Hey guys, yes it has an ''imprinted'' poweramp response curve from the poweramp section of the amp. Some of these impulses have different poweramp used ('95 2 chan dual rec, Orange rockerverb, 5153 III, 6505, etc, it depends.) I think going through the return loop of the amp (by-pass the preamp section) and then having the cab connected to the head like a normal setup is the best way to take cabinet impulses. I havent heard of any other way to do it (that sounds great and that doesnt damage the equipement).