Just wondering if anyone has any experience with these as far as sound quality?
The Kenwoods have a broader frequency response:
Kenwood KFC-P708 P Series 6-3/4" component speaker system For 6-1/2" and 6-3/4" openings at Crutchfield.com
The Polks have a slightly higher db sensitivity:
Polk Audio MM6501 6-3/4" component speaker system at Crutchfield Signature
Thanks for any info. None of my local stores have either of these set up for me to listen to.