Is there anyway to modify your rear deck to accept 6X9s in a coupe, or is there some kind of article somewhere on how to do it?

 

if you go to this website.. www,flemworld.com it will show you pics of the whole mach 460 system.. i believe you can alter the back speaker board to accept them .. just remember that when you are fooling with the mach 460 you need 2 ohm speakers.. not aftermarket.. which are all 4.. you can use 4 but once you put the volume past halfway up.. the amps cut out..

 

I went the site, but I don't have the Mach 460. Just a Sony MP3 headunit and aftermarket speakers.