BEYERDYNAMIC Classis GM 303S, Classis GM 304S, Classis GM 305 Classis GM 302 - 306.pdf

FEATURES

• RFI-proof due to Scudio™ technology

• High sensitivity

• High gain before feedback

• Unobtrusive due to small dimensions

• Non-glare surface

• Phantom power 8 - 52 volts

APPLICATIONS

The gooseneck microphones of the Classis series integrate cardioid
electret microphones inside the very small microphone head. They
can be used for all kinds of applications where a high-quality, but
also discrete microphone is demanded.
Due to the cardioid polar pattern this microphone has a high gain
before feedback and provides highest intelligibility of speech.
Therefore, the microphones are ideal for the use with lecterns, sound
reinforcement applications, conferencing, high quality talkback and
paging systems.
All microphones feature the innovative Scudio™ technology,
making the microphones absolutely insensitive to wireless
communication devices such as mobile phones.
The microphone is mounted on a 6 mm thick gooseneck and due to
its mat black, non-glare surface almost invisible.
The microphones can be powered with any phantom power source
supplying 8 to 52 volts.

Classis GM 302 - 306

Gooseneck Microphones

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. E9 / GM 302 - 306 (08.13)

1 of 7

OPTIONAL ACCESSORIES

ZSA 305 Mounting adapter for the use of

Classis GM 305 T with ZSH 20. . Order # 723.037

ZSH 23 FT Base plate with 3-pin

XLR-socket and cable . . . . . . . Order # 464.902

ZSH 20 Shock-mounted holder for

desktop installation . . . . . . . . . Order # 454.559

SUPPLIED ACCESSORY

WS 302 B Wind shield for

Classis GM 302 - 3x5 (S),

black . . . . . . . . . . . . . . . . . . . . Order # 722.782

VERSIONS

Classis GM 302 XLR plug, 200 mm [8"] . . . . . . . . Order # 489.557

Classis GM 303 XLR plug, 300 mm [12"] . . . . . . . Order # 722.383

Classis GM 303 S same as above, but with switch. . Order # 489.549

Classis GM 304 XLR plug, 400 mm [16"] . . . . . . . Order # 722.391

Classis GM 304 S same as above, but with switch. . Order # 489.301

Classis GM 305 XLR plug, 500 mm [20"] . . . . . . . Order # 722.405

Classis GM 305 S same as above, but with switch. . Order # 722.413

Classis GM 306 XLR plug, 600 mm [24"] . . . . . . . Order # 724.246

Classis GM 305 T 5/8"internal thread / adapter to 3/8"

and M18x0.75 external thread,
length 500 mm 500 mm [20"],
connecting cable 2.5 m [8.2 ft]
with 4-pin female mini XLR
connector, incl. CVE 305.18
pre-amp, ZSH 305 small base plate,

wind shield. . . . . . . . . . . . . . . . . . Order # 722.421

GM 303

GM 305 S

Classis GM 302 - 306

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. E9 / GM 302 - 306 (08.13)

2 of 7

TECHNICAL SPECIFICATIONS

Transducer type. . . . . . . . . . . . . . . . . . Electret condenser

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

Polar pattern. . . . . . . . . . . . . . . . . . . . Cardioid

Frequency response . . . . . . . . . . . . . . 50 - 19,000 Hz

Open circuit voltage . . . . . . . . . . . . . . 17 mV/Pa

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

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

Signal to noise ratio / noise voltage. . . 69 dB [A] / 6.0 µV [A]

Max. SPL. . . . . . . . . . . . . . . . . . . . . . . 107 dB [SPL @ 1% THD]

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

Wiring GM 30x/30x S . . . . . . . . . . . . . balanced with 3-pin

XLR-plug

Wiring GM 305 T . . . . . . . . . . . . . . . . balanced, 2.5 m [8.2 ft.]

