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Amplifier Speed

For analog power amps should any consideration be given to the amount of time it takes for the music signal to travel through a amp's circuitry? For instance, if I'm bi-amping with two very different design amps can one amp "process" the music faster than the other, or is it just not an issue?
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Showing 3 responses by eldartford

eldartford
4,262 posts
 
In order for global feedback to work at all, propagation time through an amp must be a few degrees of phase angle for a 20 KHz signal. I suspect that there is little difference between amps.

Phase shift in the crossover would be more significant.
eldartford
4,262 posts
 
Slew rate (or rise time) is of no consequence for the LF audio amp in a biamp setup because the LF signal from the crossover has no steep wavefronts to be followed.
eldartford
4,262 posts
 
Onhwy61 and Sean...Although this "transit" or "propagation" time is not quoted in specs, and I for one have not measured it (although it would be easy to do) it cannot amount to more than a few degrees of phase shift for a 20 KHz signal, or else global feedback would be impossible.

Sean, you have a dual-trace scope. Why not give us some data.
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