[sanmiam]

OK, as for infiniti and Polk, infiniti  speakers seem to have a "crisper" sound than polk, which I would compare to a pioneer while the sound of an infiniti speaker would be much less "washed out" (let me add that I have a set of polks and LOVE them, just depends on your tastes) On that note, the sub is a different story, if you are going to by an infiniti perfect, more power to you, it is one of the best sounding sbs I have ever heard, but if you are going to go with the reference series I would suggest something else.  Personally I am not impressed with the entry line subs for either infiniti nor polk, so if the cheep route is the one you are going I would suggest neither, and personally would try to find an entry level JL to go with.  Matching up the brand of subs and speakers is one thing if you are going to be showing the car, or if you are sponcered or something, but if you are looking for the best overall sound for less money, you may need to hit up a couple different companies in your system.