008483 Neumann BCM 104 Studio Condenser Microphone, Sennheiser

Description:

008483 Neumann BCM 104 Studio Condenser Microphone, Sennheiser

The Broadcast Line microphones are designed to meet the exacting requirements of professional broadcasters. The large diaphragm condenser capsule used in the BCM 104 provides cardioid directivity that is ideal for sound reproduction.
A flat frequency response of the microphone, up to 3 kHz, has a smooth rise in the HF region. An internal proximity effect compensation filter switch is provided. Another switch provides a decrease in sensitivity by 14 dB.
Thanks to these features, the BCM 104 can be widely used in announcer work, at "round tables", in talk shows, when recording music radio shows.

Mechanical properties.
The microphone protection is threaded for quick removal for cleaning. Optional grilles are available with different colored marking rings so that each speaker can use their own grill for hygiene purposes.
Directly in front of the capsule, mounted on the frame-holder, there is a fine-section wire mesh that serves as a built-in windscreen. To protect against structure-borne noise, the BCM 104 has an elastic mount that is compatible with standard microphone "pantographs" used in broadcast studios.
Acoustic properties.
The microphone uses a large diaphragm K 104 capsule that provides a flat frequency response up to 3 kHz. At higher frequencies, there is a rise ("presence") of no more than 2 dB. Since the above parameters are provided without the use of resonance, the microphone exhibits excellent transient characteristics and transmits the edges of music and speech signals without any coloration.

Built-in pop filter.
The microphone's built-in pop filter not only prevents "explosive" noises when recording vocals, but also effectively protects the membrane from the accumulation of food particles and moisture. For cleaning, the pop filter can be removed without the use of tools.

Electrical properties.
Instead of a transformer providing electrical isolation between the output stage and the supply voltage, the BCM 104 uses an electronic circuit that, like a transformer, provides effective common-mode rejection. Conducted noise in balanced lines is suppressed as usual. With a very low self-noise level of 7 dB (A) and high overload resistance (maximum sound pressure level up to 138 dB SPL), the BCM 104 provides a dynamic range of 131 dB (A-weighted).

Filter and attenuator.
The BCM 104 amplifier operates in linear mode with frequencies up to 20 Hz. An active filter effectively suppresses signal components below this frequency. To compensate for the effect of proximity, the microphone has a built-in high-pass filter with a switch. This filter suppresses frequencies below 100 Hz with a slope of 12 dB / octave. To work with sound paths designed for dynamic microphones, the BCM 104 has a –14 dB attenuator, also with a switch. Both switches are located inside the microphone housing, since the setting is usually done once, when switching the sound system.

Installing a microphone.
The preferred mode of operation is to mount the BCM 104 on a standard studio stand or "pantograph" in an on-air studio. The scope of delivery includes an adapter for threaded fasteners of various diameters. To protect against structure-borne noise, both the capsule inside the housing and the microphone itself have mounts with elastic mounts. Accessories include an SG 5 articulated clamp that allows the BCM 104 to rotate ± 90 °.

Designed specifically for radio announcers.
New condenser capsule optimized for speech.
Integrated pop filter and elasticated surround.

Equivalent noise level (A-weighted): 87 dB.
Nominal impedance: 50 Ohm.
Minimum load impedance: 1000 Ohm.
Microphone connector: XLR.
Frequency range: 20 Hz - 20,000 Hz.
Microphone sensitivity: 24 mV / Pa.
Converter principle: capacitor.
Maximum sound pressure level: 152 dB.
Microphone supply voltage: 48 V.
Microphone current consumption: 3.2 mA.
Dimensions: 85 x 64 x 64 mm.
Weight: 500 g.