beyerdynamic CLASSIS GM 303 – 306 Flexible Cardioid Gooseneck Microphone Instructions

: June 5, 2024
: beyerdynamic

Table of Contents

PRODUCT INFORMATION
Applications
Installation and Connection
Maintenance
Service
Versions
Supplied Accessories
Optional Accessories
Technical Specifications
Frequency Response Curve
Polar Pattern
Wiring Diagrams
Dimensions
References
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beyerdynamic CLASSIS GM 303 – 306 Flexible Cardioid Gooseneck Microphone Instructions

PRODUCT INFORMATION

Classis GM 303 – 306 / Classis 313 – 315

Thank you for selecting one of the GM 303 – 306 / GM 313 – 315 gooseneck microphones of the Classis series from beyerdynamic. Please take some time to read carefully through this information before using the product.

Gooseneck – Caution

In order to avoid overstretching and premature wear and tear never bend the gooseneck more than 90°. Bending and turning of the gooseneck at the same time cause premature wear and tear or damage of the gooseneck and should be avoided.

Applications

This gooseneck microphone features a cardioid polar pattern, high gain before feedback and excellent intelligibility of speech. It is suitable for use on 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.

Installation and Connection

For example an XLR flange socket is installed into the tabletop and connected to the amplifier input (pin 1: ground, pin 2: NF+, pin 3: NF-). As an alternative there are installation and shockmounted holders available (refer to “Optional Accessories”).

The microphone is connected and ready for operation.
The microphones with pre-amplifier need a phantom supply of 8 – 52 V for operation.

Classis GM 313 – 315 versions with illuminated ring

In order to avoid interference, we recommend that the audio and the supply for the illuminated ring are individually screened. Connection: pin 4/LED-: cathode, pin 5/LED+: anode.

Classis GM 313 SP – 315 SP versions with illuminated ring and programmable button

With the SP variants you can select via the programmable button between the operating modes ON/OFF, Push-To-Talk and Push-To-Mute. The microphone button can also be disabled (Button Mode – Disabled (ON)). The frequency response can be set with a separate switch in two stages: Linear or with low-cut filter to suppress low-frequency interference. The illuminated ring indicating the microphone status can be deactivated.

Use a small Philips screwdriver to open the cover for the rotary switch as indicated by the arrow. The rotary switch can be seen.

In order to select the requested button function with the rotary selector switch and for setting the frequency response, use a small Phillips screwdriver.

Use a small Philips screwdriver to close the cover for the rotary switch as indicated by the arrow. The rotary switch is covered.

For assignments of the rotary selector switch, please refer to the following table.

Position	Button Mode	HP Filter	LED Ring
0	PTT	ON	ON
1	PTM	ON	ON
2	Disabled (ON)	ON	ON
3	ON/OFF	ON	ON
4	PTT	OFF	ON
5	PTM	OFF	ON
6	Disabled (ON)	OFF	ON
7	ON/OFF	OFF	ON
8	PTT	ON	OFF
9	PTM	ON	OFF
A	Disabled (ON)	ON	OFF
B	ON/OFF	ON	OFF
C	PTT	OFF	OFF
D	PTM	OFF	OFF
E	Disabled (ON))	OFF	OFF
F	ON/OFF	OFF	OFF

Classis GM 315 RC version with illuminated ring, programmable button and remote control

In addition to the features of the SP variants, the RC variant provides the option of external control. Furthermore, when operating the microphone button, an external device can be controlled via the control output.

Use a small Philips screwdriver to open the cover for the rotary switch as indicated by the arrow. The rotary switch can be seen.

In order to select the requested button function with the rotary selector switch and for setting the frequency response, use a small Phillips screwdriver.

Use a small Philips screwdriver to close the cover for the rotary switch as indicated by the arrow. The rotary switch is covered.

For assignments of the rotary selector switch, please refer to the following table.

Position| Button Mode| HP Filter| LED Ring| Control ext. Dev.| Controlled by ext. Dev.
---|---|---|---|---|---
0| PTT| ON| ON| ON| ON
1| PTM| ON| ON| ON| ON
2| Remote only| ON| ON| OFF| ON
3| ON/OFF| ON| ON| ON| ON
4| PTT| OFF| ON| ON| ON
5| PTM| OFF| ON| ON| ON
6| Remote only| OFF| ON| OFF| ON
7| ON/OFF| OFF| ON| ON| ON
8| PTT| ON| OFF| ON| ON
9| PTM| ON| OFF| ON| ON
A| Remote only| ON| OFF| OFF| ON
B| ON/OFF| ON| OFF| ON| ON
C| PTT| OFF| OFF| ON| ON
D| PTM| OFF| OFF| ON| ON
E| Remote only| OFF| OFF| OFF| ON
F| ON/OFF| OFF| OFF| ON| ON

Maintenance

For cleaning the gooseneck microphone use a soft damp cloth. If necessary you can use a mild cleansing agent (such as washing-up liquid). Do not use any solvent agents and make sure that no water enters the transducer element.

