Schoeps BLM 3g Boundary Layer Microphone Capsule

Schoeps BLM 3g Boundary Layer Microphone Capsule

Schoeps BLM 3g Boundary Layer Microphone Capsule

B&H # SCBLM3G MFR # BLM 3G
Schoeps BLM 3g Boundary Layer Microphone Capsule

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Expected availability: 4-6 weeks

Product Highlights

  • Pressure Transducer
  • Hemispheric Directional Polar Pattern
  • Colette Series Capsule
  • Designed for Low Frequencies

This item is noncancelable and nonreturnable

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Schoeps BLM 3g overview

  • 1Description

The matte gray BLM 3g Boundary Layer Microphone Capsule from Schoeps is used to capture audio in critical applications such as TV, film sound, stage dialogue and more. It features a pressure transducer that offers high signal-to-noise ratio and stable performance. The plate of the BLM 3g is only 5mm thick and the transducer is not mounted at its center. The edges of the plate have little effect upon the sound pickup. Off-axis sounds encounter very little frequency discrimination. Sound coloration is low, even for moving sound sources because the frequency response is essentially the same for all angles within the hemispherical pickup pattern.

The capsule itself and the electrostatic pressure transducer is inherently insensitive to wind and vibration. The BLM 3g is comparatively heavy compared to other mics of this kind so it picks up very little solid-borne noise. For example, when footsteps are recorded, most of the sound reaching the microphone will be conducted through the air rather than the floor.

The BLM 3g resembles any other microphone capsule of the Colette series in that it needs a microphone amplifier (e.g. CMC, CMD 2 U or M 222) to form a complete microphone. This allows active accessories such as the low-cut filter (CUT 1 or CUT 2) and the Active Cable (KC) to be added as well.

Placement at an Acoustic Boundary
In practice, the plate in which the small transducer of the BLM 3g is mounted assures reflection of only the high and medium frequencies. To reflect sound at lower frequencies the dimensions of the surface must be correspondingly larger. So the microphone should be placed on a floor, wall or ceiling, or mounted on another surface large enough to reflect the lowest frequencies of interest.
Hemispheric Pattern Independent of Frequency
When pressure transducers are used, the result is a hemispherical directional characteristic that is independent of frequency; thus it is not necessary to aim the microphones and if the angle of sound pickup changes, the sound quality remains essentially the same.
Low Frequency Reproduction
In theory an ideal transducer of this type would have a membrane of infinitesimally small size, and would be mounted flush with an infinitely large, perfectly sound-reflecting surface. In practice, the plate in which the small transducer of the BLM 3g is mounted assures reflection of only the high and medium frequencies. To reflect sound at lower frequencies (greater wavelengths), the dimensions of the surface must be correspondingly larger. So the microphone should be placed on a floor, wall or ceiling, or mounted on another surface large enough to reflect the lowest frequencies of interest.
Suited for Orchestral Recording
Typical applications include pickup of stage dialogue, or in orchestra pits, as an ambience microphone and for special public address applications. Since the microphone may well be used on the floor, the likelihood of damage from its being stepped on has been reduced by careful design and construction. As a rule, the capsule will not be harmed by normal footwear.
In the Box
Schoeps BLM 3g Boundary Layer Microphone Capsule
  • Limited 2-Year Warranty
  • Table of Contents
    • 1Description

    Schoeps BLM 3g specs

    Analog Performance
    Polar Pattern Omnidirectional
    Frequency Range 20 Hz to 20 kHz
    Signal to Noise Ratio 82 dB A-Weighted
    Equivalent Noise Level 12 dB A-Weighted
    23 dB CCIR
    Maximum SPL 128 dB SPL
    THD 0.5%
    Sensitivity 19 mV/Pa
    General
    Output Connectors 1 x 3-Pin XLR
    Operating Current Consumption 8 mA
    Operating Voltage 12 V
    48 V
    Length 7.87" / 200 mm
    Weight 20.11 oz / 570 g

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