Thank you ab initio, xnor, anetode & skamp. @xnor Thanks a million sir for all of your help. I now know that I'm listening to headphones in safe volumes and its a great relief for me who is just at the beginning of hearing of the sounds of the world and needs his ears at least for 50 years...

I don't know how I should thank you xnor.   If I understand your words correctly, so:   M50 sensitivity = 115 dB/V 10% = 115-52 = 63 dB SPL 20% = 115-47 = 68 dB SPL 30% = 115-41 = 74 dB SPL 40% = 115-36 = 79 dB SPL 50% = 115-29 = 86 dB SPL 60% = 115-23 = 92 dB SPL 70% = 115-16 =...

Thanks xnor & jcx. @xnor what a great & helpful reply. I thought 50% of sound volume is much more than 85 dB and so I never passed 30-35% of sound volume. 1.I don't want to take your time, but may I ask you to learn me how to calculate sound loudness (dB) as you did? I mean if for...

Thanks PurpleAngel, xnor & ev13wt.   The reason of my questions is that a week ago I went to audiometry & the guy said me don't listen to music using headphones at all but I can't. So I decided to listen only in safe volumes (Like 75-85 dB), but I didn't know how I should measure sound...

I've got two horribly embarrassing questions that I want to ask. I listen to music using headphone (Philips SHP2000) & my sound card (Creative Audigy Value) that have such a specifications: Philips SHP2000 Acoustic system: open Frequency response: 15 - 22 000 Hz Impedance: 32 ohm...