Pitch of a tone is defined by the matching 40 dB reference frequency

Evidence

The sensation “pitch of pure tones” can be described by that frequency (a physical value) of a pure tone at 40 dB SPL, which produces the same pitch as the pure tone in question. This value is called “frequency pitch”, H F . — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 683

Categorization

• DEFINE: Defines the operational reference used to quantify pure tone pitch — the 40 dB SPL matching criterion.