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This may be a dumb question, but...

m0lsx

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They cannot hear, but they will feel the vibrations caused by the sound (sine) waves & thus I would guess, the lower the frequency, the more it is likely to disturb them. But I would imagine the louder it is, then the more they are likely to feel the vibration.

Take a read of the following it is by professional musician Dame Evelyn Glennie who is also profoundly deaf. She describes how she feels the music & can increase this sensation by, for example, performing barefoot. Your T's hair & feet will pick up sound vibrations similarly.

https://www.evelyn.co.uk/wp-content/uploads/2019/05/Evelyn-Glennie-Deaf-and-Music-Questions.pdf
 

m0lsx

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Just to add the size & shape of the enclosure will, among other factors affect the way that your T's sense the vibration from the music. As will where in the room, in relation to your speakers their enclosures are & on what they are sitting. For example, I would imagine a self standing shelf is far more likely to vibrate it's self, than a solid, built into the wall, mantelpiece.

Another area to look at when it comes to how sounds are felt is something called Infrasound. This is very low frequency sound. So lower frequency than we can hear & we only hear sounds down in the Hertz frequency range. So ultra low frequencies to start with.

Many believe Ultrasound explains why some places are experienced as haunted, or wrong in some way. As it is certainly possible to prove many of these places have higher ultrasound levels than normal & also it is provable that you can induce such feelings by using suitable frequencies. One artist, Anish Kapoor used infrasound as an art installation called "Anxious."
 

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