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  1. AudioRookie

    What is 'nominal impedance'?

    Hello, I was hoping you all would be able to help me out in relation to a question I have about 'nominal impedance'. Currently, I have a set of Sennheiser HD515 which has a 'nominal impedance' of 50 Ohm. I am looking to upgrade to a set of Sennheiser HD650 which has a 'nominal impedance' of...
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