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Calibrating to 75db - listening level confusion

Calibrating to 75db - listening level confusion

I've recently calibrated my home theater and am really satisfied with the sound in room. What I'm confused about is if I run RTA in REW, shouldn't normal dialogue be somewhere around 75db at reference (0 on my receiver)? What I'm getting now is dialogue at 75db is around -13 on the reciever...

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