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Constant humming and weak connection.
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I bought a pair of these for some sound reenforcement work and they constantly lost connection with their receivers, even though the transmitters were only about 40ft away
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It doesn't sound like radio interference - more like a loose wire or connection somewhere.
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Checked the connection into the sound system, no problems there
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I tried every channel and was constantly getting a crunching noise -- the sound you get when there's a loose connection.
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They did not appear to be due to a loose connection, because the pops occurred even after I set everything down
