Beyerdynamic BM 33 W, BM32-B, BM32-SE, BM32-W, BM33-B Specifications

VERSIONS

Classis BM 32 B Half-cardioid, black . . . . . . Order # 489.395

Classis BM 32 W white . . . . . . . . . . . . . . . . . Order # 489.409

Classis BM 32 SE silver metallic effect,

microphone basket made of
acuraLine

®

Topmesh
double-layer fine-meshed

wire weave. . . . . . . . . . . . . Order # 489.387

Classis BM 32 E Half-cardioid, black,

without pre-amp,
in conjunction with

MCS 563 L . . . . . . . . . . . . . Order # 721.913

Classis BM 33 B Half-spherical, black . . . . . . Order # 489.425

Classis BM 33 W white . . . . . . . . . . . . . . . . . Order # 489.433

Classis BM 33 SE silver metallic effect,

microphone basket made of
acuraLine

®

Topmesh
double-layer fine-meshed

wire weave. . . . . . . . . . . . . Order # 489.417

Classis BM 34 B Half-cardioid, black,

bass roll-off filter . . . . . . . . Order # 489.360

Classis BM 34 W white . . . . . . . . . . . . . . . . . Order # 489.379

Classis BM 34 SE silver metallic effect,

microphone basket made of
acuraLine

®

Topmesh
double-layer fine-meshed

wire weave. . . . . . . . . . . . . Order # 489.352

APPLICATIONS

The Classis BM 32 / 33 / 34 condenser boundary microphones have
been designed for flush mounting into tabletops or ceilings. The
microphones have been designed for applications such as tele/video
conferencing, recording or amplification of round table discussions
and wherever the microphone needs to be as unobtrusive as
possible.
The Classis BM 32 has a half-cardioid polar pattern, which increases
the gain-before-feedback and decreases the amount of diffuse
ambience. The Classis BM 34 corresponds to the Classis BM 32, but
is provided with a bass roll-off filter. The Classis BM 33 has a half­spherical polar pattern making it ideal for large rooms.
The high sensitivity guarantees a constant output level even from
long distance sources.
Elastic bearing rings achieve mechanical isolation from the mounting
surface and therefore offer effective sound isolation of the micro­phone.

FEATURES

• Classis BM 32/34 with half-cardioid polar pattern

• Classis BM 33 with half-spherical polar pattern

• Flat, wide range frequency response

• High-quality reproduction of speech

• Unobtrusive design

• Ceiling or tabletop mounting

• Fast and easy installation

SUPPLIED ACCESSORY

• Elastic bearing rings

INSTALLATION

• Mounting hole with elastic bearing rings: Ø 24 mm (15/16")

• Mounting hole without elastic bearing rings: Ø 20 mm (13/16")

• Max. table /ceiling thickness: 57 mm (2.25")

beyerdynamic GmbH & Co. KG
Theresienstr. 8 | 74072 Heilbronn – Germany
Tel. [phone] / 617 - 0 | Fax [phone] / 617 - 204
[e-mail] | www.beyerdynamic.com

For further distributors worldwide, please go to www.beyerdynamic.com
Non-contractual illustrations. Contents subject to change without notice. E2 / BM 32/33/34 (11.10)

Classis BM 32 / 33 / 34

Boundary Microphones

1 of 4

Classis BM 32 B Classis BM 34 SEClassis BM 33 B

Classis BM 32 / 33 / 34

beyerdynamic GmbH & Co. KG
Theresienstr. 8 | 74072 Heilbronn – Germany
Tel. [phone] / 617 - 0 | Fax [phone] / 617 - 204
[e-mail] | www.beyerdynamic.com

For further distributors worldwide, please go to www.beyerdynamic.com
Non-contractual illustrations. Contents subject to change without notice. E2 / BM 32/33/34 (11.10)

2 of 4

TECHNICAL SPECIFICATIONS

Classis BM 32 Classis BM 33 Classis BM 34

Transducer type . . . . . . . . . . . . . . . . . . . . . . . . . . Condenser. . . . . . . . . . . . . . . . . Condenser . . . . . . . . . . . . . . . . . Condenser

Frequency response . . . . . . . . . . . . . . . . . . . . . . . 50 - 18,000 Hz . . . . . . . . . . . . . 50 - 20,000 Hz . . . . . . . . . . . . . 150 - 18,000 Hz

Polar pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . Half-cardioid . . . . . . . . . . . . . . . Half-spherical. . . . . . . . . . . . . . . Half-cardioid

Open circuit voltage

at 1 kHz (0 dB = 1 V/Pa) . . . . . . . . . . . . . . . . . . . 19 mV/Pa = -34.4 dBV . . . . . . . 15 mV/Pa = -36.5 dBV . . . . . . . 19 mV/Pa = -35 dBV

Nominal impedance. . . . . . . . . . . . . . . . . . . . . . . < 200 Ω. . . . . . . . . . . . . . . . . . . < 200 Ω. . . . . . . . . . . . . . . . . . . 200 Ω

Load impedance . . . . . . . . . . . . . . . . . . . . . . . . . ≥ 1 kΩ . . . . . . . . . . . . . . . . . . . . ≥ 1 kΩ . . . . . . . . . . . . . . . . . . . . ≥ 1 kΩ

S/N ratio rel. to 1 Pa . . . . . . . . . . . . . . . . . . . . . . 69 dB [A] . . . . . . . . . . . . . . . . . . 68 dB [A] . . . . . . . . . . . . . . . . . . 60 dB

Noise voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0 µV [A] . . . . . . . . . . . . . . . . . 6.0 µV [A] . . . . . . . . . . . . . . . . .

Max. sound pressure level . . . . . . . . . . . . . . . . . . 107 dB [SPL @ 1% THD] . . . . . . 107 dB [SPL @ 1% THD] . . . . . .

Equivalent SPL . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 dB [A]. . . . . . . . . . . . . . . . . . 26 dB [A] . . . . . . . . . . . . . . . . . . 26 dB

Phantom supply. . . . . . . . . . . . . . . . . . . . . . . . . . 8 - 52 V . . . . . . . . . . . . . . . . . . . 8 - 52 V . . . . . . . . . . . . . . . . . . . 8 - 52 V

Current consumption . . . . . . . . . . . . . . . . . . . . . 2.0 mA . . . . . . . . . . . . . . . . . . . 2.0 mA . . . . . . . . . . . . . . . . . . . 3.4 mA

Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-pin XLR. . . . . . . . . . . . . . . . . . 3-pin XLR . . . . . . . . . . . . . . . . . . 3-pin XLR

Weight (with nut and bearing rings) . . . . . . . . . . approx. 85 g [0.19 lbs] . . . . . . . . approx. 85 g [0.19 lbs]. . . . . . . . approx. 85 g [0.19 lbs]

WIRING DIAGRAMS

Positive pressure produces positive voltage on pin 2.

DIMENSIONS

In millimetres (inches in brackets)

Classis BM 32/33/34 Classis BM 32

Classis BM 32 E Classis BM 33