The levels of the difference bands,fh − fland2(fh − fl), generated by a pure tone and a narrow band of noise, have been estimated in a manner reported in previous papers (Greenwood, 1971a, 1972a, 1972b). Results and conclusions follow: (a) Combination bands of the formfh − fland2(fh − fl)vary in level as functions of stimulus parameters in ways very similar to the variation in level of the differencetone,fh − fl, produced bytonalprimaries, as measured by cancellation techniques. Difference band levels are rather insensitive to increases of primary frequency ratio in the ranges explored (about 1.35–1.85). Difference band level obeys different functions of primaryintensitydepending on whether one or two, and whether the upper or the lower, primaries are varied. When the lower primary level is varied alone, square‐law behavior is observed, in agreement with Goldstein (1967) and with Zwicker (1955); when the upper primary or both primaries vary, curves depart from square‐law behavior in near agreement with Goldstein. Békésy's 1934 observations (1960) and Wenner's (1968) results suggest a conceivable explanation that might resolve some apparent discrepancies among results of Goldstein, Zwicker, and this paper whenbothprimaries vary. (b) At primary levels exceeding about 60 dB SPL, combination tones of the formn(fh − fl)and combination tones of the form(n + 1)fl − fhwill exist simultaneously, and since they lie in the same frequency region they will interchange places, with varying interactions, as primary ratios are varied—producing perceptual effects relevant to higher‐level phenomena of consonance generally and to the beats of mistuned consonance specifically.