Does bi amping change impedance?

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If you bi-amplify an 8Ω loudspeaker does that mean its impedance drops in half to 4Ω? If you want to learn more, grab a copy of Paul's new book, The Audiophile's Guide. https://www.amazon.com/Audiophiles-Guide-Stereo-Paul-McGowan/dp/B08STSRW49/