I officiate both basketball and volleyball, and use both the Fox Classic 40-CMG and Mini-CMG. Both seem to work just fine & I have never had a problem being heard with either, but I've been told that my whistle definitely is on the loud side....
The Classic is noticeably louder, and for basketball in a loud, crowded gym it's what I prefer, but aside from those situations I mostly use the Mini - probably 75% of the time. The Mini is more comfortable for me, and my whistle of choice for volleyball.
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