Peter P. Posted November 30, 2022 Share Posted November 30, 2022 Today was an audio repair day for me. At work, I was servicing an intercom system for a police department. With the system, they are able to listen to the people in the cellblock, and talk back to them if necessary. The system uses a ceiling mounted speaker as both speaker AND mic. In this case, the mic/speaker was an 8" driver. After many hours of troubleshooting the electronics of a system I know little about, my colleague and I discovered the reason the dispatchers could not transmit to the cellblock was because the speaker failed as a mic, yet it worked fine for receiving audio! We replaced the 8" driver with what we had on hand, a 4" driver, and it worked wonders. So I go home tonight and decide to put on a new CD for a first listen, and I'm getting hum through the speakers. Huh? I had just reinstalled my stereo after having new carpet installed so of course everything was unplugged, moved, then plugged in again. After much troubleshooting and substitution, I found the culprit- the shield on one of the RCA cables had a broken shield connection, barely visible even with a magnifying glass! I'm gonna try to solder it together. If you look REAL closely, you can see the shield wire and the gap to the connector. 3 Quote Link to comment Share on other sites More sharing options...
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