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Headphoneus Supremus
The magnetic field shouldn't be a problem. My Clearaudio TT has magnetic feet too. It is a good idea, but there are more ways to skin a goose (or cook it?) And there are cheaper ways.
You can use sorbothane feet. A very absorbing type of 'rubber' that you can get rather cheap in the form of non-audio related stuff. Just blocks or inlay soles or w/e.
What I've done is take a heavy slab of natural stone (granite) from the garden centre, DIY (just one big tile) or stonemason (is that the correct word? ppl who make headstones etc. they often have pieces leftover). Support it with 2 stiff supports on 1 side (spikes, cups, marbles) and soft suspension on the other (styrofoam and/or springs). That way you can tune the frequency by moving the supports. With a substantial weight the resonant frequency is about 2-5Hz, the same as slamming doors, walking sounds etc. If you place the spikes in front (they function as a hinge), you can move the springy support in the back out of sight. Move those forward, closer together, and you make the frequency lower, move them out>higher.
With the 2 spikes you fixate any sideway movement, and for the the springy parts you can use whatever strikes your fancy without risk to unwanted sliding of. You can use pingpong balls, halved squashballs, pieces of styrofoam, airbags used in packing (but those tend to deflate over time), maybe even a bicycle inner tube.
FYI; I use a piece of leftover black granite under the Clearaudio because they absorb different frequencies. One glass door in my living-room gives a particularly nasty thump that makes the needle skip every time. This construction completely eliminates all problems.
You can use sorbothane feet. A very absorbing type of 'rubber' that you can get rather cheap in the form of non-audio related stuff. Just blocks or inlay soles or w/e.
What I've done is take a heavy slab of natural stone (granite) from the garden centre, DIY (just one big tile) or stonemason (is that the correct word? ppl who make headstones etc. they often have pieces leftover). Support it with 2 stiff supports on 1 side (spikes, cups, marbles) and soft suspension on the other (styrofoam and/or springs). That way you can tune the frequency by moving the supports. With a substantial weight the resonant frequency is about 2-5Hz, the same as slamming doors, walking sounds etc. If you place the spikes in front (they function as a hinge), you can move the springy support in the back out of sight. Move those forward, closer together, and you make the frequency lower, move them out>higher.
With the 2 spikes you fixate any sideway movement, and for the the springy parts you can use whatever strikes your fancy without risk to unwanted sliding of. You can use pingpong balls, halved squashballs, pieces of styrofoam, airbags used in packing (but those tend to deflate over time), maybe even a bicycle inner tube.
FYI; I use a piece of leftover black granite under the Clearaudio because they absorb different frequencies. One glass door in my living-room gives a particularly nasty thump that makes the needle skip every time. This construction completely eliminates all problems.