Re: DW9002 beater position
Of course no one has mentioned "negative beater resistance". That would be the other difference between a 90 deg and a 45 degree static beater setup, with the 45 deg option having the spring become tensioned a second time, as the beater rebound passes the apex position (the position where the spring is perfectly vertical, and hence has it's shortest length), the spring now pulling the beater TOWARD the drum head.
I would imagine this is not a big difference, since the beater may not travel that much past the 45 deg apex. Although a video would tell... calling all drummers, all drummers with double pedals, please go forth and produce videos!!! LOL
Right handed, traditional grip, jazz player
Pearl Reference kit with Pearl rack