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Best headphone impedance for the R1a?

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Ideal power match is 50 Ohms but they will safely drive any load from 8 Ohms up. I recommend the 100 Ohm phones as the 600 Ohm phones may be a little shy on maximum level in noisy environments. Also, you can easily decrease the sensitivity of the 100 Ohm phones with a 100 to 200 Ohm series resistor (s) in the connector. You can't easily increase the sensitivity of the 600 Ohm phones except with a bulky (impractical) transformer

Best Regards,

Larry Fisher

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