I used to get compliments on the sound of just the two 12's. I didn't have the capacitor installed when I had the two 12's in and the alternator died, so I wonder if that could've caused it. Thing is, I also may not necessarily need to shell out the cash because I actually had a 200 amp alternator installed in my Cherokee but it hasn't been putting out even what the stock one was, so If I can send it back to the guy and have him send me one for the Z then I think I will.