Hi...I have the same PH 3SE but with the ARC LS 25 line stage. I have a Helikon also. I set my line stage pre-amp to the "high" level (there are 3 on the 25) and I usually set the volmne control on the 25 to about 1-2PM.....and the volumn in my room is more the fine. It may be something with your Classe?? Check the ARC web site for the level controls on the LS 25....I believe they are quite high and when mated with the PH3 it is enough for mid-output MC's.
I hope that helps....
Rick
I hope that helps....
Rick