Golden Age Audio Project R1 MK2, Ribbon Microphone, Passive with transformer, Directional characteristic: Figure 8, Frequency range: 30 - 18000 Hz +/- 3 dB, Sensitivity: -52 dB (0 dB=1V/Pa) @ 1 kHz, Maximum SPL (<1% THD @ 1kHz): 160 dB, Output impedance: 600 Ohm sym, Recommended load impedance: > 3 kOhm, Dimensions: 69 x 185 mm, Weight: 1.4 kg