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I'm using a magnetic resonance imaging (MRI) machine to fMRI trial subjects while they experience club-like conditions. This means I need loud, high-fidelity speakers, flashing multicolored lights from multiple directions, etc. Big speakers usually means big magnets, obviously a problem in an MRI machine. Any ideas?

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  • \$\begingroup\$ Do Faraday cages work for magnetic waves? Otherwise, keep them as far away for the machine as possible, and crank up the volume a bit more. The field decays exponentially. \$\endgroup\$ – Gerben Jun 8 '14 at 16:31
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    \$\begingroup\$ Not in an MRI machine. It uses superconductors to maintain the massive fields \$\endgroup\$ – TheEnvironmentalist Jun 8 '14 at 16:33
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    \$\begingroup\$ Can't you just spill drinks on them? \$\endgroup\$ – Samuel Jun 8 '14 at 16:33
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    \$\begingroup\$ You've seen the headphone solutions? Seems like you'd need headphones in any case. MRIs are damn loud themselves in a very non-techno way. \$\endgroup\$ – Samuel Jun 8 '14 at 16:44
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    \$\begingroup\$ Couldn't you just use the MRI as the magnet of the speaker, i.e. use a bare coil on a cone? \$\endgroup\$ – Ignacio Vazquez-Abrams Jun 8 '14 at 18:29
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One for the historians amongst us.

One of the companies I worked for (many years ago) was founded by a brilliant engineer by the name of (Sir) Charles Parsons. He invented many things but perhaps one of the strangest was the Auxetophone (originally patented by Short) - a compressed air gramaphone sold in the U.S. as the Victor Auxetophone. (see http://en.wikipedia.org/wiki/Compressed_air_gramophone)

enter image description here

There's even a Youtube video for your entertainment.

http://www.youtube.com/watch?v=J7SV65DFNy8

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