Lewitt 0dB Self-Noise Large-Diaphragm Studio Condenser Microphone (LCT-550) Highly precise calibration of capsule and electronics means that any two microphones from this series will always form a matched pair at +/- 0 dB Precise transient response thanks to the 3-micron-thin, gold-layered, low-mass, 1-inch Mylar diaphragm Extraordinarily sensitive: capture even extremely weak signals with great precision and detail Cardioid polar pattern for effective rear sound rejection 140 dB dynamic range Max. SPL of 155 dB (A)