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I'd disagree. Calibrating at 65 is fine. All you are doing is calibrating your system to 20dB below reference. I typically watch at 10-15 below reference.
There's little difference between calibrating at 85dB and then using one tone to quickly find out what 20dB below reference is and calibrating at 65dB and then turning one tone up to quickly find out what reference is. Either way you've level matched your speakers and that's all that is really important.
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