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I knew the academic definition of crest factor but wanted something which applied it to music and provided some numbers which might aid the design team. Here is a piece I researched today:
https://www.mc2-audio.co.uk/wp-content/uploads/mc2_crest_factor_and_amp_power.pdf
In it it says:
When specifying a system -(DPG's earlier point) , it is important to not only know the dynamic performance and limits of the loudspeakers and the amplifiers, but also the expected signal type to be used. Please bear in mind that any signal source that has a lot of constant tones (CF between 3.0 and 1.5) will require twice as much available power than a typically ‘heavy’ dynamic music signal (CF between 3.0 and 5.0), and about ten times the power of a system mainly used for speech and ‘light’ music.
Thus it seems to me that one would need to determine the range of crest factor of the bass music to be amplified before designing the amplifier. This may require different selectable modes by the power supply for classical, pop, heavy metal, jazz.....
https://www.mc2-audio.co.uk/wp-content/uploads/mc2_crest_factor_and_amp_power.pdf
In it it says:
When specifying a system -(DPG's earlier point) , it is important to not only know the dynamic performance and limits of the loudspeakers and the amplifiers, but also the expected signal type to be used. Please bear in mind that any signal source that has a lot of constant tones (CF between 3.0 and 1.5) will require twice as much available power than a typically ‘heavy’ dynamic music signal (CF between 3.0 and 5.0), and about ten times the power of a system mainly used for speech and ‘light’ music.
Thus it seems to me that one would need to determine the range of crest factor of the bass music to be amplified before designing the amplifier. This may require different selectable modes by the power supply for classical, pop, heavy metal, jazz.....