Nril makes the best point of all: Moving or Sitting Still.  If I'm in camp
and want good, loud stereo, I'll park next to Phil Zimmerman or Curt Long,
both with great sound systems.  If I'm on the road, traveling a great
winding back road I'll load the CD with the Eagles.
And Neil, you have a trained and professional ear, you are going to be a
much better critic of the quality of the sound coming out of any speaker
than I am, especially with my USMC issue ears that quit at about 8kc or
lower.  In fact the other day I walked up to an old shooting buddy of mine
(drove to the range in my Westy, content eh?) and noticed he now had a
hearing aide, not uncommon in old shooters.  I asked him how well they
worked, he said "They're great".  I asked him "What kind is it?" and he
replied "About 4:15"