Beyerdynamic Classis BM 32, Classis BM 34, Classis BM 33 Features & 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, MCS 553 L,

MCS-D 3643 . . . . . . . . . . . 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.
All microphones feature the innovative Scudio™ technology,
making the microphones absolutely insensitive to wireless
communication devices such as mobile phones.
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

• RFI-proof due to Scudio™ technology

• 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. E5 / BM 32/33/34 (08.12)

Classis BM 32 / 33 / 34

Boundary Microphones

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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. E5 / BM 32/33/34 (08.12)

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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

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. E5 / BM 32/33/34 (08.12)

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FREQUENCY RESPONSE & POLAR PATTERN

This frequency response curve (measuring tolerance ± 2.5 dB) and polar pattern correspond to a typical production sample for this microphone.

Frequency response ± 2.5 dB 0 dB = 19 mV/Pa Classis BM 32

Frequency response ± 2.5 dB 0 dB = 19 mV/Pa Classis BM 34

Classis BM 32/34

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. E5 / BM 32/33/34 (08.12)

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FREQUENCY RESPONSE & POLAR PATTERN

This frequency response curve (measuring tolerance ± 2.5 dB) and polar pattern correspond to a typical production sample for this microphone.

Frequency response ± 2.5 dB 0 dB = 15 mV/Pa Classis BM 33

Classis BM 33

ARCHITECT’S SPECIFICATIONS

The cardioid electret condenser boundary microphone shall be a
high-quality installation microphone for tabletops or ceilings. The
microphone shall be provided with an integrated amplifier and
power supply. The SCUDIO®technology shall eliminate inter­ferences of other wireless communication devices. The microphone
shall be powered by phantom power between 8 V and 52 V. The
filter in the microphone grille shall eliminate wind and pop noise.
The fully metal housing shall provide a M20 x 1.5 thread with
fastening nut and black metal microphone grille. The delivery shall
include elastic bearing rings to compensate mechanical noise and
vibration. The frequency response shall be 50 Hz - 18 kHz. The open
circuit voltage shall be 19 mV/Pa. The nominal impedance shall be
200 ohms. The lower part of the housing shall provide a 3-pin male
XLR connector. The total length shall be 76 mm [3"], the shaft
length shall be 67 mm [2.6"], the shaft diameter shall be 20 mm
[0.8"] (M20 x 1.5 thread with fastening nut), the head diameter
shall be 30 mm [1.2"], the length of the head shall be 9 mm [0.4"].
The net weight shall be 0.085 kg [0.2 lbs].

Manufacturer: beyerdynamic
Type: Classis BM 32 B

The cardioid electret condenser boundary microphone shall be a
high-quality installation microphone for tabletops or ceilings. The
microphone shall be provided with an integrated amplifier and
power supply. The SCUDIO®technology shall eliminate inter­ferences of other wireless communication devices. The microphone
shall be powered by phantom power between 8 V and 52 V. The
filter in the microphone grille shall eliminate wind and pop noise.
The fully metal housing shall provide a M20 x 1.5 thread with
fastening nut and a microphone grille with silver metal-look made
of double-layer, fine-meshed acuraLINE®wire mesh. The delivery
shall include elastic bearing rings to compensate mechanical noise
and vibration. The frequency response shall be 50 Hz - 18 kHz. The
open circuit voltage shall be 19 mV/Pa. The nominal impedance
shall be 200 ohms. The lower part of the housing shall provide a
3-pin male XLR connector. The total length shall be 76 mm [3"],
the shaft length shall be 67 mm [2.6"], the shaft diameter shall be
20 mm [0.8"] (M20 x 1.5 thread with fastening nut), the head
diameter shall be 30 mm [1.2"], the length of the head shall be
9 mm [0.4"]. The net weight shall be 0.085 kg [0.2 lbs].

