>Wrong.  Power is not cumulative, and no amps in existence will take the 
ull
 >30W input (there are technical reasons why a deck couldn't drive 30W into 
n
 >amp anyway -- wattage depends on the impedance of the load; do some reading 
on
 >Ohm's Law).  
     It'd take more than ohms law.  Actually, I can tell you all there
is to know about ohms law.  V=IZ.  That's all there is to it.  Some
reading on KVL, KCL, how loads combine and especially transistors would
be much more helpful.  Then again, I have a degree in Electronics and
I still wouldn't call myself an expert on amplifiers.
 >Yes they would, although they're generally not recommended for high-end
 >systems; their shape is far from "friendly" when it comes to accurate audio
 >reproduction.  6x9s are an abomination designed to squeeze more speaker 
nto
 >wide but shallow rear decks of most cars in the 60s and 70s.  For a quality
 >system, you're likely going to be doing a custom mounting job anyway, 
ather
 >than just bolting them into the car's existing cutouts, so there's little
 >point in wasting your money on 6x9s.
     I disagree to a certain extent.  If your goal is simply
reasonably loud decent quality sound, there are some 6x9s that do the
job quite well.  Blaupunkt's 6x9s sound very nice.  We're not talking
"high end," but then most car systems don't approach that anyways due
to the environment.  However, they're a huge improvement over most
factory systems, including some JBL and Bose crap I've heard in
Lincolns.  Check out the August Stereo Review's opinions on Blaupunkt
6x9s.  They measured pretty flat (+2.75dB on axis).  That's better
than most home speakers.  Of course that doesn't tell everything, but
mine sound pretty good to me for the car environment and I didn't have
to bother with a custom installation.  I certainly wouldn't call them
an "abomination."  Like all things, some are better than others.
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