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Hi Cranky,I am not sure Suri was very particular about a CVT as such, my impression was that it was more general: whether a device that is designed to produce a constant voltage supply obviously with a given error (on the voltage stabilisation) like a CVT or a servo based stab is good for audio equipments.
COULD THIS BE AN OPTION-
= BUY A HONDA PETROL ENGINE (SILENT) GENERATOR, locate it at a distance in a ventilated enclosure (for better sound attenuation) and use this as a dedicated power source for the audio reproduction equipment.
It seems to me that alternators should be able to supply clean sine wave power with adequate amps; further there would be isolation from (dirty) mains power lines, and there would not be surges in the supplied voltage.
if this is, indeed, a viable option, then, what VA should the generator be? any recommended ancillary equipment to be used between the generator and the audio reproduction equipment?
In terms of preferences for pure power I would rate the following as good in the order shown below:
1. Regenerators. This isolates the equipment from the power source and delivers a completely clean output.
2. UPS that deliver enough KVA and pure sine wave output. They are kind of half way to a regenerator. BUT, for an UPS to be effective, they should have low tolerances and switch to batter power extremely fast. For the kind of ratings we look for such UPS end up costing 40 to 50K or even more.
3. Servo controlled stabiliser that deliver a voltage plus/minus acceptable limits. Companies such as Krykard, Aplabs, Audire, and Vertex make extremely good servo stabilisers that will protect your equipment and also clean power for it to work well. Since you also have EMI/RFI filters as well as Spike protection built in, your equipment are very safe.
The only issue with servo as against a UPS is that you cannot use your equipment when there is a power failure.
Also read post no. 29 in http://www.hifivision.com/audio-video-accessories/1144-suggest-voltage-stabilizer-3.html
A 1KVA should cost less than 20K. The battery power neednt be substantial - 5 to 10 mins to allow you to switch off gracefully..
One can add an isolation transformer if needed for a few Rs K more.
The pure sine waves as stated are obviously expensive and also the best. I've been using the quasi sine waves ones for all my PCs and they offer great protection and SQ too is great.
I've been using APC for years and absolutely no problems. They offer lots of options but in this thread's context quasi sine wave and pure sine wave. The pure sine wave ones are also online UPS where they charge and discharge the battery continuously and all supply comes from the battery whereas the quasi ones will supply power from the mains, and the battery kicks in when the power goes off. The pure sine waves as stated are obviously expensive and also the best. I've been using the quasi sine waves ones for all my PCs and they offer great protection and SQ too is great.
Agreed, but this only strengthens the point I made. Most of us are looking at 2 to 3 KVA, and that will work out to 50K or more.
Other than an projector, none of the audio or video equipment need to be switched off 'gracefully'. There will be no harm to the equipment if the power is cut off suddenly.
Arent you confusing line-interactive vs online with quasi-sine wave vs pure sine? I think both can be pure sine wave UPSes.
To my knowledge a line-interactive UPS is a step better than offline UPS. The power is filtered to be similar to pure sine wave, but not exactly and only results in better power conditioning. I am not too sure if line-interactive can be pure sine wave. If it is then I stand corrected (and something more learned today). Please let me know/correct me.
Ultra Isolation Transformer.what is UIT and how much does it cost?
thanks Kamal. So what I understand is that to keep mains noise out I need UIT. In a place where there is a stable power supply I need just that, and maybe a surge protection strip. What about EMI/ RFI filtering?
# Not really an issue, unless your house is very near a HT line/substation
If the power supply is fluctuating, I buy a servo for constant voltage. And servo must be between mains and UIT. Is that correct?
Is UIT needed for amps also, or does it suffice to have it only for sources?
# If the fluctuation is bad,then amps will also benefit;UIT's are not expensive ,compared to UPS's/Servo Stabs.