Quote:
Magnetic shields are metal sheets that have high magnetic permeability, but are not likely to become magnetic themselves in the presence of a long-lasting field, that is, they have low coercivity.

So... since the fields are only on when the arcade games are on a simple piece of sheet steel would do?
I always assumed that the 'shielded' computer speakers just had a couple sheets of steel inside the case. It wouldn't need to be thick at all.
Cris- can you slide a sheet of steel between the machines for a quick test?
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