Studio Projects C1 Mk2, new revised series; large diaphragm condenser, Sensitivity 14mV/Pa=-37dB, max.SPL 131dB by 1% THD@1000Hz, S/N 77dB, switchable -10dB or -20dB pad, 6dB@75Hz or 150Hz high pass filter, transformless circuit, frequency response: 30Hz bis 20kHz