I think this can go either way. I also went to a chiropractor who used the metal appliances. I do not remember what that technique is called, as it was about a year ago.
She put the appliance inside my ears and the “thump” of the treatment actually made my ear ringing worse. I left the office feeling much worse than when I arrived.

I truly feel like a guinea pig with all the treatments I have tried.
I’m glad this treatment worked for you.