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lab recording, 28/6/1989, 24°C (Kenwood KX880HX with AKG D202, tape: S-MES60, tape no. KW03:20.00-31.37, microphone filter below 100 Hz) lab recording, 5/6/1989, 25°C, 8 males and 6 females in one box (Kenwood KX880HX with Universum mono, tape: CMII90, tape no. KW05:00.00-07.00) lab recording, 6/6/1989, 26.5°C (Kenwood KX880HX with AKG D202, tape: CMII90, tape no. KW05:07.10-18.40, microphone filter below 100 Hz) |