Mellotronists

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.htm

So 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)

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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. )