Hi! I'm currently trying to find out how loud is it safe to listen to music, knowing headphone impedance, sensitivity, and knowing the output specs of my computer (I listen mostly from my iMac). I really don't know much about these subjects of resistance and sensitivity, and was hoping for someone to enlighten me.
I currently use my Shure srh840 with my iMac (no amps or dacs as of yet). They are low impedance (44ohm) and have a sensitivity of 102dB/mw.
My iMac has an output impedance of 65ohm and a "maximum level: 1.4 V nominal (root mean square), 4.0 V peak-to-peak", which I don't understand.
Can I with this calculate how much dB are produced at maximum volume? How many dB is the safe listening level? I think this is really important, cause I want to preserve my hearing and enjoy better headphones in the future. Sometimes I get headaches after listening for too long; and I don't know if it's because I'm listening too loud, or I'm still getting used to the clamping force.