Wow, so you're just going with full volume all the time! :D Interesting. Scary, but interesting. The base noise level my phone's frequensee shows me right now is around -85db. My normal ultrasonic volumes are between -70 and -60dB (1/3 to 1/2 volume), depending on which phone & headset I use. That's with the phone's mic up against the speaker and I'll move it around to make sure its the highest reading I can get. I CAN get to -40dB if I max out the volume.
It seems I'll start hearing the US track more prominently between -60 to -57db (60 - 67% volume) and then it'll start becoming too much beyond about -50dB (85% volume). I remember testing that if I go above -65dB I'll start having some residual ringing in my ears after listening. I checked frequensee on my other phone and it shows about 5dB less than these numbers.
The stream will start to feel too loud at around 60% volume. My two phones show the audio pretty differently with the same headphones and source, but the limit is something close to -50dB too. There's much more variance here between dB measurement and headphones.
Overall I think the mic's purpose in a phone is to receive speech which I think is somewhere around 500-1500 Hz (just guessing).. so they might have a poor high-freq response, i.e. they'd probably show less than what the level actually is. So not sure what's the maximum level that's still fairly safe for long-term use, so I'd not develop some life-long tinnitus problems.
Do you consciously hear the ultrasonic track all the time when you're playing it? Clearly? Do your ears ring after listening? Anyone else, what volumes are you using with headphones?
It seems I'll start hearing the US track more prominently between -60 to -57db (60 - 67% volume) and then it'll start becoming too much beyond about -50dB (85% volume). I remember testing that if I go above -65dB I'll start having some residual ringing in my ears after listening. I checked frequensee on my other phone and it shows about 5dB less than these numbers.
The stream will start to feel too loud at around 60% volume. My two phones show the audio pretty differently with the same headphones and source, but the limit is something close to -50dB too. There's much more variance here between dB measurement and headphones.
Overall I think the mic's purpose in a phone is to receive speech which I think is somewhere around 500-1500 Hz (just guessing).. so they might have a poor high-freq response, i.e. they'd probably show less than what the level actually is. So not sure what's the maximum level that's still fairly safe for long-term use, so I'd not develop some life-long tinnitus problems.
Do you consciously hear the ultrasonic track all the time when you're playing it? Clearly? Do your ears ring after listening? Anyone else, what volumes are you using with headphones?
Thoughts, opinions and beliefs subject to change without prior notice.
