Very good and wise advice Tyll! I agree the optimal and safe "concert level-like" listening volume is 85dB at your listening position with speakers, and also the same perceived volume is what I prefer on my headphones. Louder than that and at louder passages I feel uncomfortable and have to turn the volume down. Lower than that might work, but at some passages it might lack some impact. So usually I listen to music at around 85dB, both on speakers and headphones. That corresponds to 19/50 on my Marantz receiver, and 10-11 o'clock on my Dynahi.
That's of course recording dependant. Listening to Ana Caram's "The Other Side of Jobim" (A Chesky recording) to achieve that same perceived volume of 85 dB through my speakers I have to set the Marantz to (corrected, just checked) 28-29 over 50. That recording has excellent dynamics, so the average volume is relatively low compared to most compressed recordings. The beginning of Koyaniskatsi is the one that does require a setting of 30-31 over 50 on my receiver.
I have also perceived the low frequencies caused by your own hearing, and can consciously reproduce it. Didn't know it was caused by your inner ear, I thought it was probably caused by muscles from my jaw or from my head, the muscles that some people use to move their earlobes maybe. I can't move my earlobes, but I thought I was making those muscles tremble causing that low freq that I could hear, maybe from bone conduction. It is certainly hearable, a mild low to mid bass tone, similar to the low flutter you would hear with a very soft wind hitting your earlobes in a consistent manner.
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