Constant on-axis response forces total radiated acoustic power to fall as directivity Q rises.

Evidence

Equation 6.13 shows that in order to achieve a constant direct sound response, the power radiated by the source must reduce as the Q increases. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 1809

Categorization

• XREF: Connects to the inverse relationship between Q and radiated power derived just above; a core psychoacoustic design trade-off.