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Brain injuries from loud bass?

Ever played through one?

It's as loud as an SVT, easy.
Oh, I know all about Sunn...say hello to my Teenage Wasteland rig...
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...and my coffeehouse set-up...
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I’m still spry.
 
I can only attest to my personal experience. Granted the guitarist was dealing a full Marshall stack, everything was downtuned, and it was a small-medium indoor venue. But it felt like the loudest show I’ve ever attended. And I’ve seen Sleep twice.

It was “what did I just do” stupid loud.
My right ear was substantially impacted at a tender age by Iron Butterfly in their heyday; fast forward 30 years, and I’d have to say that My Bloody Valentine in a 2K theater was the most intense, but I was fine after about three days.
 
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That's a very intriguing question...

I've heard and read that long-distance big-rig truck drivers, and people who spend a lot of time on tractors or other heavy equipment, can incur kidney damage from absorbing the vibrations associated with those rigs.

Maybe long-term exposure to powerful bass frequencies can damage the brain; I don't know. I'd be interested to see the results of a comprehensive study.

I work in industry. Hearing protection almost everyday.

I’ve been told loud noise raises blood pressure.

I would agree it’s not just bad for hearing.
 
Military research on concussion-related brain damage, as well as the more popularly known football/hockey/soccer head injury stuff is based on high speed transverse shock waves caused by sudden movement or shock waves. The brain has the consistency of pudding. It is susceptible to damage caused by the high shear forces during impacts or pressure/shock waves. These are mostly extremely low frequency, but high energy waves.

Sound, on the other hand, especially bass is in the 10's of Hz and higher. And the pressure from music is many order of magnitudes lower than explosions or impacts. So you are not likely to see any of the same type of brain damage from music.

Nerve damage and hearing damage are completely different beasts. There is research on long-term exposure to high intensity focused low frequency sound. There is even some evidence that this has been weaponized. Look up things like Cuban Embassy workers. Less is publicly known about this subject.