long connecting cable with
4-pin female mini XLR
connector for CVE 305.18
pre-amp with 3-pin XLR

connector

Supply voltage GM 30x. . . . . . . . . . . . Phantom power 8 - 52 V

Supply voltage GM 30x S . . . . . . . . . . Phantom power 8 - 52 V

Current consumption GM 30x . . . . . . 2 mA

Current consumption GM 30x S . . . . . 6 mA

Dimensions

Length . . . . . . . . . . . . . . . . . . . . . . . . depending on the version

Head diameter . . . . . . . . . . . . . . . . . . 13.6 mm [0.5"]

Gooseneck diameter . . . . . . . . . . . . . . 6 mm [0.2"]

Shaft diameter . . . . . . . . . . . . . . . . . . 20 mm [0.8"]

Weight . . . . . . . . . . . . . . . . . . . . . . . . depending on the version

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.

WIRING DIAGRAMS

Frequency response curve ± 2.5 dB 0 dB = 17 mV/Pa Classis GM 302 - 306

^

Classis GM 305 T CVE 305.18

br = braun / brown / brun
rt = rot / red / rouge
ws = weiß / white / blanc
Sch = Schirm / shield / écran

Classis GM 302 - 306 Classis GM 303 S - 305 S

rt = rot / red / rouge
ws = weiß / white / blanc
Sch = Schirm / shield / écran

Classis GM 302 - 306

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. E9 / GM 302 - 306 (08.13)

3 of 7

DIMENSIONS

visible area

212 mm [8.3"]

200 mm [7.8"]

GM 302

built-in area

built-in area

visible area

312 mm [12.3"]

300 mm [11.8"]

GM 303

built-in area

visible area

412 mm [16.2"]

400 mm [15.7"]

GM 304

built-in area

visible area

512 mm [20.2"]

500 mm [19.7"]

GM 305

Classis GM 302 - 306

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. E9 / GM 302 - 306 (08.13)

4 of 7

DIMENSIONS

built-in area

327 mm [12.9"]

315 mm [12.4"]

GM 303 S

427 mm [16.8"]

415 mm [16.3"]

GM 304 S

visible area

built-in area

visible area

612 mm [24.1]

600 mm [23.6]

GM 306

built-in area

visible area

527 mm [20.7"]

515 mm [20.3"]

GM 305 S

built-in area

visible area

Classis GM 302 - 306

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. E9 / GM 302 - 306 (08.13)

5 of 7

DIMENSIONS

GM 305 T

table top

screw-in foot

optional ZSA 305 mounting adapter

M 18x0.75 external thread
5/8" internal thread, 27 inch
Threaded adapter 5/8" to 3/8"

ZSH 305 screw-in foot

90° sinking for M4 countersunk screw

Classis GM 302 - 306

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. E9 / GM 302 - 306 (08.13)

6 of 7

ARCHITECT’S SPECIFICATIONS

The cardioid electret condenser microphone shall be used as a high­quality conference, paging and PA microphone. The phantom
power shall be between 8 and 52 V. The filter in the microphone
grille shall eliminate wind and pop noise. The SCUDIO®technology
shall eliminate interferences of other wireless communication
devices. The fully metal housing shall be non-glare and black. The
gooseneck shall provide a thickness of 6 mm [0.2"] and a total
length of 212 mm [8.3"]. The microphone diameter shall be

13.6 mm [0.5"]. A pre-amplifier shall be integrated in the base and
provided with a balanced signal output. The frequency response
shall be 50 - 19,000 Hz. The open circuit voltage shall be 17 mV/Pa.
The nominal impedance shall be 200 ohms. The microphone shall
be provided with a 3-pin male XLR connector. The net weight shall
be 0.121 kg [0.23 lbs].

Manufacturer: beyerdynamic
Type: Classis GM 302

The cardioid electret condenser microphone shall be used as a high­quality conference, paging and PA microphone. The phantom
power shall be between 8 and 52 V. The filter in the microphone
grille shall eliminate wind and pop noise. The SCUDIO®technology
shall eliminate interferences of other wireless communication
devices. The fully metal housing shall be non-glare and black. The
gooseneck shall provide a thickness of 6 mm [0.2"] and a total
length of 312 mm [12.3"]. The microphone diameter shall be

13.6 mm [0.5"]. A pre-amplifier shall be integrated in the base and
provided with a balanced signal output. The frequency response
shall be 50 - 19,000 Hz. The open circuit voltage shall be 17 mV/Pa.
The nominal impedance shall be 200 ohms. The microphone shall
be provided with a 3-pin male XLR connector. The net weight shall
be 0.132 kg [0.23 lbs].

