Looking into the plasma/laser paper and it mentions 77.2 dB at an insanely close 22mm distance. Background was 55.7.
http://arxiv.org/pdf/1506.06668v1 Page 9.
It sounds (hah) like it wouldn't be pleasant if you have your head near a full display in operation, especially since the noise scales with the resolution/brightness. It would be interesting to see how quickly the noise drops off over distance. You are looking at something between a home sound system, vacuum cleaner, or highway traffic at that volume level. Tolerable but not pleasant.
A friend of mine built speakers that ionized the air and then used some mechanism (electrostatics? voice coil?) to move the air directly; kind of a coneless speaker. It didn't get that loud and made a lot of ozone.
It sounds (hah) like it wouldn't be pleasant if you have your head near a full display in operation, especially since the noise scales with the resolution/brightness. It would be interesting to see how quickly the noise drops off over distance. You are looking at something between a home sound system, vacuum cleaner, or highway traffic at that volume level. Tolerable but not pleasant.