determining true output

[catonec 10+ year member]

I want to know how to determine the true output of my amps. Can I use a multimeter to measure voltage and current on my speaker leads then multiply them to find watts? and if so would I need a constant test tone to find rms? I do not have access to an oscope right now but if needed I could get one. thanks

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[helotaxi 5,000+ posts]

Don't cross post. Put it in the right forum and post it once. See my answer in the other forum.