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In Reply to: Jon Risch and others: power handling abilities of a Risch filter with four inductors. posted by mark maloof on December 14, 2004 at 23:44:13:
Well, a dedicated line would be nice, but I live in a NYC apartment (over 100 apartments in the building!), so I imagine that it would not be possible, or would be expensive. If it would be possible, and I could do it for $500 or less, I would. Anybody who lives in a city apartment who tells me it can be done may inspire me to seek this out. At least the duplex outlet is on its own breaker on the ciruit box (all it shares is a hallway light.) So here is what I'm thinking of doing:1) Risch filter (and later maybe a balanced power filter before it) for tube pre and SACD player (which will also be on a diy isolation transformer), and electrostatic panels (turntable runs on a battery.)
2) a DIY quad box (two duplexes) for the Innersound amp and Monarchy monoblocks/Music Reference RM9 tube amp (when I switch off from the Monarchys for a different sound.) NOTHING but straight AC to the duplex outlet feeding the Innersound amp, but an AC-rated cap on the duplex for the Monarchy Monblocks/Music Reference amp. That way, the electostatic panel amps get a bit of filtering (besides the Quiet Line filters around the apartment.) The Innersound amp, per Al's experience, will get no filtering. The source components will get fill filtering (and balanced power at some point), plus iso transformer for digital. Sounds ok, huh?
So my question: what value of cap (s). I know Chris Venhaus recomends two .47 Auricaps in parallel, but even he states they are not AC rated, and so there could be risk. Any AC rated power caps you can recomend that, um, "sound" good, and what value and voltage should I go with? Should I "double up" caps? I place the cap(s) leads across the hot and neutral on the ac duplex outlet, right? Also (silly question?), in regards to the duplex for the Monarchy/Music Reference amps, should I break the tab and seperate wire each outlet of the duplex to the incoming power cable? I "starwired" the duplexes in the quad box I made for my source components, anything to be gained in starwiring each of the two seperate outlets in the amp duplex socket, or is that a waste of time (and an extra cap(s) for the duplex.)
Follow Ups:
The Auricap tweak worked well on my modded Toshiba Sd4960 universal player. But then again, it is really a cheap piece of junk that (for the money) sounds damn good after mods. Of course I have it plugged into Jon's digital isolation transformer which is fed by Jon's power conditioner. The cheapo switched power supply in this Toshiba unit needs all the help it can get.It seems to work fine on source components, but I don't know if I would use the Auricaps on an amp. I have an Audio Prism power line filter on the same outlet as my amp. You could, of course, manufacturer one of these yourself with a couple of x-rated caps (but it's cheap enough as is).
Good luck,
Bob
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Diversity is good. Diversity with a good beat is better!
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Filters typically have inductors in series with the load and capacitors across the load.My experience with the InnerSound amp is that I can hear the bass consequences of using a dedicated AC circuit run in armored cable versus one run in heavier gauge plastic. The armored cable circuit was installed at a different time and has more cable between the outlet and the breaker box. It has more series resistance.
I expect this difference is less than the difference between having series inductors and not having them in a filter arrangement.
However, adding a parallel capacitor (hot to neutral) at the outlet helps with the InnerSound, even on a dedicated circuit. This does not restrict the current flow into the amp.
I don't want to recommend that you use a non X-rated cap for this application, but I only have experience with using 500-volt silver-mica capacitors or 600-volt Mylar capacitors. The silver-mica are superior.
Al tipped me off to this cap trick and I'm using the same silver mica caps he is simply seated in ordinary houseplugs. These I place in: my wall socket, my unused socket in my amps' power strip, etc., per Al's suggestions and my own experimentation.Result: first cap in unused 4th socket in my DIY power strip to amps was a very clear improvement in detail and imaging and soundstage. Quite a nice trick! Other placements haven't quite yielded as stunning a result, but I've got lots of places in my household electrical system yet to try. Al told me he thinks the effect is cumulative.
Cannot tell you the brand, though...
Just wondering what brand of of silver-mica cap you like, how much, and where you got it?
What value?
Just wondering: rather than putting a cap or two on the four box outlet that I will build for the amps, couldn't I just put that large AC cap across the duplex outlet feeding the whole system (amps and source.) I will be using a Risch filter for the source components, but figure that having an ac cap at the outlet serving the whole system couldn't hurt...or could it create problems coming before the source component's Risch filter (and perhaps balanced filter some day.)
10,000 pF at 500 volts, part number 95-314, $0.75 each. Click on capacitors, then silver-mica, then scroll to the bottom of the page.I found some of these for $0.45 each at a local surplus store, but they are now sold out of them. Mouser wants about $9.50 each.
Use trial-and-error to find the best combination of locations for these caps. It may work out that all the places you mention show a benefit. Also try them on other circuits in other rooms. I found a lot of benefit placing them on the same outlets feeding the UPS devices for our computers.
If you don't hear a benefit in a particular location, take the cap out. There may well be some sort of interaction that harms the sound with future changes.
They (and others) claim the Ultimate Outlet does not kill amp dynamics. I know for sure that a balanced power supply (Blue Circle) did not work well with my amps (made them sound too dark.) The PS Audio UO uses a balun, I think. Anybody know what the deal is with baluns, and if indeed such a device wont create negative influence on amps? I'm leaning most towards just a cap or two for the amps, and nothing for the Innersound crossover/bass amp.
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