Rockbox General > Rockbox General Discussion

How loud is too loud ?

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Erna:
Earphones normally range between 92dB - 110dB, with a few exceptions. Coming back to the sensitivity, average earphone sensitivity is around 100dB SPL @ 1mW.  Maxell tech report just replied me. The preferred range for sensitivity in their market is between 99dB SPL @ 1mW and 105dB SPL @ 1mW. Any higher sensitivity may cause harm to ones’ ear. So there input power is defined in mW, more generally than volts. The 32ohm earphone impedance produce 100mV at peak, but usualy lower than <100mW with 10 percent bias about 50mW. So I would suggest, or you even mentioned the same, meaning 'add/subtract' , that there would be 100dB SPL (but no 120) db per mW no volts. Correct 0dB is 100 SPL, -20dB 80db SPL and so on. So generally in 1-2 hours duration I couldn't really hurt my ear on 85-90db.

saratoga:

--- Quote from: Erna on January 18, 2014, 06:41:03 PM --- So I would suggest, or you even mentioned the same, meaning 'add/subtract' , that there would be 100dB SPL (but no 120) db per mW no volts. Correct 0dB is 100 SPL, -20dB 80db SPL and so on. So generally in 1-2 hours duration I couldn't really hurt my ear on 85-90db.

--- End quote ---

32 ohms gives about 10mW, so 0dB would be roughly 110dBSPL. 

Erna:
What I remember now, I have used Creative EP-480 crappy earbuds, those are stock earphones for sansa clip +. And their sensitivity actually is 112db, I don't remember maybe I was listening for 30min, no more. Maybe they had some influence 110db + additional 12db is 122 dBPSL (32ohm) on 0 db. But thats a lot, and 8-10 db more than usual market earphones. -20db on rockbox would be appr 100dBSPL, thats damn a lot. Is this possible ? Probably many people had them in beginning who bought sansa clip +.

saratoga:
I don't think those headphones ever came with the clip. 

Erna:
Yes, I have noticed suddenly. Creative..yea. Thats misinformation. But sansa either nor manufacturing them nor selling them. They buy the cheapest possible analog from someone beneficial, its just interesting to find information, but probably for low end 10$ parameters are the same.

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