Yeah I'm running two amps. I posted an install thread in this forum last year. One amp for the main speakers and one for the sub. All Infinity except the head unit which is Alpine. That way the infinity logos from the original audio all still match what's in it. My OCD in play.
I'm a bit of an audiophile. Believe me when I say it sounds awesome. Damagingly loud with no distortion.
Problem is, at least until I get my new tires, all of the ambient noise I was getting from the truck itself required me to turn it up so loud, it was too loud to enjoy. I've been on a mission to "stealth" (verb) the truck so I can actually enjoy the audio.
New air box, new AC compressor, trans service. It's a totally different beast now. Picking up new rims this weekend. Slapping new Defenders on and then only the 5" exhaust note will be there.
I replaced the windshield wiper unit today after work. I started it up after I was done and was shocked at how quiet it is now (Only the second time since replacing the snorkel). It's amazing how much noise a problem accessory or air intake can create.
I used components up front and did away with the center speaker. The stock set up is wired in a way that it takes the + from one side and the - from the other. The new setup doesn't need that center speaker.