretty
> straight forward....Thanks....Chuck....
>

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