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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Clicks/pops in 70V commercial audio system
Hello,
My father owns a few resturaunts and these use 70V commercial sound systems for the background music. In one of his stores, the speakers are making a crackling or popping sound all of a sudden. He asked me to change 3 speakers (they were in quiet areas where it was most noticeable so he thought that was all it was) and the problem is still there, even in the new speakers. I started suspecting the 70V amplifier. He had a spare one, though it was used and about as old, so I installed that one to see if there was a difference. The crackling was still present. Anyone have any ideas what to check for? So far, I have tried: replacing a few speakers tried a different, but not new, 70V amplifier tried different wattage settings at the speakers tried to adjust the volumes on both amp and source balanced bass and treble None of this seems to work. I do have an oscilloscope and know how to use it, but have not had a chance to bring that with me and look at the signals. Any suggestions? Scott |
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