How does everyone cover their rear speakers? im sure 4" is best to keep factory cover. 51/4 may be ok with factory cover also. I have a pair of Infinity 61/2's in the barn id love to use. After tearing out factory rears I was definitely undecided as to remove the metal (where do I mount speakers except in the plastic) or bore the hole larger in the metal. Also the area around the speaker cover area looks like a funny angle to try to put an aftermarket cover except maybe a 6x9 cover. Any input would be appreciated. Good luck to you guys installing those mondo systems as I kind of see now what youre going through! If all else fails im gonna go with a power converter and throw my whole Onkyo component set in with all 9 house speakers. LOL!