I was really looking for Shepard's tone. But it is composed of a series of harmonics, and I'm ready to go out for the evening so I won't be around inform someone of the 100% correct answer, so I'll give it to you.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris