Apple headphones maximum db output?

Question

I've recently got hooked to listening to white noise at work because it helps me focus amidst all the noise. I use the brown noise generator from SimplyNoise for this. I was trying to measure if it was safe to actually listen to noise for around 6-7 hours a day.

For evaluating this, pretty much the only references I've found was that listening to noise at 64dB for 6-7 hours a day is considered "safe" which lead me down this road.

Answer 1

Extracted form Apple's Store In-Ear Headphone's overview:

Technical Specifications

• Frequency response: 5Hz to 21kHz
• Impedance (at 100Hz): 23 ohms
• Sensitivity (at 100Hz): 109 dB SPL/mW
• Drivers: Custom two-way balanced armature (woofer and tweeter in each earpiece)

If you are using the regular Earphones, although I couldn't find any official technical specs, it's dB output would be lower than the In-Ear's, something like 103 dB.

And for the safe decibels, just remember that:

• A typical conversation occurs at 60 dB – not loud enough to cause damage.
• A bulldozer that is idling (note that this is idling, not actively bulldozing) is loud enough at 85 dB that it can cause permanent damage after only 1 work day (8 hours).
• When listening to a personal music system with stock earphones at a maximum volume, the sound generated can reach a level of over 100 dBA, loud enough to begin causing permanent damage after just 15 minutes per day!
• A clap of thunder from a nearby storm (120 dB) or a gunshot (140-190 dB, depending on weapon), can both cause immediate damage.