FWIW:  I put a set of Boston Acoustics(4 of them) in the AC housing holes in
rear and stock holes up front.  Thefront grilles chafe the dash housing a
little but they sound so good, I'll tolerate it.  As far as subwoofer goes,
I bought a pr of Radio shack ported boxes for $5 a pr on closeout that
currently house 8" Rockford Fosgate subwoofers, driven by a 4x75 Rms R/F amp
under passenger seat with no cooling fan.  Also have SP-400 nakamichi's  on
the bottom of the doors.  Source material is a sony 10 CD changer.  Not to
start a stereo one upsmanship here, but for the $1,100 I have in this
system, I would bet few systems sound any better without substantial
increases in cost over that initial 1,100 bucks.  I'd rather hear my stereo
than the engine(burnt out from that driving a 79 for 12 years and yes, I
love music
Amp was 5 bills(and the soul of the system)
Sony was 3 bills
Nak's were 2 bills(discounted many years ago)
4  Boston speakers for a C-note on closeout
Dimwitted Moose and Flying Squirrel