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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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[quote user="drdna"] It is not exactly correct. There is 60 Hz hum eliminated by lifting the ground to the amplifiers. The neutral is connected to the ground prong and chassis in the amps, so I assume it is setting up a loop. However, there is a seco...
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Jessie,
Actually the tendency of manufactures to isolate ground becomes almost common among any more or less serious manufactures nowadays. The main’s ground is so polluted in US hat it is scare… or even dungarees. I remember a few years ago when I...
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I would place my bet on common mode noise being carried on the safety ground long before blaming RFThe ground on the amp has been tried both lifted and present. I have reversed the AC cord using a cheater plug without effect. I have tried grounding t...
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[quote user="JOHNR"]You should take care that you do not daisy chain the ground leads.[...]A system that can work well is to create a single node or terminal where all ground leads are terminated. This terminal is then connected in turn to the elec...
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Considering the employments I would like to make in my installation after the floor will be done and the system is re-assembled I am very much thinking about some kind of new cable management solution. I have 21 powered components in my playback syst...
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[quote user="Romy the Cat"]
I do not know, I always have difficulties to talk with audio people about those subjects. They seems to have very strong and very definitive position how different driving tool affect sound of their timbales. The most ...
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Steverino
I live in a big complex (6 floor - totally 200 apartments) and I can not have my own dedicated ground .
there are three phases AC Power in the building and one of them is not good, sometimes the AC voltage goes over 230v and ...
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CORRECT AC POLARITY
June 17, 2009 — puristaudio System set-up
"I wanted to talk about a tweak that costs little or nothing to do, while having the potential of paying big dividends in terms of sonic improvement. It involves a ...
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[quote user="TonyB"]I disagree. I think it depends on the turntable. If I did not try it on MY turntable, I would not believe. My Verdier uses a DC motor "sloppy" mounted on grommets. The drive is linen thread. I have tried silk, different threads, 1...
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[quote user="Amir"]these are my findings about computer audio after some trial error:1. computer audio is very very hardware/OS/software dependent. computer structure is multi task (time sharing) and using it as a real time single task processor is n...
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You should take care that you do not daisy chain the ground leads. Refer to following text.From my perspective, you should treat the L and N leads as one type of circuit and the PE as a separate circuit. Electrical codes, rules etc do not insist tha...
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[quote user="drdna"]I have found the next obvious glaring problem, which is contributing to the muddy sound I described earlier. There is a mismatch between the two channels. The right channel is very slightly softer than the left with a ...
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[quote user="RF at Ona"]Reading about the sensitivity of your system to electrical power supply problems reminds me of the days when I used to make my own equipment as much for the learning experience as for the final result.One of the mundane things...
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[quote user="drdna"] What was more concerning is today some 60 Hz hum also re-emerged in the system, sounding like a vibrating cell phone going off in the back of the room. It was interesting how it was sort of localizable, but the hum is annoying. A...
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Perrew,
LCR is not active at all; it is the very same passive EQ as your RC? I think you a bit confused with terminology. The main logical explanation (there are many of them) is that capacitive filtration is very bad one and need to be minimi...
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[quote user="jessie.dazzle"]As a way of forcing myself to see the thing as a whole, I will start by converting this schematic to a 3D CAD model, illustrating each component and its relation to the others (with more distance between the parts than in ...
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Many audio publications grand some kind of idiotic rewards: “Product of Year”, “Editor Choose Award”, the “Best Sound at Show, “The Golden Ears” and so on. Trying to stay in the moronic awards-granting crowd I decided to form my own award: I would ca...
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Yes, the last cap of power supply much be on the side of load as it shell have a short path to ground. Without it you will have “less bass”, more crosstalk in case it is a stereo amp with single PS and a few other negative things.
With cables is mor...
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[quote user="Wojtek"]In regular off the shelf hi-fi system , be it a total lack of LF in your speakers or the "pinch" of dome tweeters or the midrange mud. Romy like all of us throws money on the problem and he usually chooses well regarded and...
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these are my findings about computer audio after some trial error:1. computer audio is very very hardware/OS/software dependent. computer structure is multi task (time sharing) and using it as a real time single task processor is not easy.even small ...
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[quote user="Romy the Cat"]I did not say how my saga with APS Pure Power regenerator finish but it never finished. Since the end of the last year the regenerators is sitting in my closet and I have sent the unit’s main board to APS people for the “re...
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In this section I will brief cover operational parameters of Purepower 2000 regenerator. I do not have a lot of fun to write this section but I feel that for sake of objectivity it is necessary. Also the next section – the sonic observations - might ...
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[quote user="PurePower"]p.s. Do not follow the advice of creating a new ground for the audio system alone. Multiple grounds can cause very dangerous, even lethal, unintended consequences.[/quote]
Actually it is incorrect. I do understand why a...
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[quote user="steverino"]Well I meant that in cases where the AC power wasn't simply larded with grunge but was irregular with outages you didn't need to be an audiophile to appreciate the product. Of course audiophiles find all kinds of things essent...
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[quote
user="JOHNR"]The common mode noise will lie between 5 meg and 8meg or
8 meg to 12 meg depending upon whether it is forward or backward mode
working.
It does not have much to do with the
30Kilohertz. [/quote]
The normal common mode no...
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what is audio ?
Audio is our reaction to sound , if there are audiophiles with different reactions then you may convince yourself Audio quality is relative to listener.
I think it is not true. The real quality exist itself .
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Please help me if you have any experience with PP3000.
now I have dedicated AC line (the line is three phase system ,phase 1 and 3 connected to home and phase 2 connected to my audio system) and a good cable replaced the building wire between ...
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[quote user="op.9"] Amir wrote:Hey , I judge the sound by myself , you judge the sound by yourself but we could have common area in our view if we be trained listener, do not search criteria if you believe good sound really exist. biased opinion is b...
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I predict a highly probability that a new wave is coming in high-end audio loudspeakers. The today’s high-end audio the loudspeakers field is in a complex stagnation, the stagnation that will lead to the need to invent a new ways to sell loudspeakers...
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[quote
user="steverino"] Later after the PP battery was replaced hum disappeared
forever.
[/quote]
Interesting. What made you
to replace the battery? The reasons I ask is a because an old buttery would not
be different for powers supply then ...
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