Well seeing that i've experienced quite a bit with the zx2500s, i can tell you something about these zx models. They don't like 1ohm unless you have the backup. When i say backup, it means a HighOutput Alternator. I had a redtop upfront, big 3 done, 1/0 throughout car, yellowtop in the trunk, and the zx2500 didn't like it @ 1ohm. It goes into protect when you raise the volume higher. When you roll it back down, it play fine. but once you turn it up, it goes in and out of protect. I decided to throw on another yellowtop, so the total was two yellowtops, redtop, and stock alt. It held a bit longer, but the amp still went into protect. So unless your getting a HO alternator to keep up strong voltage, don't bother running your zx1500 @ 1ohm. you'll thank me later when you saved your amp from frying. The amp is strong at 2ohms. I thought to myself " imma lose alot of power wiring this amp to two ohms. I usually like to wire my amps lower to compensate for boxrise/resistance, but unfortunately this amp made me run it at 2ohms. I was impressed at how much output this amp has at 2ohms nominal