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resistors - Connect 8 ohm speaker output to microphone input on another system - Electrical Engineering Stack Exchange
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Penton JD20-IP-M-IO 4” High-Performance Ceiling Speaker with Ip Module Control Output, Push Button Input, Built-In Microphone
Is it true that you can use an xlr microphone in a speaker if you plug it into the line out port? | TalkBass.com
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