Manufacturer: beyerdynamic
Type: Classis BM 32 SE

The cardioid electret condenser boundary microphone shall be a
high-quality installation microphone for tabletops or ceilings. The
microphone shall be provided with an integrated amplifier and
power supply. The SCUDIO®technology shall eliminate inter­ferences of other wireless communication devices. The microphone
shall be powered by phantom power between 8 V and 52 V. The
filter in the microphone grille shall eliminate wind and pop noise.
The fully metal housing shall provide a M20 x 1.5 thread with
fastening nut and white metal microphone grille. The delivery shall
include elastic bearing rings to compensate mechanical noise and
vibration. The frequency response shall be 50 Hz - 18 kHz. The open

circuit voltage shall be 19 mV/Pa. The nominal impedance shall be
200 ohms. The lower part of the housing shall provide a 3-pin male
XLR connector. The total length shall be 76 mm [3"], the shaft
length shall be 67 mm [2.6"], the shaft diameter shall be 20 mm
[0.8"] (M20 x 1.5 thread with fastening nut), the head diameter
shall be 30 mm [1.2"], the length of the head shall be 9 mm [0.4"].
The net weight shall be 0.085 kg [0.2 lbs].

Manufacturer: beyerdynamic
Type: Classis BM 32 W

The omnidirectional electret condenser boundary microphone shall
be a high-quality installation microphone for tabletops or ceilings.
The microphone shall be provided with an integrated amplifier and
power supply. The SCUDIO®technology shall eliminate inter­ferences of other wireless communication devices. The microphone
shall be powered by phantom power between 8 V and 52 V. The
filter in the microphone grille shall eliminate wind and pop noise.
The fully metal housing shall provide a M20 x 1.5 thread with
fastening nut and black metal microphone grille. The delivery shall
include elastic bearing rings to compensate mechanical noise and
vibration. The frequency response shall be 50 Hz - 18 kHz. The open
circuit voltage shall be 15 mV/Pa. The nominal impedance shall be
200 ohms. The lower part of the housing shall provide a 3-pin male
XLR connector. The total length shall be 76 mm [3"], the shaft
length shall be 67 mm [2.6"], the shaft diameter shall be 20 mm
[0.8"] (M20 x 1.5 thread with fastening nut), the head diameter
shall be 30 mm [1.2"], the length of the head shall be 9 mm [0.4"].
The net weight shall be 0.085 kg [0.2 lbs].

Manufacturer: beyerdynamic
Type: Classis BM 33 B

The omnidirectional electret condenser boundary microphone shall
be a high-quality installation microphone for tabletops or ceilings.
The microphone shall be provided with an integrated amplifier and
power supply. The SCUDIO®technology shall eliminate inter­ferences of other wireless communication devices. The microphone
shall be powered by phantom power between 8 V and 52 V. The
filter in the microphone grille shall eliminate wind and pop noise.
The fully metal housing shall provide a M20 x 1.5 thread with
fastening nut and a microphone grille with silver metal-look made
of double-layer, fine-meshed acuraLINE®wire mesh. The delivery
shall include elastic bearing rings to compensate mechanical noise
and vibration. The frequency response shall be 50 Hz - 18 kHz. The
open circuit voltage shall be 15 mV/Pa. The nominal impedance
shall be 200 ohms. The lower part of the housing shall provide a
3-pin male XLR connector. The total length shall be 76 mm [3"],
the shaft length shall be 67 mm [2.6"], the shaft diameter shall be
20 mm [0.8"] (M20 x 1.5 thread with fastening nut), the head
diameter shall be 30 mm [1.2"], the length of the head shall be
9 mm [0.4"]. The net weight shall be 0.085 kg [0.2 lbs].

Manufacturer: beyerdynamic
Type: Classis BM 33 SE

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. E5 / BM 32/33/34 (08.12)

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ARCHITECT’S SPECIFICATIONS

The omnidirectional electret condenser boundary microphone shall
be a high-quality installation microphone for tabletops or ceilings.
The microphone shall be provided with an integrated amplifier and
power supply. The SCUDIO®technology shall eliminate inter­ferences of other wireless communication devices. The microphone
shall be powered by phantom power between 8 V and 52 V. The
filter in the microphone grille shall eliminate wind and pop noise.
The fully metal housing shall provide a M20 x 1.5 thread with
fastening nut and white metal microphone grille. The delivery shall
include elastic bearing rings to compensate mechanical noise and
vibration. The frequency response shall be 50 Hz - 18 kHz. The open
circuit voltage shall be 15 mV/Pa. The nominal impedance shall be
200 ohms. The lower part of the housing shall provide a 3-pin male
XLR connector. The total length shall be 76 mm [3"], the shaft
length shall be 67 mm [2.6"], the shaft diameter shall be 20 mm
[0.8"] (M20 x 1.5 thread with fastening nut), the head diameter
shall be 30 mm [1.2"], the length of the head shall be 9 mm [0.4"].
The net weight shall be 0.085 kg [0.2 lbs].

