I have to agree with Duane. I feel that it would just provide lots of noise (like fingernails on a chalkboard).
Now if you want to devote a chapter of your life to crossover development you could remove those Polks and replace them with these:
http://www.partsexpress.com/pdf/290-401.pdf I have been there and it's a lot of work.
maybe 40-60 hours of testing before I got something that I am happy with.