Sure. I added some reading material links to my comment. The Rane document has an OSHA safe sound levels table at the end, a good reference. Keep in mind that t

Sure. I added some reading material links to my comment. The Rane document has an OSHA safe sound levels table at the end, a good reference. Keep in mind that the dB scale is logarithmic if you want to crunch numbers on device power, headphone sensitivity and impedance, and resulting SPLs.