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audio - How do I set up speakers in series and/or parallel for a minimum 4 ohm load on the amplifier? - Electrical Engineering Stack Exchange
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How to connect four 8-ohm speakers in an 8-ohm amplifier? I have two channel amplifiers. Each channel I need to connect 4 speakers. Is that possible - Quora
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Speaker Impedance, Power Handling, and Wiring | Jensen Loudspeakers