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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: what a well reasoned response, kudos! posted by docw on August 30, 2006 at 14:13:17:
I use an Equi-tech 2RQ. It is a big, heavy and fairly expensive transformer in a box with a bunch of outlets on the back, a couple of switches, a digital voltmeter and some filtration on a couple of the outlets (for digital equipment). It's rated at 20 amps, which is more than most household circuits are rated to deliver. I run my entire system from it.Similar products, at a slightly lower price, are made by "Balanced Power Technologies." The Equi-tech's are UL listed, which I think is important. Also they have ground-fault interrupters on their outlets, which is an essential safety feature. "Balanced power" energizes both the "hot" and "neutral" conductors with 60 VAC, each, 180 degrees out of phase (thus giving 120VAC potential difference between the conductors). Because all equipment is designed for "normal power" (i.e. a hot conductor with 120VAC and a "neutral" conductor at 0 VAC), power switches and line fuses are only on the "hot" side. Thus, if there is a fault inside the equipment and you are supplying it with balanced power, neither the equipment's power switch, nor its fuse will protect you from the fault if it's on the neutral side, because balanced power energizes that side. The ground fault interrupter detects the current flow from either the hot or the neutral side to the safety ground (which is what happens when there's a fault) and trips the circuit open.
So, look for that. I believe Blue Circle makes a balanced power supply that they call a "power ring" and Transcendent Sound makes a 8-amp supply that goes for $370 as a kit and $470 assembled. The Transcendant product does not have a GFCI and has only one outlet; I think you're supposed to use it with a power strip connected to the output. Here's a link: http://www.transcendentsound.com/power_supply.htm. This looks like it would be best for source components and preamps, not poweramps or subwoofers.
If you read the reviews of various balanced power transformer products (check Soundstage and Stereophile websites), you will find that the reviewers report similar effects: cleaned up CD playback and tighter, deeper bass from subwoofers. This was my experience.
The PS Audio power regenerators produce balanced power but they also produce tons of heat, consume a lot of juice and create the possibility of current limiting, which can constrict the sound of power amplifiers. (There is no PS Audio unit that is rated to deliver 20 amps, I believe.)
The president of Equi-tech says that almost all of the sonic benefits claimed by PS Audio arise out of the fact that the power the PS Audio units deliver is balanced, rather than the fact that it is regenerated.
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Follow Ups
- Re: balanced power - Bruce from DC 15:44:27 08/30/06 (0)
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