I have 2 6" spocks on my
Yamaha's and for the highest pitch drum I cut a 1 inch hole on the side of the shell. It really helped with pitch between the 2 drums.
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My Drums:
-14" Yamaha SFZ Chrome with Chrome Hardware
-6,6,10,12,13,14 Yamaha Tenors Silver
Sweetwater High School 2000-2003 Tenors
Director and Founder of Cobalt Drum and Bugle Corps
Yamaha, Innovative Percussion, REMO, XL