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Sound system hums when powered off!!!!
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<blockquote data-quote="Mike Caldwell" data-source="post: 201841" data-attributes="member: 170"><p>I had time today to go back to the venue and dig a little deeper.</p><p>Started unhooking speaker lines from the amps, only had to do about half</p><p>of them till I found the trouble maker. As was the general consensus along with my</p><p>gut feeling the positive lead on one speaker zone was shorted to the building</p><p>frame. I measured 0.5 ohms between the positive lead and the electrical/building</p><p>ground. Connecting the speaker's negative lead to the amp or any ground reference</p><p>in the rack would complete the circuit causing the speaker to hum from the voltage</p><p>difference between the ground points.</p><p></p><p>The building maintenance supervisor found the compromised insulation after I told him</p><p>what zone to start closely looking at the speaker cabling.</p><p></p><p>Mike C.</p></blockquote><p></p>
[QUOTE="Mike Caldwell, post: 201841, member: 170"] I had time today to go back to the venue and dig a little deeper. Started unhooking speaker lines from the amps, only had to do about half of them till I found the trouble maker. As was the general consensus along with my gut feeling the positive lead on one speaker zone was shorted to the building frame. I measured 0.5 ohms between the positive lead and the electrical/building ground. Connecting the speaker's negative lead to the amp or any ground reference in the rack would complete the circuit causing the speaker to hum from the voltage difference between the ground points. The building maintenance supervisor found the compromised insulation after I told him what zone to start closely looking at the speaker cabling. Mike C. [/QUOTE]
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