Disc Demagnetizer

[twich54]

Ok before you think this analog junkie has fallen off his rocker let me start by saying this little device (Acoustic Revive RD-3) was left for me to play around with by Derek (taxomega) , when he and his buddy Anthony (asindc), were over to my place last Sat.

We had a good time listening to a variety of analog and digital, that was untill I discovered that I had an indooor swiming pool in my laundry room ! Thankfully my best friend is a plumber !

Anyways I can't be sure if this "de-mag" thing has an effect or not......on one hand I'm thinking that I am hearing an ounce or two more clairity, resolution, detail, call it what you want. Then I think ....ah....mind games ?? it would be nice to A / B, via DBT two copies .

has anyone else used or have experience with this device ? What conclusion have you drawn ?

 

[SteveInNC]

I have no idea what it is, but it looks like it is intended to (theoretically) do something to CDs. Assuming that that is its function, it does absolutely nothing useful.

CDs are made by pressing a series of pits and lands into a polycarbonate disc, then using vapor deposition to sputter a thin layer of aluminum onto those lands and pits. The whole thing is then covered with another layer. As such, there is nothing with any magnetic potential to correct. Neither the aluminum nor plastic have magnetic properties.

CDs are read by a low-power laser beam that bounces (or not) off of that aluminum surface: a reflection counts as one state, a non-reflection counts as the other, with state-transitions yielding a series of on/off bits which are accumulated into data words, then error-corrected.

CD-Rs use a dye layer in place of the aluminum pits and lands of a mass-produced CD. The reflectivity of the dye changes when subjected to strong laser light, much higher power than the reading laser.

For CD-Rs, reading is the same: transitions between reflective/non-reflective encode the digital data.

Yes, I did read their website just now and don't believe a bit of it. Even if you buy into the "magnetic dye" or "impure aluminum", that has no bearing on the optical properties of the disc. Further, such miniscule fields would be swamped by the electrical components in a typical player.

 

[tonepub]

I have one in my garage that I've never had any luck with. I use the furutech on my LP's, but have had no luck with it with CD's, SACD's or DVD-a's.

And Ive tried every combination of aluminum, gold, CD-R, lots of writing, no writing etc etc. We even did it with identical Wadia 581 CD players, identical discs. Treated one and not the other and no one could tell a diff.

I love gadgets but this never produced any results for me.