I just had my stereo system upgraded this week and here's what I went with:
Left stock Bose speakers in place
Upgraded non-nav bose head unit with Pioneer AVH4400 DVD unit
Added a JL Slash 500/1 amp along with an Alpine Type-R Shallow Mount 12" Sub in a .6 cubic foot box stuffed with Polyfill.
I am amazed at the SQ. The head unit alone really, really cleaned up the Bose speakers. I have had Bostons, MB Quart, etc in other vehicles and find the setup I went with totally clean sounding. The amp was installed behind the passanger seat and the install looks really clean. Also, just a warning for others with the roadster...the sub can barely be noticed with the top down, but top up it hits super hard. Guess it's too much sound deadening with the top in between the cabin and trunk.
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