Speaker Replacement for 2001 Tahoe w/ Subwoofer

Do you want a total aftermarket system, or are you planning on keeping what components from the factory?

Since you are going to the expense of replacing the factory sub, amp, and headunit, go ahead and replace the front speakers with a good aftermarket component set, which include the midbass, tweeter, and passive crossovers, and you could go with a good coaxials in the rear. Since you have infinity subs, I would replace the front speakers with infinity kappa components, and the rears with infiniry coaxials. Those twelves are gonna pound running off of that JBL, so I would plan on running the front and rear speakers off the headunit, but save and purchase a jbl four channel amp (25/50 watts x 4) later on down the road. With no speakers running off the Headunit, you could adjust the system, with the amps gains, to not distort when ran hard.

Yeah, they are what I used. Hit a deer last night, vehicle is toast. Try crutchfield, but I usually buy from an independant Audio shop, that deals with me, knowing that I will continue to purchase from them in the future.