SE Electronics X1 Reflexion Filter Project Studio Bundle - X1 microphone and Reflexion filter project studio. X1 large diaphragm condenser microphone with hand-made 1" diaphragm, 20Hz-20kHz, -32dBV/Pa sensitivity (25.1mV/Pa), <200 Ohms impedance, 16dB(A) equivalent noise level, 125dB maximum SPL (0.5% THD@1000Hz), requires +48V phantom power (±4V), XLR connector, includes swivel mount (optional shockmount available (Isolation Pack- # 345059)).