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Old 20th February 2008, 10:35 AM   #1
d3imlay is offline d3imlay  United States
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Default amplifier reactive load testing

I need a model of a full range speaker to do some reactive load testing on an amplifier.
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Old 20th February 2008, 10:47 AM   #2
AndrewT is offline AndrewT  Scotland
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Pass and ESP have published some info on this.
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Old 20th February 2008, 02:55 PM   #3
gootee is offline gootee  United States
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Don't forget to also model the speaker cables.

I found what seemed like some good modeling information at:

http://www.westhost.com/cable-Z.htm

There is a (dual) speaker model, there, too, IIRC.

There are also some 'standard' amplifier tests that use a capacitor in parallel with a resistor, for the load, driven by squarewaves. Typically, the capacitance is up to 2.2 uF in parallel with 8 Ohms, IIRC. But don't forget to also try smaller capacitances. I have seen cases where 2.2 uF looked fine but 0.1uF made it oscillate.

Also, remember that with squarewaves for the input, everything will depend on their rise and fall time. There is a recent thread about that, here:

square wave testing and slew rate
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Old 21st February 2008, 02:41 PM   #4
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Arny K. did one some years ago. Try:
newsgroups
rec.audio.tech
rec.audio.high-end

www.pcavtech.com
www.pcabx.com/
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