Re: acoustic hum from UPS units

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Article #1581

#1581

From: Soundhaspriority
Date: Sat, 07 Mar 2009 03:04

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"hank alrich" <walkinay@nv.net> wrote:
> Soundhaspriority <nowhere@nowhere.com> wrote:
> 
>> These are Cyberpower 1500AVR (automatic voltage regulator). They make no
>> switching noise, but they  contain autotransformers with automatic taps for
>> over/under voltage adjustment. That's what's causing the hum.
> 
> Teach 'em the words.

I've also noticed incessant humming from the Fedex units that drive past my
house day and night.


"I don't really have a replacement career, it's a very gnawing thing."

Robert Morein
Dresher, PA
(310) 237-6511 
(215) 646-4894

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Date: Fri, 06 Mar 2009 22:04:27 -0500
Subject: Re: acoustic hum from UPS units
From: Soundhaspriority <nowhere@nowhere.com>
Newsgroups: rec.audio.pro,rec.arts.movies.production.sound,aus.hi-fi
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