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The C391 B high-performance small-diaphragm condenser microphone is a combination of the Blue Line Series CK91 and the SE300 pre-amplifier. The microphone has a cardioid polar pattern, a low self-noise and very good transient response for a bright and brilliant sound. It also features the ability to quickly interchange its capsule with one of the other capsules of the Blue Line Series, making it an excellent mic for demanding broadcast applications.

The C391 B provides a switchable bass roll-off/attenuator with three positions: flat, 75Hz and 10db attenuation.

- Precise cardioid polar pattern: for uncolored sound quality and high gain before feedback
- Switchable attenuation pad: enables high-SPL applications up to 144dB
- Switchable bass-cut filter: eliminates rumble or footfall noise
- Universal phantom powering from 9 to 52V: for operating with phantom power supply
- Carefully handcrafted in Vienna, Austria: meticulous attention to detail ensures highest quality

- Electrical working principle: Condenser microphone, self-polarised
- Acoustic working principle: Pressure gradient receiver
- Polar pattern: Cardioid
- Frequency range: 20 to 20,000 Hz ± 2 dB from nominal frequency curve
- Field open loop gain (sensitivity) at 100 Hz: 10 mV/Pa - 40 dBV in re. to 1V/Pa
- Electrical impedance: 200 Ohm
- Recommended load impedance: 1000 Ohm
- Equivalent sound pressure level acc. to IEC 60268-4 (A-weighted): 17 dB-A
- S/N ratio in re. to 1 Pa (A-weighted): 77 dB
- Sound pressure limit: 80 Pa (132 dB) for 1000 Hz
- Operating conditions: - Temperature: -20°C to +60°C
- Relative humidity: 99% (+20°C), 95% (+60°C)
- Supply voltage: 9 to 52 V phantom power acc. to IEC 61938
- Current consumption: 2 mA
- Connector: Type XLR-3 acc. to IEC
- External dimensions: 19 mm ø x 147 mm
- Weight: approx. 115 g, net
- Housing material: Brass
- Housing surface: Mat grey
Brand reference number:C391B
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