Smeagol
DP Veteran
- Joined
- Jun 14, 2012
- Messages
- 4,147
- Reaction score
- 1,694
- Gender
- Undisclosed
- Political Leaning
- Undisclosed
SPL can't be measured by the output from the audio jack, as each speaker (headphone) will take the power given it and use it to create SPL that you perceive as music more efficiently or less efficiently depending on its design.
Also, higher frequencies are more damaging to hearing than lower frequencies, so overall SPL isn't an ideal indicator of hearing loss potential. Inside a car you are exposed to a lot of low frequency sound, but that frequency range isn't nearly as damaging to hearing as the high pitched whine of a ricer motorcycle engine.
Sorry, SPL = sound pressure level. db = decibel
But a specific device manufacturer would know what the safe audio level would be for the headphones it includes with the device, right? Then, I would imagine most other headphones have relatively close frequency range. Just an educated guess.