Yes, the hottest, and also the coolest. :yes: It should easily spark your interest in, and give you a burning desire to experiment with, sound waves!
I wonder if some extra care with making the holes "perfect", and some kind of shielding to reduce or direct external airflow better, might improve the precision/shape of the waves.
Hhhmmm...a little off topic, but is there any chance of getting a Jacob's ladder to simultaneously work as a plasma tweeter (or more appropriately put, vice-versa)?