Manufacturer: beyerdynamic
Type: Classis GM 303

The cardioid electret condenser microphone shall be used as a high­quality conference, paging and PA microphone. The phantom
power shall be between 8 and 52 V. The filter in the microphone
grille shall eliminate wind and pop noise. The SCUDIO®technology
shall eliminate interferences of other wireless communication
devices. The microphone shall feature a radial slide switch with two
defined snap-in points and one green status LED. The fully metal
housing shall be non-glare and black. The gooseneck shall provide
a thickness of 6 mm [0.2"] and a total length of 327 mm [12.9"].
The microphone diameter shall be 13.6 mm [0.5"]. A pre-amplifier
shall be integrated in the base and provided with a balanced signal
output. The frequency response shall be 50 - 19,000 Hz. The open
circuit voltage shall be 17 mV/Pa. The nominal impedance shall be
200 ohms. The microphone shall be provided with a 3-pin male XLR
connector. The net weight shall be 0.150 kg [0.330 lbs].

Manufacturer: beyerdynamic
Type: Classis GM 303 S

The cardioid electret condenser microphone shall be used as a high­quality conference, paging and PA microphone. The phantom
power shall be between 8 and 52 V. The filter in the microphone
grille shall eliminate wind and pop noise. The SCUDIO®technology
shall eliminate interferences of other wireless communication
devices. The fully metal housing shall be non-glare and black. The
microphone shall feature 2 x 6 mm [2 x 0.2"] goosenecks with a
rigid tube in between and a total length of 412 mm [16.2" ]. The
microphone diameter shall be 13.6 mm [0.5"]. A pre-amplifier shall
be integrated in the base and provided with a balanced signal out­put. The frequency response shall be 50 - 19,000 Hz. The open
circuit voltage shall be 17 mV/Pa. The nominal impedance shall be
200 ohms. The microphone shall be provided with a 3-pin male XLR
connector. The net weight shall be 0.145 kg [0.32 lbs].

Manufacturer: beyerdynamic
Type: Classis GM 304

The cardioid electret condenser microphone shall be used as a high­quality conference, paging and PA microphone. The phantom
power shall be between 8 and 52 V. The filter in the microphone
grille shall eliminate wind and pop noise. The microphone shall
feature a radial slide switch with two defined snap-in points and
one green status LED. The SCUDIO®technology shall eliminate
interferences of other wireless communication devices. The fully
metal housing shall be non-glare and black. The microphone shall
feature 2 x 6 mm [0.2"] goosenecks with a rigid tube in between
and a total length of 427 mm [16.8" ]. The microphone diameter
shall be 13.6 mm [0.5"]. A pre-amplifier shall be integrated in the
base and provided with a balanced signal output. The frequency
response shall be 50 - 19,000 Hz. The open circuit voltage shall be
17 mV/Pa. The nominal impedance shall be 200 ohms. The micro­phone shall be provided with a 3-pin male XLR connector. The net
weight shall be 0.163 kg [0.359 lbs].

Manufacturer: beyerdynamic
Type: Classis GM 304 S

Classis GM 302 - 306

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. E9 / GM 302 - 306 (08.13)

7 of 7

ARCHITECT’S SPECIFICATIONS

The cardioid electret condenser microphone shall be used as a high­quality conference, paging and PA microphone. The phantom
power shall be between 8 and 52 V. The filter in the microphone
grille shall eliminate wind and pop noise. The SCUDIO®technology
shall eliminate interferences of other wireless communication
devices. The fully metal housing shall be non-glare and black. The
microphone shall feature 2 x 6 mm [2 x 0.2"] goosenecks with a
rigid tube in between and a total length of 512 mm [20.2"]. The
microphone diameter shall be 13.6 mm [0.5"]. A pre-amplifier shall
be integrated in the base and provided with a balanced signal out­put. The frequency response shall be 50 - 19,000 Hz. The open
circuit voltage shall be 17 mV/Pa. The nominal impedance shall be
200 ohms. The microphone shall be provided with a 3-pin male XLR
connector. The net weight shall be 0.156 kg [0.34 lbs].

