Can you use 8 ohm speakers on a 6 ohm stereo? - Quora
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How to stop worrying about speaker impedance - CNET
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
Series Or Parallel Speakers – Which is Better + Pros And Cons