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av8en1
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Follow up on APC UPS …. I found the same UPS that had previously caused a buzz to be quiet at a different venue. This leads me to believe there was some interaction between noise on the 115 VAC power bus and the APC unit.

As for necessity, if the power goes off for 2 seconds, which happens in southern Illinois all to frequently: it takes my QSC K series powered speakers about 20 seconds to reboot. No way could I have my Q mixer back online in that amount of time. Also, if the mixer shuts down the USB recording is lost (at least that has been my experience.) So I’ll be using the cheap APC, provided it stays quiet.