The amp outlet is just on a delay to prevent the pop you might get, no trigger.

The 3500 has a total of 10 outlets, 2 are swithced, 2 are on a delay, 6 are unswitched, always on. I use the unswitched for cable box, game systems, CD, DVD players etc. I only use the delay for the amp and the switched for the pre as Monster recommends.

I never had the buzzing sound that I do now. The only thing I changed out was the Blu-ray player.