Manufacturer: beyerdynamic
Type: Classis BM 33 W

The cardioid electret condenser boundary microphone shall be a
high-quality installation microphone for tabletops or ceilings. The
microphone shall be provided with an integrated amplifier and
power supply with bass roll-off filter. The SCUDIO®technology shall
eliminate inter-ferences of other wireless communication devices.
The microphone shall be powered by phantom power between 8 V
and 52 V. The filter in the microphone grille shall eliminate wind
and pop noise. The fully metal housing shall provide a M20 x 1.5
thread with fastening nut and black metal microphone grille. The
delivery shall include elastic bearing rings to compensate mechanical
noise and vibration. The frequency response shall be 50 Hz - 18 kHz.
The open circuit voltage shall be 19 mV/Pa. The nominal impe­dance shall be 200 ohms. The lower part of the housing shall provide
a 3-pin male XLR connector. The total length shall be 76 mm [3"],
the shaft length shall be 67 mm [2.6"], the shaft diameter shall be
20 mm [0.8"] (M20 x 1.5 thread with fastening nut), the head
diameter shall be 30 mm [1.2"], the length of the head shall be
9 mm [0.4"]. The net weight shall be 0.085 kg [0.2 lbs].

Manufacturer: beyerdynamic
Type: Classis BM 34 B

The cardioid electret condenser boundary microphone shall be a
high-quality installation microphone for tabletops or ceilings. The
microphone shall be provided with an integrated amplifier and
power supply with bass roll-off filter. The SCUDIO®technology shall
eliminate inter-ferences of other wireless communication devices.
The microphone shall be powered by phantom power between 8 V
and 52 V. The filter in the microphone grille shall eliminate wind
and pop noise. The fully metal housing shall provide a M20 x 1.5
thread with fastening nut and a microphone grille with silver metal­look made of double-layer, fine-meshed acuraLINE®wire mesh. The
delivery shall include elastic bearing rings to compensate mechanical
noise and vibration. The frequency response shall be 50 Hz - 18 kHz.
The open circuit voltage shall be 19 mV/Pa. The nominal impe­dance shall be 200 ohms. The lower part of the housing shall provide
a 3-pin male XLR connector. The total length shall be 76 mm [3"],
the shaft length shall be 67 mm [2.6"], the shaft diameter shall be
20 mm [0.8"] (M20 x 1.5 thread with fastening nut), the head
diameter shall be 30 mm [1.2"], the length of the head shall be
9 mm [0.4"]. The net weight shall be 0.085 kg [0.2 lbs].

Manufacturer: beyerdynamic
Type: Classis BM 34 SE

The cardioid electret condenser boundary microphone shall be a
high-quality installation microphone for tabletops or ceilings. The
microphone shall be provided with an integrated amplifier and
power supply with bass roll-off filter. The SCUDIO®technology shall
eliminate interferences of other wireless communication devices.
The microphone shall be powered by phantom power between 8 V
and 52 V. The filter in the microphone grille shall eliminate wind
and pop noise. The fully metal housing shall provide a M20 x 1.5
thread with fastening nut and white metal microphone grille. The
delivery shall include elastic bearing rings to compensate mechanical
noise and vibration. The frequency response shall be 50 Hz - 18 kHz.
The open circuit voltage shall be 19 mV/Pa. The nominal impe­dance shall be 200 ohms. The lower part of the housing shall provide
a 3-pin male XLR connector. The total length shall be 76 mm [3"],
the shaft length shall be 67 mm [2.6"], the shaft diameter shall be
20 mm [0.8"] (M20 x 1.5 thread with fastening nut), the head
diameter shall be 30 mm [1.2"], the length of the head shall be
9 mm [0.4"]. The net weight shall be 0.085 kg [0.2 lbs].

Manufacturer: beyerdynamic
Type: Classis BM 34 W

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. E5 / BM 32/33/34 (08.12)

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