SE Electronics Gemini II - large diaphragm dual tube microphone with cardioid pattern, one 12AX7 valve in the input section and one 12AU7 valve in the output (in place of the transformer). Includes power supply, shockmount and case. Frequency Response: 20Hz-20KHz. Sensitivity: 12.6mV/Pa - 38 ± 1dB (0dB=1V/Pa 1000Hz). Impedance: 200 Ohms. Equivalent Noise Level: 16dB (A weighted). Max SPL for 0.5% THD@1000Hz: 130dB