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In Reply to: RE: Hey ! posted by unclestu on February 12, 2013 at 22:58:42
The picture is one of two racks and includes the rack with the turntable. Avoid using the magnets entirely on this rack or can they be placed away from the turntable?
Thanks for the tip which will be applied immediately.
Follow Ups:
use any magnets on the reack holdong up the TT. Apparently the magnets wil generate a field through the rack and actually affect the cartridge.
Place the magnets on the rack to the left, midway on all the cross pieces. The effect may not be as great because your primary sound producing components are below the TT.
If ambitious, try moving your preamp and amp to the left rack and you should hear quite an improvement. I generally like to place my phono section directly under my TT for best sound. Your CJ preamp (which I really like, BTW) has its power transformer directly under the tonearm, even though its isolated by many inches. Generally you will notice a slighter more open sound quality.
Have fun
Stu
Maybe a dumb question but how do the turntables using a magnetic levitation bearing setup get away with it not affecting the Cartridge since it is so close ?
Does it matter how close they are the interconnects?
Not really. The steel in the racks will absorb the greater part of the magnetic field. Remember magnetic fields would rather travel through ferrous objects than through air. Plus if you don't like the effect just remove the magnets....
Stu
Stu, do you know of any danger in attaching a magnet directly to the metal casing sides of electronic equiptment such cdp's, preamps and amps?
kendo
but I generally would discourage adding a magnet to the actual chassis. There's enough EMI going on inside the chassis so you need to be careful about application. I am not fond of adding more possible EMI to complicate the issue. My mind has difficulty in attempting to conceive of all the permutations which can result
That being said, the primary source of EMI interactions is the power transformer. When placing magnets on the stand I am attempting to restrict the magnetic field generated by the transformer. The fields can actually induce a current flow in the steel legs of the rack. As a matter of fact, I normally ground the metal legs of my racks and stands with some audible, abit small gains in performance.
In experimentation with the grounding, I was also playing with magnets and found that the static field they impose can restrict the extent of the field generated in the rack legs. Remember that magnetic fields, in particular, prefer a ferrous object and would rather travel through them rather than air. Their field is thus extended when in the presence of ferrous objects.
Many high end components thus use non ferrous alloy chassis as a result (aluminum in particular). In fact, I believe a lot of DIY projects sound good because they use woods and plastics rather than steel. Even brass is better than steel in combating this magnetic induction, as it addresses at least the electrical component of the EMI generated.
Although it would a bit long to address the entirety of your seemingly innocuous question, bear in mind something like a CD player has a lot of motors involved in operation. You have the spin motor, the focus motors, the traverse motors and they all work by a magnetic induction principle. You don't really want to introduce another magnetic source. It tends to throw off the feedback systems.
You can do work to confine the magnetic field however. Things like the old VPI brick which consisted of a nicely dressed laminated steel plates work well in containing magnetic fields. Except for the appearance you can do the same with transformers removed from equipment. Place the transformers with the lams parallel to the motors (90 degrees to the axle) and you will hear a change in sound. A toroidal core works better over motors because the magnetic field gnerated by a motor is toroidally shaped centered on the spinning axle shaft. I used to buy old unmagnetized speaker cores for this very purpose and they work well and give a bit more detail and dynamics. The results are more impressive over TT motors, although they work equally well when placed under the motor too, even on a CD/DVD player.
The old transformers also work very well over your power transformers in your components. Just orient the laminations so that they run parallel to the laminations of your power transformers. Short out the windings, or cut them off.
Have fun experimenting and I would love to hear of your experiences.
Stu
Beware of what you ask for, you just might get it!!! Thank you for your detailed reply, although it was a little beyond my limited scope of knowledge. However, so that your efforts won't be wasted, I promise to ponder the material and try to put it to some practical use. Will definitely report if I stumble upon a AHA moment.
kendo
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