High frequency noise on the AC power can get into the analog portion of your signal, if you are unlucky. I have experienced this at least twice that I can remember: once with a little home recording setup that buzzed whenever the construction site next door powered up their circular saw; later in a large multi-studio post-production environment that had a bad HF spike on its incoming power, that caused a very faint hum bar that nobody noticed for a long time until it was caught by a major client (ouch). Both problems resolved through careful single-point grounding.
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It can be wrong assumption - depend how device (equipment) is grounded and how EMI/RFI suppression filter topology looks - very common issue called https://en.wikipedia.org/wiki/Ground_loop_%28electricity%29 - best is powering devices from same point (so use power bar connected to one wall receptacle ) also plugs must be oriented in same way in power bar (i know in US this is impossible almost but in Europe with Schuko connector type it is common that L and N can be swapped between devices).
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High frequency noise on the AC power can get into the analog portion of your signal, if you are unlucky. I have experienced this at least twice that I can remember: once with a little home recording setup that buzzed whenever the construction site next door powered up their circular saw; later in a large multi-studio post-production environment that had a bad HF spike on its incoming power, that caused a very faint hum bar that nobody noticed for a long time until it was caught by a major client (ouch). Both problems resolved through careful single-point grounding.
"Conditioned power" is really only needed in critical applications, like hospital equipment. Virtually all modern electronic devices have filtered power supplies and voltage regulators to trap-out line noise. Some folks do use UPS's (Uninterruptible Power Supplies) for their computer equipment. But, these are more to protect the equipment, in areas prone to brown-outs and/or power surges from lightning strikes. -
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I've had over 40 years doing sound and electrics, the only place I have found noise to be a problem is unbalanced audio running across a theatre stage.
Perhaps back in the 60's the fridge may have caused a click on my reel to reel
Lot of old snake oil.Last edited by super8rescue; 1st Apr 2021 at 15:07.
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Likewise, after half a century of doing battle, just a few problems that weren't solved with a mid-range filtered power bar. Proper grounding, elimination of ground loops, and sometimes a bit of additional shielding took care of the rest. Worst was trying to do a decent audio recording within a hundred feet of a high-power radio-teletype transmitter.
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