I have just sent email to MTX. They are sold at Circuit City (Where I got the Polks). I am asking MTX for info. The clarity of the Polks are great BUT "lite" on the bass. I question now on Honda's RMS ratings. My system is suppose to be 180 watts. Given the factory speakers it was pushing that may be true. But I think that the system is no where near 180 watts. Therefore, I question Hondas claim that the 08 Accords are pushing 270 watts.