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Class D music amplifier loading?

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Faringdon:
Hi,
Do you agree that for a Class D amplifier being used at a thrash metal concert at full power...the power draw of the Class D would be going from no load to full load multiple times within any 5 second interval?
And that it  would never be on constant load?
Consider for Bass Amp and 6string guitar amp.

A Bass guitar is from 40Hz to 4000Hz......T(40Hz) is 25ms......so in fact, for a Bass Class D amplifier at 40Hz (low E string),  the power draw of the class D amplifier must go from no load to full load within that 25ms period?

Surely this must be so.....its impossible for music (even explosively loud thrash metal) to avoid regularly returning to "no load", since the whole situation of music is the difference in the loudness over millisecond intervals?...so over a 1 second interval, the class D must have multiple no load intervals?

langwadt:
instead of making silly "do you agree" statements based on nothing, why don't you just load some of your imaginary "trash metal" into an audio program and look at the waveform .....

Circlotron:
With a class D amplifier you can get negative power consumption during part of the cycle e.g. when the amplifier damps the moving speaker cone the kinetic energy is turned back into electricity by the voice coil and magnet and this energy is then returned to the PSU filter caps. Same deal as regenerative braking in an electric car.

T3sl4co1l:
They're mostly powered by single phase mains, anyway; the input power returns to zero a hundred or more times a second already.


Actually I don't know that the really big wall-of-sound installations are single phase, they might have some industrial grade systems to help out there.

Tim

Zero999:
Other than the usual power fluctuation throughout the mains cycle, no. There will be lots of filtering, with big smoothing capacitors and a large installation will probably be run off a power factor corrected power supply.

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