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lab recording, 13.7.1988, 23°C, SonyWM-D3 with QMC mini bat detector at 25 kHz (tape: UX-Pro90, tape no. YU4/88:300-320) lab recording, 20.8.1989, 24.5°C, Kenwood KX880HX with AKG D202 (tape: M-MX90, tape no. KW09:31.25-37.25, microphone filter below 100 Hz) lab recording, 19.2.1991, 25°C, Kenwood KX880HX with AKG D202 (tape: MRXpro, tape no. KW39:07.00-13.00, microphone filter below 100 Hz) |