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.