d:dicate 2011A Stereo Pair with Clips and Windscreens in Peli Case. The ST2011A Stereo Pair with 2011A Cardioid Microphones from DPA is a kit that contains two 2011A Cardioid Microphones, two microphone holders, two windscreens, and a Peli foam-lined carrying case. The microphones are matched within a sensitivity of ±1.5 dB to provide accurate sonic reproduction. There is a cardioid polar pattern for obtaining several stereo miking techniques, including XY patterns and ORTF. Sensitivity selected pair Maximum stage separation and level control Pair is matched within ±1.5 dB Includes Peli carrying case DPA Microphones ST4006A Specs Microphone Operating Principle Pressure Gradient Capsule Condenser Polar Pattern Cardioid Performance Frequency Range 20 Hz to 20 kHz Maximum SPL 153 dB SPL Impedance 200 Ohms Load Impedance 2 Kilohms Sensitivity -40 dB at 1 kHz Dynamic Range 117 dB Signal-to-Noise Ratio 74 dB A-Weighted Equivalent Noise Level 20 dB A-Weighted33 dB ITU-R 468 THD < 1% CMRR 60 dB Power Operating Voltage 48 V ± 4 V Operating Current Consumption 2.8 mA Physical Operating Temperature -40 to 113°F / -40 to 45°C Operating Humidity 90% Dimensions ø: 0.75 x L: 7.8" / ø: 19 x L: 198 mm Weight 5.78 oz / 164 g Packaging Info Package Weight 3.45 lb Box Dimensions (LxWxH) 12.2 x 8.7 x 4.1"