"Countdown" allowed or not?

[chseagle]

Concerning countdowns, the past couple of games I've done as shot clock operator in the main gym, it was at the officials' request that the countdown be done under 10-sec. on shot clock. This is done in case the shot clock buzzer goes off for shot clock violations so the timer can buzz as the shot clock buzzer isn't heard that clearly when the crowd is boisterous.

However, the only ones I hear doing the regular clock countdown are fans, coach(es), or teammates.