Having looked at your amps features, it seems it has three types of power on capabilities: delay on (3-15 seconds), signal sensing, and 12v trigger. The delay time won't be of use but you are saying that you are having problems whether it is in signal sensing and 12v trigger mode? Is it the amp that is going into standby only or is the Outlaw 990 turning off as well? I would connect your amp via the trigger 1 of the Outlaw vs. the singal sensing. It could be the amp is very sensitive to quiet passages and its signal sensing circuit thinks you turned off the power to the Outlaw. Three seconds is very fast for signal sensing to turn off an amp. Even my Velodyne doesn't shut off until it doesn't "hear" a signal for 15 minutes and even then, when a signal reappears, it automatically turns itself back on immediately.

Slbenz