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Tech Square Technical and speculative discussion of amps, cables and other topics. |
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Tech Square Technical and speculative discussion of amps, cables and other topics. |
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In Reply to: Perhaps a simple solution: posted by clifff on May 18, 2006 at 04:48:47:
If you want to know the output impedence, rather than the drive ability, there are several things you can do.Easiest is to inject a signal back into the amplifier while it's connected properly to a (flat-response dummy) load.
You know the impedence of the load, you can use a high impedence and a fairly high voltage to inject the signal back. Figure out the voltage divider equation at a given frequency, you know the load and the series (high) resistance from the source, so you can calculate the magnitude of the amp impedence from that.
Do this at a bunch of frequencies. Impedence is rarely constant.
If you have digital capture gear, you can do this for the whole audio band in one shot, but that's more tricky, and you have to know some signal processing.
Zout of many amps is very, very small, but they can not drive such loads, at all, btw.
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- err, no... - real_jj 08:57:16 05/25/06 (0)
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