Something that will give all the speakers a workout. You can use favorites as long as they're good quality. I use whatever's in the CD player or on the USB stick.

Having "reference" CDs or tracks is nice, although tuning with what you listen to most will give good results, too.

edub... any updates on this setup??? I'm looking at doing something active possibly since I will have the enough amplifiers to get it going...

Since i posted in this thread I have sold and repurchased this jeep. So not much progress has been made. Ive done a little more tuning and playing with crossover settings. It sounds less harsh on the top end. This has become my girls car so won't get much else done. I'm going to replace the 15 with a single 12 box to save space, and I'll deaden, seal and mlv the front doors. Then it's on to my Cadillac build.