I really feel like a total idiot but it's been over ten year since I had Circuit City install an Alpine stereo in my extended cab. I always assumed the front speakers were working until the other day I stuck my head up in the window and listened. The front speaker are dead, so I pulled out the owners manual for the Alpine. I found out that it only has a front, rear, and sub channel. When they installed it they used an adapter plug to make it work so I just thought the dash was tied into the door speaker. Does anyone make a aftermarket radio that has a front, center, rear, or something to that effect? Or do I have to splice the dash and door speakers together?