It does... sometimes quit a lot. I use it when doing T&M... where a clean, noise free, grnd loop free system is needed.
The emi/rfi issues that are field coupled are a CM issue which gets into power as well as signal carrying cables, etc. Good shielding and grounding is needed.
Going deeper ---- Unbalances in cables and I/O convert CM to DM and then gets amplified -- or attempts to.
THx-RNMarsh
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yes, of course. and all competitors as well. But the MOnster that are best are 5100 and up (number-wise). Filtering is just as good but fewer of them and no isolation transformers. Only 7000 has ground isolation transformers.
Enjoy.
-Richard
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It would certainly be extremely low frequency radar of which there are some, but not generally for aircraft or weather purposes. Demodulation is a good possibility. It is a chirp-like waveform on the scope, but I am suspicious because it it only a 100MHz scope, not really made for high RF frequencies.
Also, I see spurs in an FFT of my unshielded out-in-the-open Chinese DAC board that were not seen when testing over at Richard's place in Cool. (We did see some other spurs there at -130dB that mostly went away when I held my finger on the DAC chip. I wanted to investigate that further here, but I have other problems to solve first, obviously.)
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Whilst not wishing to cast aspertions on Marks hearing abilities, the plural of anecdote is still not data. And a big hunk of metal power conditioner sitting there is a hefty placebo. None of which is to say these things don't work, but when snake oil products get the same class A ratings as properly engineered ones you have to wonder.
I already told you my approach, which is mains only to the blueray (double insulated) and the power amps. Total wuss out but neatly sitesteps mains problems in return for other ones. My system my choice and I make no claims for veils lifted or wife in kitchen feedback.
But my reason for bringing it up was lest people think that said big hunk of filter means they don't have to do the basics inside their equipment. Transformer snubbing, lining up the ground connections to the filter capacitors properly etc. Get these wrong and no end of isolation on the power feed will fix that. And I have yet to find measurements comparing an isolation transformer with an electrostatic shield on the internal toroid. They must be out there somewhere.
The other issue with isolation tranformers is I am not convinced they are covered in uk by the wiring regs for domestic premises. I need to check. They changed the rules about 10 years ago that all changes to wiring needed to be signed off by a certified sparky. If it's not in the book sparky won't sign it off. That I need to research.
Placebo affect? I invited Mark to take a second listen ---- next time I had an -7000 in the system. But only after he heard it and decided it was definitely better, that I showed him what I did...and I described the technology used.
So, the assumption that he saw and was influenced by a big hunk of metal simply isnt true. Dont even know why you would assume that.
The -7000 was sold in UK, EU countries and every where else. It had multiple UL/VDE/CE etal.
The choise is there to fix each and every product individually…. including other noise producers on the ac power line which are On but not part of the music system. Computers, chargers, dimmers, washers/dryers, lighting, TV in other room, video games, etc. They all put noise onto the ac power line.
THx-Richard
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I was talking about when anyone takes one home and plugs it in. You can't fast switch an isolator and with no measurements of how the output of the system has changed it is a valid option. We listen with our eyes, this has been shown again and again.
FWIW TV is off when I listen to music, I have no dimmable lights, no industry nearby and share my transformer with one other house. I really should measure my power cleanliness for a laugh. Where are suitable circuits for this published?
There are two sides to every story, at least. My story is a little different than the one I just read, but that's okay. I don't want to nitpick or talk out of school.
However it came to pass, as I said when I got home with Richard's old prototype I was in no hurry to try it because I didn't expect it to do anything. The next day sometime I thought well may as well get it over with because there isn't likely to be any difference. I was surprised to say the least. It was more like what the h**l just happened. It was small but the there was some spitty brightness gone and I flipped up the tissue paper to make sure the tweeters were still okay. It sounded smooth, maybe too smooth I thought, maybe it is having some adverse effect and rolling off the highs somehow. Well, no it was just that some harmonic distortion was gone and I just sat there and listened for awhile to get used to the new sound.
Anyway, the experiment isn't over, rather it has barely started. The 7000 should be here is a week or so and I want to try it on the stereo yes, but also on my workbench. Just want to see if any effect on my little Chinese DAC project. No idea what will happen, but we'll see. Maybe the spurs will change some, don't know. I'm just poking around to see if I can get the attention of anything or not. I'll report in when there is something new to say, but it may take a week or more.
Oh, I found found some documentation of the AC line monitor box Richard loaned me. Looking at it closer it had a part number on it so I looked it up and found a manual. Also looked inside at the circuit. Found an apparently identical device with a different name, but this manual had a schematic it looks like the same as for the circuit I have here. It is showing some noise on the line and I should be able to see how the 7000 handles that noise.
By the way, the prototype conditioner Richard loaned me was something I looked at with the monitor box. Turns out all the ports on that conditioner don't look the same in terms of the filtering they are doing. I haven't opened it up to see why.
Mark, your reaction was the same as the people at Stereophile had when applied to their reference system at their head -quarters. WTF?!
It is amazing how audible it is. All in a quest for more accurate sound. But, as Scott says, not many people would be interested. Only for a minority of other extremists.
IHO. Welcome fellow extremists.
THx-Richard
It is amazing how audible it is. All in a quest for more accurate sound. But, as Scott says, not many people would be interested. Only for a minority of other extremists.
IHO. Welcome fellow extremists.
THx-Richard
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Negative expectation bias reversed.
Curious how effects of mains junk/stuff gets through internal AC filter module, psu and final regulators.
Getting rid of mains borne junk/RF is one step, after that other filtering sets the tone.
It does not have to be a fully fledged hi-fi....radio cassette, small powered speaker etc etc, even a clock radio will benefit.
Clean power is the first step in achieving pleasing audio reproduction.
Dan.
Sounds like my situation also. I live far from any city. Off a rural road on a couple acres with no industry, no other homes close, etc. Very quiet here.
You can cap couple a step down power transformer and look at the low voltage secondary. Many transformers go to 100KHz at least. The cap is just to atten 50-60Hz from passing thru. Look at it with FFT and/or spectrum analyzer.
THx-RNMarsh
Richard, don't loose your time.
Whatever you will say, and even if it has been hundred times verified by hundreds of people*, it will be people (always the same) to negate and pretend "it is a placebo effect".
Note that , of course, they had never tried to listen and measure the thing that they deny.
An other syndrom of the conspiracy theory.
*Isolating transformers are used since decades in many recording studios.
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Strange reaction.
Do-you consider measuring HFI components more important than listening music with them ?
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Why is it nothing ever changes? Don't answer that
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