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ihatejazz wrote:In fact I honestly felt that the sound improved tremendously. Background much quieter and full of detail and life in the music.
ihatejazz wrote:Contrary to rumors from audio gurus a U.P.S. did not, in any way, dteriorate the sound of my system. In fact I honestly felt that the sound improved tremendously. Background much quieter and full of detail and life in the music.
This is my first salvo using the unpopular device which most of our audio hotshots frown upon. What have I got to lose? To my satisfaction I am buying this 600watt capacity unit for sole use of my Clearaudio Balanced Reference phonostage which I don't intend to turn off and want it on even during brownouts. I will be buying two units of 1.25kva for my power amps.
Hyperion wrote:To make the discussion more interesting, let me put some technical perspective into it ...
First we must remember that there are two types of UPS: stand by UPS and continuous UPS.
Stand by or back up UPS only supply power through its batteries by way of DC-AC power invertion when the AC supply is not available from the power grid but normally just power devices plugged into it from the AC line. Obviously this does not have any potential benefit except during power outtage or if it is used to power audio components while unplugged to the AC outlet. (hint: if it is cheap, small and lightweight ... it is probably a stand by UPS )
Continuous or online UPS always supply inverted power through the batteries which are also continuously being recharged. In short, the components plugged into it is theoretically isolated from the potentially noisy AC grid supply. (hint: if the UPS happens to be more expensive than you expected, big bulky and even heavier than your power amp ... it is probably an online UPS )
There are however also 2 different types of Continuous UPS each with different types of output AC waveform:
1. modified sine wave (usually innacurrately called square wave)
2. pure sine wave
Usually, sensitive electronic devices like laser printers, digital clocks and of course audio components MUST use pure sine wave UPS to ensure that they perform as designed and intended. (hint: if the online UPS seem to be cheap for an online UPS it's probably a modified square wave generator)
High capacity inverters capable of supplying low distortion amplitude-stable pure sine wave are very expensive (hint: $1k up) and so are UPS that can do the same thing since they are essentially inverters with batteries and recharging/monitoring circuits. Also, all "pure" sine wave UPS have harmonic distortions and amplitude instability of varying intensity in their AC output because the sine wave is generated by oscillator circuits like wein bridges or digital wave-shaping / sine wave approximation techniques instead of magnetodynamic AC generation.
So the bottom line is: RFI/EMI infested AC grid line vs UPS sine wave harmonic distortion / amplitude + frequency instability. Pick yo poison.
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