Densen DeMagic CD revisited

Done, Dean! (Dean, done? Been and done? - something like that anyway). So, the circulation list now reads:

Henry T
My name is Ron
Andrew Weekes
Paul Ranson
Gambit
Uncle Ants
Bob McCluckie
Wolfgang
SCIBD
...
Penance

 

Much snipping to keep it short


I am sorry I saw red at the amateur remark, I have had a belly full of audiophiles doubting basic science. Much of which is taught in primary school

Perhaps it would be a good idea to start again.

Doesnt mean I wont point out major errors though

 

Tones, seeing as your being a gent, how about I send you something to try, I'm sure the forum trusts your ability to 'Tell it like it is'. fancying turning the sceptisum up a notch for me.
It would be interesting to hear your thoughts on this, how about it sir?. Tones the younger & thicker.

 

OK, I'm game, provided it isn't a roomful of equipment that I have to send back! What is it, O Namesake?

 

Any relation to That Other Stebbings, David, of the RIAA, who has his name on about ten zillion US patents, including means for stopping piracy? (I can see the smoke coming from Mike's ears in Lisbon from here...)

 

Stuart, sceptisum is part of life, if we didn't have it, then this place (and others would be boring to all) and some what dull & lifeless.
A lot of audiophollery is just that (My spelling didn't carry the same grade as my engineering skills ), total Bollox, and there a lot o companies/indivduals that 'exploit this' too strong?, market it then.
No problem Stuart, thats what makes Z/G different, plus a large pool of alternitive knowledge and diverse poeple.
I'm sure you have some valueable knowledge that a lot of guys (and hopefully visa versa) can appriecate. Wm

 

No, not my test rig, how about some top quality snake oil cables 2 sets, both analogue interconnects. A month loan should do it ? Wm

 

The idea is that the de-magnetisation occurs through the whole system, not just the CD player. If you turn the volume off then you won't be sending the signal through the speaker cables and speakers, and possibly have a reduced effect in the amp output stage.

For the record though, I have one of these discs, have tried it, and with my humble ears/system could not honestly say I heard any difference. So far as I could tell, all the disc succeeded in doing was filling my room with a truly horrible sound. [Anyone seen a fingers in ears smiley? I could do with one here...]

 

OK, Tony, happy to try. Honest opinion guaranteed!

 

Diabolical, isn't it? However, I always thought that a magnetic field could be removed by the application only of another counteracting magnetic field, for example, the degaussing cables used on ships in the Second World War to counteract magnetic mines. Can a simple electrical signal passed through a component have that effect? Or is my electromagnetic ignorance showing?

 

No and No.

 

Tones, you got my lines of flux all in a dither now, prehaps a liberal sprinkling of ferrites may help here

 

Anytime there's a current there's a magnetic field.

Usually degaussing involves an alternating magnetic field much greater than that you want to remove. You apply it and fade it away. The result is that the permanent magnetism that's built up is erased. It's exactly like erasing tapes. Your TV and any CRT monitor will have a degaussing coil, sometimes with a button to trigger it manually, more usually at power up. You can hear these working...

So if the insides of my TV and every screwdriver I've got can end up magnetised it's plausible that the insides of my hifi might suffer the same fate. What's implausible is that playing a signal through it will generate sufficient magnetism to degauss. And what's unsaid is why it might matter.

Paul

 

Given that the demagic signals are designed with magnetic fields in mind, might it not possible they generate stonger fields than normal music? I mean, if say the signal was such that instantaneous currents were larger, by careful phasing of the different frequencies present, you'd get stonger fields wouldn't you. I guess your saying you'd need a MUCH stronger field for the effect though?

Presumeably the logic is that any magnetic field is going to have an affect on any moving charge, although for the field strengths we're talking here they've got to be pretty damn small.

 

Playing devils advacote' here When you press the degauss button on the monitor, you first get a quick burst of a large magnetic field pattern, then this subsides to smaller less frequent patters, as in a big frequency sweep maybe ?? starting off large and deminishing, the demag disc (if you analyised it, Not me guv, honest ) does pretty well much the same thing, starting with the large louder lower frequencines, then slowly tailing off into the upper reaches, coincedence?.
I do believe that the internal components insides electronics suffer magnetic build up (how much/frequent I can't say, does it have a determantal effect on the sound?, maybe/maybe not), but what about all the caps, does this not instigate a phase change at every turn??.
Has anyone done a electromagnetic spectral sweep of a cdp/dvd/pre/amp while actually running, does it matter ? dunno, although it ceratinly would put paid to a few myths I feel
Weather you believe the disc works of not, you gotta say, it's invoked some lively debate. Wm

 

The only problem I have with that view, Tone, is that degaussing relies on the deliberate creation of a magnetic field to counteract an induced magnetism. It seems to me that this is where your idea breaks down, in that the components of a hi-fi contain no elements that are there specifically to generate this counteracting field. Perhaps Densen has them in its own CD players, but I doubt whether anyone else does.

Whether there is sufficient induced magnetism to worry about would depend on the quantity of ferromagnetic material present in the current path and how much of this would be subject to direct current.

 

I'm not batting for either team here Tones, just merely hypothosisng (MR ranson would be so proud ) again, I can't confirm at all what I've given a 'possibility' is even close to outcome
I do agree with your arguement, I'm not a field core specialist, so not qualified honestly comment, I can only speak from more own experiances with it, I do find it very useful after preforming modifications to various pieces of eqipment, after giving them an hour or so to settle in the run up cell, I give the demag disc a spin matter of course, to me it seems to be the equivilent of 'Blowing the cobwebs out' remembering my ol' man's 1600 E MK II cortina, once a month up a deserted by pass he gun it to 100 mph, always seemed better for it) prehaps the idel jet had a spot of grime in there form the dodgy old tank
But I do feel it helps, I use the disc at home once a week, I set it to play as I leave in the mornings
The guys at work had a good laugh when I brought in in over a year ago, now 2 of them own one, this in itself proves nothing ,I know, but these guys are that bad, they supply the jockey club direct (blinkers)
The ERS sheets are another voodoo thing, Ian found no difference, I also lent him a sheet of tin foil doubled over and sealed in card board, that made more of a difference fro him, yet here, the Tin foil, did very little to my alternitive psu's, yet the ers was superb, prehaps it absorbs a different part of the RFI interference spectrum, that the foil doesn't in the digital sources I used it with?, It's a demon with SWPS, and clock curcirts. but I could lend you a sheet as well, stick it on top the Linn/588, on the P1-A it's great, ontop the belcanto is great to, on top the wadia not much at all (but inside fab), yet Timpys teac wow, you'll laugh the pace digi box (satalite) (again smps) nice not just the sound, but the picture to, I doubt If you'll notice a difference, but I send some over just so your can poo poo it fairly .
I do also firmly believe that some people really can't tell a difference unless it's chalk and cheese, but age is not a bigger factor as big alocate to it to be . Tone

 

Densen CDP do indeed have some sort of demag gizmo in them [or at least a light comes on saying 'demag' when you load a CD]. I couldnt say what it does; and it doesn't audibly output through analogue or digital outs.

You can put me down for the 'crock-o-shite' camp - at least to wind up Penance anyway...

 

I think it is decaying mains, so the frequency is constant but there is some sort of thermistor type thing in circuit.

When I worked at the BBC we had a degaussing device, basically a big coil hooked up to a mains lead that you pressed the switch on, waved about the monitor and slowly withdrew before switching off, very amusing to watch.... I think the decay is the key rather than the frequency. Using this device while fitted with internal metal objects wasn't recommended....

Paul

 

Infact, the 'Demag' light is now the only one that works on my Densen.