I actually called Crutchfield a couple of weeks ago and spoke to someone in the technical dept. I explained that their info for the 91 LS400 speakers was incorrect. They were going to 'look into it' and hopefully update their info. We'll see... I purchased Infinity 4" 42.7i Kappas for all for doors. I had to open up the each of the speaker enclosures in order to install the crossovers. They sound pretty good for $33 each from HookedOnTronics.com. They have decent bass, mid and tweeter. my .02