Best answer by Airgetlam
How do you have the original AudioSource AMP100VS connected to your CONNECT? Obviously not via the RCA, otherwise you wouldn't be able to add the second.
But no, I wouldn't think there would be any delay between whatever output you're currently using and the RCA output. The delay that needs to be considered is when getting sound "in" to the CONNECT.
Or am I misunderstanding what you mean by "the 1st amp"?