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RE: update on web search

I'm suggesting you parallel a 25-50 ohm resistor across the output of each of your amps. When the speaker is connected to the amp it sees ~ 6-7 ohms assuming 8 ohm speakers. When you disconnect the speaker the amp will see 25-50 ohms depending on the resistor value you choose to use. Most amps should tolerate both 6-7 ohms and 25-50 ohms across 8 ohm taps with signal applied w/o issue.

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