FYI, for those people that have amps that do not have a trigger input, I found a $80 device that will give it to you for up to 1800 watts.

http://www.xantech.com/products/p_folder/p_ac1.htm

Passed it by Scott and he indicated it should work fine with the 990.

I am going to use it for my IB sub amp, a Behringer 1500.