Quote:
Originally Posted by crystalworks
Wow, never run across one of those. I can still definitely hear above 17kHz as learned during my stereo tuning. Wonder how annoying that thing actually is? You said it's uncomfortable... I bet. 
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The good news is that they are generally just set up at the entrances to discourage loitering. But it generally knocks my tinnitus up a notch for a few hours.