I too am interested in how to make the stock Bose sound a bit better.
I had a Bose in my RX-8, and it sounded great. I have a Bose in my Mazda3 HB, and it sounds good. I have the Bose in the Z, and it sounds just slightly better than crap. Obviously, the acoustics of these cars is different, but I suspect a decline in quality over the years.
I'm not enough of an audiophile to change the HU. I might consider changing speakers. I have found that I can get a much better sound by fading the speakers more to the front (surprisingly, at least to me, I get more out of the spare-tire mounted sub this way).
I listen to mostly rock.
Anybody play around with the fade settings for better sound? Got a recommendation for replacement speakers?
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Rain, snow, sleet, hail: 2009 Mazda 3 sGT HB
Everything else: 2009 370z, PW Touring 6MT