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HD598 Is their spl rating per Vrms or per mW?

Discussion in 'Headphones (full-size)' started by jensigner, Jul 14, 2013.
  1. Jensigner
    According to my HD598 box, the spl is stated as being 112 dB @ 1kHz and 1Vrms.
    However in several places including a review, I see the spl rated as 112 dB /mW for the HD598.
    Obviously they can't both be correct with the nominal 1kHz impedance being ~ 50ohm.
    If 112 dB/1Vrms is correct that means 99 dB/mW (for 50ohm nominal).
    I contacted Sennheiser but they didn't answer the question.
  2. Music Alchemist
    This is an old thread, but I wanted to share this:
    It is indeed "112 dB (1kHz / 1Vrms)".

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