danadam
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The spec for DT 770 PRO says nominal SPL 96 dB. From measurements of different DT 770 models on reference-audio-analyzer.pro, it seems to me they aim at 96 dB SPL/mW on all models and then by choosing models with different impedances (32, 80, 250) you get different dB SPL/Vrms.The DT770 specs say 105dB, but it doesn't give a power or voltage. I assume that's sensitivity at 1mW...
Btw, this old converter (webarchive) calls dB SPL/mW efficiency and dB SPL/Vrms sensitivity. I don't know how common it is, but I like the distinction.