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Title: Too much back pressure.
Review: I bought the Yamaha SB79 Silent brass system because I live in an apartment building. I had not tried the product prior to buying it. Using the mute does make my cornet quiet enough to use in my apartment, however it creates a tremendous back pressure. This back pressure hurts my ears and gives me a headache. When using the earphones, the sound is unacceptble. It is advertised as creating Concert hall sound quality, but it only provides a tin like sound which is louder than the muted cornet.
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