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In Reply to: Re: Playing the devil's advocate here: posted by kenster on February 20, 2007 at 17:22:01:
HowdyI can't see how anyone couldn't see the danger. I'm serious.
Did you read my post? What don't you believe that I said in that post?
There are many devices which will obviously work. There are many which obviously won't. Then there are the ones which work for a while and then catch fire :) (Only slightly kidding.) Even if it could theoretically work for some equipment that equipment isn't tested in this configuration so we really shouldn't put too much confidence in that testing...
I'll never take a manufacturer of balanced power's word for it that it's safe. There are people out there that think MultiWave is a good idea too :)
Follow Ups:
............I certainly did read your post and reply'd in what I felt to be in a competent manner. Did U read the FAQ's about balanced power?"I'll never take a manufacturer of balanced power's word for it that it's safe."
Oh please, it's UL listed as being safe!!
"There are people out there that think MultiWave is a good idea too :)"
What do U have against PS Audio's Multiwave?
HowdyUL doesn't test with a ground at 60V for the life of the equipment so their test isn't necessarily relevant for the long term health of the equipment. It's only a slight exaggeration to say that UL doesn't care if your device self destructs under test, they only care if it hurts someone in doing so.
All of my arguments against MultiWave are the same as my arguments again indiscriminate use of balanced power. I'll try to write them in generic form for both MultiWave and balanced power:
They violates the assumptions of the designer of the equipment. That equipment isn't tested with inputs like that and some equipment which is competently designed will fail when put under that needless stress of unexpected input. The equipment isn't tested with those kinds of input and unforeseen problem could arise later if not when first plugged in... I wouldn't ever use such a feature without consulting the manufacturer (well actually for some of my equipment that I know uses a quality switching power supply I know that it doesn't care about MultiWave, then again why would I use anything but a pure sine for it anyway.)
"UL doesn't test with a ground at 60V for the life of the equipment so their test isn't necessarily relevant for the long term health of the equipment. It's only a slight exaggeration to say that UL doesn't care if your device self destructs under test, they only care if it hurts someone in doing so."The 60VAC is irrelevant. What is it that your missing? Balanced power STILL has the 120VAC swing and the device will still be protected in either situation.
I would refer U to the benefits of Multiwave but it sounds like U have already made up your mind. Either way, I still use the sinewave mode on my PS Audio PP-600 as it does sound better with tube equipment :-)
Cheers and thanx for the banter,
HowdyThe voltage of the safety ground certainly isn't irrelevant. As I mentioned before since standard practice is that it's very close to the same voltage as neutral except when some component has failed there are many ways that a designer could build something that cares when it isn't and in fact some better pro gear specifically shuts down when the safety ground is too far away from the neutral. UL doesn't care if something shuts down under test, but the user might :) Another example is the equipment that has a bleed resistor from the safety ground to the signal ground which may not be designed for the continuous current that 60V implies.
My point is that operating equipment outside of it's design parameters and it's testing domain is asking for trouble.
Good to see that you went to bed :) Have a good night. I'll listen to Rachmaninov another time or two...
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