I was poking around on the web a couple weeks ago and ran across the claim
that the strength of a magnetic field drops off as the cube of the distance
rather than the square. I would have put big, big money on inverse-square.
Is this true? See
http://www.dansdata.com/magnets.htmSo even smaller distances are involved. This pretty much kills my old "will
my String Ensemble mains transformer erase my M400 tapes?" question.
Best Regards,
- Gene
M400S #1023
M400S #1213
M400S #1289
(two of which are away from home at the moment, to be on somebody's upcoming
CD)
_______________________________________________________________
Greetings All,
The MK-I/II speaker magnets are low enough and distant
enough not to cause any gradual degredation of tapes.
During normal operation ..... If a tape breaks,it will brush past
the magnet and partially erase the tape. LH Tapes 1-4 from
Gordon's ex-MK-I had noticeable drop-outs of audio.
Someone/something wasn't careful.....
The inverse squares law of physics applies to light , electricity,
and magnetism. Ken M. was taking the proper precautions
during MK-II tape change. I probably would have unbolted the
Wharfedales to make 100 % sure.
BTW, the JKMK6 has magnets even closer to the bottoms of
the M400 tape-frames within. No problems seen in two years +.
I installed mu-metal (mag. shield) adjacent to the spkrs.
to preclude a future disaster. My pro-active policy of safety.
That's why we 'Tron users cannot stress enough the need to
keep headblocks demagged,non-magnetized hand-tools,
electrical precautions when installing headblock cable,
yada,yada, yada.....
Cheers, Jerry K.
(MK-I #124, 14,500 lines of flux within Spkr. RS/12/DD model. )