I think it depends not just on the check mechanism itself but the body weight and especially shape of the reel - or maybe that is obvious. The lightweight series of Hardys, especially the st. Aidan, and I recently realized the st. Andrew, are extremely loud. I think it might have to do a lot with the large, relatively thin face. Maybe it acts a little like a drum, or the shape of a violin. But at any rate while the st. Aidan (and possibly the St. John which is not exactly one of the lwt line, but maybe has a somewhat more similar face and construction) are as loud, if you compare them side by side the Perfects alway have a lot more low frequency components. Both low and high balance are sexy in their own way, but the low stuff in the Perfects is what gets people comparing the sound to the growl of a “big cat”. The St. Aidan when it is screaming sounds a little more like the buzz of large, angry, but extra-scary insect. Maybe like a 2 ft wide cicada. :chuckle:i have the Bougle IV, newer version, and a St John MkII - the St John is a much louder clicker.