^ Jerry told me that the output on the Aerco can put out 20 V peak-to-peak (+/- 10).
I don't know if this is of any help, but what type of gain do you have on your Aerco? In my experience (and confirmed by Jerry), the values printed on the labels only apply to the Aercos with stepped gain switches. If you have the continuously variable gain pots, those numbers don't apply and, additionally, the gain is not linear with the degrees of rotation of the knobs (if I recall, the changes get larger as you get towards the higher gain end). Maybe worth checking to see if you were actually applying the amount of gain you intended?