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In Reply to: Re: bel canto slew rate posted by rp1@surfnetusa.com on June 29, 2003 at 16:08:20:
This isn't exactly true, but 50V/us is a reasonable minimum for a 100W power amp. This is based on TIM distortion theory.
Follow Ups:
Thanks John. Was I close enough for government work though?I remember Scott saying something to the effect that to avoid TIM one had to make the input able to take twice the input voltage that is required for the full power operation of the amp? Do I remember it correctly?
I don't know, but I do know the measurements, Walt Jung, Matti Otala and I have made more than 25 years ago. We settled on 50V/us, or 1V/us for every output volt peak. So a 100W amp would have a +/-50V supply, and that makes 50V/us. This was found with difficult inputs, such as MC phono cartridges, but it would be the same today for SACD or DVD sources.
Is that because the dynamic range of microphones (and by extention,recordings) is so limited? In other words an amplifier does not really have to swing a rail-voltage through a 120db range but merely a 30db or at most a 50db range?
TIM is caused by high level, high bandwidth, pulses. These are generally formed by clipping somewere in the audio chain. When playing a record, it was caused by mistracking that happened all the time. It is difficult to get classical TIM with an ideal CD, but SACD and DVD will easily allow it.
TIM is only the primary reason for having higher slew rate. Actually, the whole circuit is improved, in general, by increasing the slew rate above a few volts/microsecond, where it is with the cheapest components.
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