Manufacturer: beyerdynamic
Type: Classis GM 305

The cardioid electret condenser microphone shall be used as a high­quality conference, paging and PA microphone. The phantom
power shall be between 8 and 52 V. The filter in the microphone
grille shall eliminate wind and pop noise. The SCUDIO®technology
shall eliminate interferences of other wireless communication
devices. The fully metal housing shall be non-glare and black. The
microphone shall feature 2 x 6 mm [2 x 0.2"] goosenecks with a
rigid tube in between and a total length of 612 mm [24.1"]. The
microphone diameter shall be 13.6 mm [0.5"]. A pre-amplifier shall
be integrated in the base and provided with a balanced signal out­put. The frequency response shall be 50 - 19,000 Hz. The open
circuit voltage shall be 17 mV/Pa. The nominal impedance shall be
200 ohms. The microphone shall be provided with a 3-pin male XLR
connector. The net weight shall be 0.167 kg [0.37 lbs].

Manufacturer: beyerdynamic
Type: Classis GM 306

The cardioid electret condenser microphone shall be used as a high­quality conference, paging and PA microphone. The phantom
power shall be between 8 and 52 V. The filter in the microphone
grille shall eliminate wind and pop noise. The microphone shall
feature a radial slide switch with two defined snap-in points and
one green status LED. The SCUDIO®technology shall eliminate
interferences of other wireless communication devices. The fully
metal housing shall be non-glare and black. The microphone shall
feature 2 x 6 mm [2 x 0.2"] goosenecks with a rigid tube in
between and a total length of 527 mm [20.7"]. The microphone
diameter shall be 13.6 mm [0.5"]. A pre-amplifier shall be
integrated in the base and provided with a balanced signal output.
The frequency response shall be 50 - 19,000 Hz. The open circuit
voltage shall be 17 mV/Pa. The nominal impedance shall be
200 ohms. The microphone shall be provided with a 3-pin male XLR
connector. The net weight shall be 0.174 kg [0.384 lbs].

Manufacturer: beyerdynamic
Type: Classis GM 305 S

The cardioid electret condenser microphone shall be used as a high­quality conference, paging and PA microphone. The phantom
power shall be between 8 and 52 V. The filter in the microphone
grille shall eliminate wind and pop noise. The SCUDIO®technology
shall eliminate interferences of other wireless communication
devices. The fully metal housing shall be non-glare and black. The
microphone shall feature 2 x 6 mm [2 x 0.2"]goosenecks with a
rigid tube in between and a total length of 462 mm [18.2"]
without mounting adapter. The microphone diameter shall be

13.6 mm [0.5"]. The connected CVE 305.18 pre-amp shall be
provided with a 4-pin male mini XLR and 3-pin male XLR connector
with balanced signal output. The frequency response shall be
50 - 19,000 Hz. The open circuit voltage shall be 17 mV/Pa. The
nominal impedance shall be 200 ohms. The connecting cable shall
be 2.5 m [8.2 ft] long with a 4-pin female mini XLR connector. The
5/8" internal thread shall provide an adapter to 3/8". The
M18x0.75 external thread shall be provided with a screw-type
thread cover with cable outlet when mounting via the internal
thread. The microphone shall be supplied with the ZSH 305 base
plate for mounting on a table via the M18x0.75 external thread.
An optional ZSA 305 mounting adapter shall be available for
installation with the ZSH 20 holder (optional) decoupled from
mechanical noise and vibration. The net weight shall be 0.147 kg
[0.324 lbs].

Manufacturer: beyerdynamic
Type: Classis GM 305 T