I was thinking in more simple terms John where a hump or dip in a frequency response will produce a different dB level compared to the dB with the same power given to the 1kHz; but yes it makes sense that the overall sum of SPL would total that of the highest dB at whichever frequency that may be.
The sum dB of all frequencies are not additive and cumulative otherwise our ears would be in big trouble.


"Those who preach the myths of audio are ignorant of truth."