I've only had it for a few weeks so I haven't experimented too much. With the B-52, I got the best sound with it just inside the hole on the front head. With the ATM we had it further in, about 8 inches from the beater head, and further to one side, pointing just slightly off axis to where the beater strikes. It was a huge 24" kick, lots of room to experment in there, but it was just a quick session. A lot of times with the kick, I just like to lay in in there on a pillow or something.
-jhe