Quote:
Originally Posted by roboruler
Also fans will not work, because of the significant spool up and spool down time of the blades. A solenoid is off-on-off quickly a fan is not off-on-off quickly at all.
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No comment as to whether this would actually work, but if you want to avoid the problem of spin-up/spin-down time you could have a constantly spinning fan in a tube with the out-flow end covered so the air doesn't flow through the calliope. Then a small solenoid or something could open and close the cover to allow air through. Just an idea; still would be really complicated and a lot harder than a big set of speakers.