Combination tones arise at a place well separated from both primaries.

Evidence

Primaries of 1757 Hz at 85 dB and 2:~20 Hz at 80 dB show characteristic places of CZ1 = 12.3 Bark and CZ2 = 14 Bark, while the characteristic place of the cubic difference tone is cZ(2h _ h) = 9.6 Bark. This means that the level-place patterns are separated, as can be seen in Fig. 14.8. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 1590

Categorization

• QUESTION: The difference tone’s characteristic place sits well below either primary — a concrete worked example (1757 and 2280 Hz primaries, 9.6 Bark output) worth revisiting for a worked psychoacoustics example.