The SE300 B is the pre-amp for the Blue Line Series capsules CK91, CK92, CK93, CK94 and CK98. This system is designed for excellent audio quality and maximum flexibility. Its robust Modulock™ bayonet coupling allows quick and easy changing of the capsules. With switchable bass roll-off with three positions: flat, 75Hz and 10db attenuation. Includes CK91 capsule, small condenser capsule with a cardioid polar pattern, frequency bandwidth 20 to 20000 Hz Equivalent noise level 17 dB-A Sensitivity 10 mV/Pa Signal to Noise 77 dB-A Electrical impedance 200 Ohms, Powering Interface Voltage 9 to 52 V. Includes mic clip and wind sock, box and manual.