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My bad, wrong casual terminology.
Its 250 watts long term maximum power (IEC 268-5 18.2)
-100 hour RMS – 100 hours with continous signal. o (IEC 268-5, cl 18.4 Rated noise test)
-Long Term Power Handling – 10 times alternating between signal for one minute and pause for 2 min. Total test time is 28 min. o (IEC 268-5, cl 18.2)
-Short Term Power Handling – 60 times alternating between signal for one second and pause for 1 min. Total test time one hour. o (IEC 268-5, cl 18.1)
The test signal is a weighted (IEC 268-1) pink noise signal with a crest factor of two.
I have no doubt the signal is filtered, but not sure of precise range.
What needs to be borne is the nature of music and its actual RMS (heating value) is very low compared to the peak. Typically 1/5th.
FYI, IEC 268-5 specifies a pink noise test signal with a crest factor of 6dB that is highpass-filtered 12dB/octave at 40Hz and lowpass-filtered 12dB/octave at 5kHz.