It works well, but no matter how I place it, I get a lot of feedback. Tried the various techniques provided, because I knew fit was important for feedback questions, but no one could get rid of it completely. The sound quality is good, and the workmanship seems to be good, but this is the first model I try to be unable to correct. I have several different amplifiers, and hearing aids and trial and error can be solved correctly, and I believe I will use this amplifier as well
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