Originally Posted by tjk3030
Wasn't that the speaker that almost killed Nelson Pass?
The "ion cloud loudspeaker" used photocopy
machine ionizing nichrome wire strung in a flat
array a bit like a window screen, but with more
space between the wires, and charged to a variable
DC potential of about 10 KV.
This screen developed a layer of ionized air, and was
enclosed between two stators, much like an electrostatic
speaker, except that instead of a charged plastic
you had a charged semi-flat layer of gas, and you could
push-pull it with high AC voltages on the stators.
It worked fairly well, and gave new meaning to the word
It also had several flaws, one of which did result in a
trip to the local emergency room with breathing problems
similar to those sometimes experienced by arc welders and
caused by extended exposure to ozone.