Service

In the unlikely event of equipment failure, the microphone should be returned to your beyerdynamic dealer. Dismantling the microphone yourself will invalidate the guarantee.

Versions

Model/Description…………………………………. Order #

Classis GM 303 3-pin XLR plug, 300 mm [12″] . 722.383
Classis GM 305 3-pin XLR plug, 500 mm [20″] . 722.405

Classis GM 306
3-pin XLR plug, 600 mm [24″] . . 724.246

Classis GM 305 TG
5/8″internal thread / adapter to 3/8″ and M18x0.75 external thread, length 500 mm [20″], connecting cable 2.5 m [8.2 ft] with 4-pin female mini XLR connector, incl. ZSH 305 small base plate, wind shield. . . 727.571

Classis GM 313 SP
3-pin XLR plug, 300 mm [12″], phantom power adapter, programmable
button (PTT, PTM, ON/OFF) with braille, switchable low-cut filter, switchable LED ring . . . . . . . . . . . 729.787

Classis GM 315 SP
same as above,
but 500 mm [20″]. . . . . . . . . . . . 729.795

Classis GM 315
5-pin XLR plug, 500 mm [20″],
LED ring. . . . . . . . . . . . . . . . . . 722.456

Classis GM 315 E
5-pin XLR plug, 500 mm [20″], LED ring,
without preamp, for installation with
MCS 563 L, MCS 553 L,
MCS-D 3643,
inkl. wind shield. . . . . . . . . . . . 489.565

Classis GM 315 RC
5-pin XLR plug, 500 mm [20″], phantom power adapter, programmable
button (PTT, PTM, ON/OFF) with braille, switchable low-cut filter,
switchable LED ring, remote control . . . . . . . . . . . . . . . 729.809

Supplied Accessories

Model/Description . . . . . . . . . . . . . . . Order #
WS 302 B
Wind shield for
Classis GM series, black . . . . . . 722.782

Optional Accessories

MA-PVA (TG)
Phantom power adapter
4-pin Mini XLR (M) –
3-pin XLR (M) to connect
the Classis GM 305 TG
to mixing consoles . . . . . . . . . . . . 711.098

GMS 32
Shock-mounted holder for table
installations, 3-pin female
XLR connector. . . . . . . . . . . . . . . 729.582

GMS 52
same as above, but 5-pin
female XLR connector. . . . . . . . . . 729.434

ZSA 305
Mounting adapter for the use of
Classis GM 305 TG with ZSH 20. . 723.037

ZSH 20
Shock-mounted holder for
desktop installation . . . . . . . . . . . 454.559

Technical Specifications

Classis GM 303 – 306 / GM 313 – 315

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/31xSP. . . . . . . . . . . balanced with 3-pin XLR-plug
Wiring GM 31x/31xRC. . . . . . . . . . . 5-pin XLR-plug
Wiring GM 305 TG . . . . . . . . . . . . . balanced, 2.5 m
[8.2 ft.] long
connecting cable with
4-pin female mini XLR
connector for
MA-PVA (TG) phantom
power adapter with
3-pin XLR connector
Supply voltage GM 30x/31x . . . . . . . Phantom power 8 – 52 V
Supply voltage GM 31x SP/RC . . . . . Phantom power 8 – 52 V
Current consumption GM 30x/31x . . 2 mA
Current consumption GM 31x SP/RC . 9 mA
Current consumption LED ring with
internal resistor of 500 Ω
at 5 V supply voltage. . . . . . . . . . . . 6 mA
at 12 V supply voltage. . . . . . . . . . . 20 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

Classis GM 315 RC additional functions

External operating button . . . . . . . . Switching to ground
MOSFET switching output . . . . . . . . < 10 Ω with microphone
I < 100 mA; U < 30 V

MOSFET switching output
Pin 4 is a MOSFET switching output to control external devices. When the microphone is activated the output is lowresistance to ground (< 10 Ω). In the “Remote only” mode this output controls the microphone button. As long as this button is pressed, the output is pulled to ground. In principle, DC signals can be switched, the maximum current is 100 mA, the maximum voltage is 30 V. With larger loads, the output can be used to control an additional circuit breaker.

Classis GM 315 E

Transducer type . . . . . . . . . . . . . . . Electret condenser
Operating principle . . . . . . . . . . . . . Pressure gradient
Polar pattern . . . . . . . . . . . . . . . . . Cardioid
Frequency response . . . . . . . . . . . . 50 – 19,000 Hz
Open circuit voltage . . . . . . . . . . . . 17 mV/Pa
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 31x . . . . . . . . . . . . . . . . 5-pin XLR connector
Current consumption LED ring with internal series resistor of 500 Ω
at 5 V supply voltage . . . . . . . . . . 6 mA
at 12 V supply voltage . . . . . . . . . 20 mA
Electrical parameters of the capsule with 2-pole connection without the MA-PVA (TG) phantom power adapter:
Supply voltage . . . . . . . . . . . . . . . . 1.5 – 10 V
Series resistor (recommended) . . . . . 2.2 kohms
Sensitivity . . . . . . . . . . . . . . . . . . . approx. -47 dBV/Pa
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