The Morel UW1258
can handle 200W before reaching it's excursion limit.
5dB gain it's power input is multiplied by 3, and it therefore reaches
it's "system limit" at 200 / 3 = 65W.
The power handling
figures in the diagram below assume a system sensitivity of 87dB/2.83V.
content of music falls rapidly below 100Hz (typically 10dB less
at 50Hz), so from the diagram below, the overall power handling
be estimated as 200W, (23dBW relative to 87dB), producing 110 dB
power handling of the 18WU can be increased to 100W by inserting
a 1st order highpass filter at 60Hz, but this probably isn't