I bought a used Mackie 1400i power amp, and it seemed to work fine, but i think their maybe something wrong with it. I have a Peavey Pro 410 (700watts, 8 ohms) and a 1x15 w/ an Eminence Legend (300watts, 8ohms). I am using a Peavy RAXX Preamp. The problem is that whenever i try to push the amp loud i get the internal short light coming on when i peak out. I was wondering if any of you guys have had this problem? I have tried it in a couple of different modes: Bridged at 4ohms, Both Cabs Bridged at 8ohms, Peavey Pro Mono at 8ohms, Peavey Pro Mono at 4ohms, Both cabs the mono at 4ohms gives me the most volume. I am wondering if their could be a problem with my amp, or if i am just trying to push it to hard.