I have a jbl 600.1 and it has a red and green light on it. while it's on and running fine the green light is on but when I turn it up loud my subs stop and the red light turns on and the green light shuts off. it only does it for about 2 secs but it does it a couple times each song. what is this?
Something is loose, ground, power. Wiggle the wires- its the only way to check a solid connection.
Pat's right about this one, I have a real strong feeling it's a loose connection, in your wiring check every connection twice, from your battery all the way back to your speakerbox, defiantly your ground would be the very first i'd check