Beyerdynamic Classis BM 52 Specifications

Classis BM 52

Boundary Microphone

FEATURES

• Semi-cardioid polar pattern

• RFI-proof due to Scudio™ technology

• ON/OFF, Push-To-Talk and Push-To-Mute function

• Silent membrane key with braille inscription

• High-quality non-glare design

• Linear frequency response with high bandwidth

• LED indicator

• Switchable bass roll-off filter in two stages

• High gain-before-feedback

TECHNICAL SPECIFICATIONS

Transducer type . . . . . . . . . . . . . . . . Condenser (back electret)

Operating principle. . . . . . . . . . . . . . Pressure gradient

Frequency response . . . . . . . . . . . . . 45 - 20,000 Hz

Polar pattern . . . . . . . . . . . . . . . . . . Semi-cardioid

Open circuit voltage . . . . . . . . . . . . . 13.3 mV/Pa = -37.5 dBV

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

Nominal output impedance . . . . . . . ≥ 1 kΩ

Max. SPL at 1 kHz. . . . . . . . . . . . . . . 114.2 dB

Dynamic range. . . . . . . . . . . . . . . . . 84 dB

Signal-to-noise ratio . . . . . . . . . . . . . 63.8 dB dBA, RMS

Noise voltage . . . . . . . . . . . . . . . . . . 8.4 µV [A, RMS]

A-weighted equivalent SPL. . . . . . . . 30.2 dB [A]

Power supply . . . . . . . . . . . . . . . . . . Phantom supply

P48 (+48 VDC ±4 VDC, 6.8 kΩ ±20%)
P24 (+24 VDC ±4 VDC, 1.2 kΩ ±20%)

P12 (+12 VDC ±4 VDC, 680 Ω ±20%)

Current consumption . . . . . . . . . . . . approx. 5.6 mA

Dimensions without connector

(L x W x H) . . . . . . . . . . . . . . . . . . . . 105 x 76 x 25 mm

[4.13" x 2.99" x 0.98"]

Weight without cable. . . . . . . . . . . . 147 g [5.19 oz]

Weight with cable . . . . . . . . . . . . . . 292 g [10.30 oz]

APPLICATIONS

The Classis BM 52 is a very versatile condenser boundary
microphone with many different useful functions.
Depending on the application, you can choose between the
operating modes ON/OFF, Push-To-Talk (PTT) and Push-To-Mute
(PTM). In order to suppress low frequency noise, the frequency
response can be tailored for use with a two-stage bass roll off filter.
The Classis BM 52 is operated with a silent membrane key with
braille inscription. An LED indicates the ready-to-speak status.
The robust housing with a high-quality design is covered with a
very exclusive, dust repellent fabric. Due to its matt, non-glare
surface, the Classis BM 52 can discretely be integrated into each
installation.
It has all possibilities of an intelligent desktop microphone unit. It
can be used anywhere, where little space is available, but a high
functionality is required. It is ideal for round table discussions,
tele/video conferences or distance learning.
The increase of the sound pressure at a boundary results in a higher
gain, signal-to-noise ratio and comb filter effects cannot occur.
The Classis BM 52 RC is available with a remote control. The
microphone can be activated by an external button (operator). The
built-in membrane key can be turned off. An external device (e.g.
video camera) can be controlled with a MOSFET output.
The Classis BM 52 is available in matt black.

VERSIONS

Classis BM 52 black, integrated pre-amp,

3 m cable with 3-pin male

XLR connector . . . . . . . . . Order # 729.442

Classis BM 52 RC black, integrated pre-amp,

3 m cable with 5-pin male

XLR connector . . . . . . . . . Order # 729.450

1 of 3

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 / Classis BM52 (07.16)

Classis BM 52

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 curve ± 2.5 dB Classis BM 52 RC 0 dB = 13.3 mV/Pa

orizontal, 60° Elevation

H

WIRING DIAGRAMS

Classis BM 52

Vertical

2 of 3

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 / Classis BM52 (07.16)

vertical

Classis BM 52 RC

rt = red / rouge
bl = blue / bleu
sw = black / noir
ws = white / blanc
br = brown / brun

Classis BM 52

ARCHITECT’S AND ENGINEER’S SPECIFICATIONS

Classis BM 52

The microphone shall be a fixed-charge condenser designed for use
in table or panel-mount boundary applications. It shall have a
frequency response of 45 Hz to 20,000 Hz and an omnidirectional
polar pattern. It shall have a built-in phantom power module and
shall operate from an external 12V to 52V DC phantom power
source (P12, P24, P48). A red LED shall show the status of the
microphone. The microphone features a touch- sensitive user
switch. A switch shall set microphone button between toggle
ON/OFF (with audio muted at power up), push to talk and push to
mute mode. A switch shall set a low cut filter between linear, 80 Hz
and 180 Hz.
The filter in the microphone grille shall eliminate wind and pop
noise. The RFI shield technology shall eliminate radio frequency
interference of wireless communication devices. It shall be capable
of handling sound input levels up to 114.2 dB with a dynamic
range of 84 dB. Nominal open circuit output voltage shall be

13.3 mV/Pa at 1 kHz. Output shall be low impedance balanced
(<200 ohms).
The microphone shall have a maximum size of 105 x 76 x 25 mm
(4.13" x 2.99" x 0.98"). Weight without cable shall be 147 grams
(5.19 oz). The microphone shall provide an unobtrusive full metal
housing for discreet positioning. The steel mesh grille shall be
covered by a fabric. Finish shall be non-glare mat black [white].
Rubber pads shall be mounted for reduction of mechanical noise
transfer from the mounting panel. The microphone shall have a
3 metre cable, with 3-pin male XLR connector.
beyerdynamic type Classis BM 52 is specified.

Classis BM 52 RC

The microphone shall be a fixed-charge condenser designed for use
in table or panel-mount boundary applications. It shall have a
frequency response of 45 Hz to 20,000 Hz and an omnidirectional
polar pattern. It shall have a built-in phantom power module and
shall operate from an external 12V to 52V DC phantom power
source (P12, P24, P48). A red LED shall show the status of the
microphone. The microphone features a touch-sensitive user
switch. A switch shall set microphone button between toggle
ON/OFF (with audio muted at power up), push to talk and push to
mute mode. A switch shall set a low cut filter between linear, 80 Hz
and 180 Hz.
The filter in the microphone grille shall eliminate wind and pop
noise. The RFI shield technology shall eliminate radio frequency
interference of wireless communication devices. It shall be capable
of handling sound input levels up to 114.2 dB with a dynamic
range of 84 dB. Nominal open circuit output voltage shall be

13.3 mV/Pa at 1 kHz. Output shall be low impedance balanced
(<200 ohms).
The microphone shall have a maximum size of 105 x 76 x 25 mm
(4.13" x 2.99" x 0.98"). Weight without cable shall be 147 grams
(5.19 oz). The microphone shall provide an unobtrusive full metal
housing for discreet positioning. The steel mesh grille shall be
covered by a fabric. Finish shall be non-glare mat black [white].
Rubber pads shall be mounted for reduction of mechanical noise
transfer from the mounting panel. The microphone shall have a
3 metre cable, with 3-pin male XLR connector.
The microphone shall be able to be controlled remotely by an
external button. The built-in membrane key shall be able to turn
off. The remote control of an external device (e.g. video camera)
shall be possible with a MOSFET output.
beyerdynamic type Classis BM 52 RC is specified.

3 of 3

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 / Classis BM52 (07.16)