Yes, especially indoors. Boomer's volume can be set using the volume knob to be quieter than a normal match between two humans. However, this is often too loud for some people (robots get no respect) so we have an optional speaker which can be placed on the user's side of the court to eliminate this problem. Because the optional speaker is very close to the user, it can be set low enough to avoid bothering adjacent courts, yet plenty loud enough for the user to hear clearly.