How can i disable the internal speakers without voiding the warranty?

The students here annoy other students trying to study, I have made an extension for the headphone so that it is mounted under the monitor, facing the front and hot glued the headphone jack to the back, but the students ripped out the extension and threw it away so that they could play very awful music and annoy everyone.
How can I disable the internal speakers on our imacs without voiding warranty? There has to be a way!
Thanks-

Have you considered corporal punishment? One instructor I had in high school, when he had detention duty, played classical music an operas all during detention. He was quite "evil". He would have some slow "sleepy" music going for a bit, then it would throw in something to wake every one up like the 1812 Overture or something, and repeat this a few times...and have the music loud enough to prevent talking. Many detention-ees thought that was "cruel and unusual punishment." (LOL)
But to your question. Since opening the case would normally void the warranty (unless you can find a empathetic Apple technician), what I would suggest is a "sleeve". Imagine some sheet metal and form it into a rectangular tube. The tube would closely follow the shape of the iMac covering all the cable ports. Then bolt the tube and iMac to the table. (Or at the very least, bolt the tube to the iMac.) Basically, make it so that there little room between the tube and iMac, that no one could access the ports without removing the tube. You'll also need to secure the cables to the tube so that no one can just pull out the cables, yet leave enough slack to allow for removal of the tube for maintenance. Even if the metal is not a full tube, but the Mac and metal is bolted to the table in such a way as to prevent access to the ports could be sufficient deterrent. If metal is not possible, then perhaps plastic or wood.
I realize that is requires some work, and there is a drawback as pranksters could start dropping stuff inside the tube. Perhaps just have a clear plastic "wall" preventing all physical access to the Mac. Only a USB extension cable for the keyboard/mouse. Use Remote Disk sharing to mount CDs, if necessary.
Some thoughts, anyway. Good luck!

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