Hi, I had my luthier install a lyric in my Martin D28. The first couple of days with it in it sounded fantastic. I gigged with it a couple of days ago and was so pleased with how it sounded. Yesterday when I plugged in it sounded very "boxy" with quite pronounced mids. I tweaked the presence but no change. I plug into a zoom A3 into digitech jamman looper into line6 stagesource pa. Has any one else had the same issue? Could it be a faulty unit? I changed no settings so I am completely in the dark as to how the sound can change so dramatically so suddenly. Thanks From Darren in New Zealand

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