Can a coach use a megaphone?

[BillyMac]

Originally Posted by Mark T. DeNucci, Sr.

... there is a late 20th Century Casebook play that allows for the John Wooden mini-megaphone.

10.1.3 SITUATION A: Team A’s coach: (a) uses a megaphone or an electronic amplifier to shout instructions to players;
RULING: A team technical is charged in (a), The team technical counts toward reaching the bonus, but is not charged to the head coach.
In (a), the use of a rolled up program would be legal.

Also:

2001-2002 NFHS Interpretations SITUATION 6: The school-sponsored cheerleaders wish to use megaphones as part of their cheerleading routines from the sidelines. RULING: The new rule prohibiting artificial noisemakers would not apply to the cheerleaders in this situation. The megaphones would only be legal for the cheerleader’s use, provided they were being used appropriately. (1-18)