CRM 100-RF Retractable through- table omni-directional ... - prodyTel

14 

Clockaudio - Boundary Microphones 

CRM 100-RF Retractable throughtable 

omni-directional condenser 

microphone 

The CRM100-RF is a boundary layer, through-table, omni-directional 

condenser microphone, with a built-in mechanism that will allow the 

user to make the microphone ‘disappear’ without having to physically 

remove it from the table. This is achieved by simply pressing the top of 

the microphone downwards until it locks; then by pressing the microphone 

again it will raise itself back to its original position above the surface of 

the table. Engineered in high quality brass with built-in shock mount 

and RF filter. 

Features: 

• Easy to install 

• Low profile at surface level 

• Unique ability to lock capsule away from 

sight when not in use 

• Robust brass construction 

• Omni-directional polar pattern 

• Built-in RF filter 

• Balanced output 

• Supplied with 2m (6.6 ft) 2 core + screen 

cable 

• Satin Nickel or Black Nextel finish 

Models: 

CRM 100-RF 

Model: CRM 100-RF 

Type Condenser (Back Electret) 

Polar Pattern 

Frequency Response 

Sensitivity 

Impedance 

Omni-directional 

30Hz ~ 20KHz 

= RF-Immunity Version 

-42.5dB +/- 3dB @ 1KHz (0dB = 1v/Pa) 

200Ω 

S/N Ratio 68dB(A) 

Maximum SPL 

Power Requirements 

Termination 

Dimensions 

120dB at 1KHz 1% T.H.D. 

9 ~ 48v Phantom Power 

Open ended 

Above Table: 15.00mm (0.59”) 

Diameter: 36.00mm (1.42”) 

Below Table: 111.00mm (4.37”) 

Diameter: 30.00mm (1.18”) 

CRM 102-RF Retractable throughtable 

half-cardioid condenser 

microphone 

The CRM102-RF is a boundary layer, through-table, cardioid condenser 

microphone, with a built-in mechanism that will allow the user to make 

the microphone ‘disappear’ without having to physically remove it from 

the table. This is achieved by simply pressing the top of the microphone 

downwards until it locks; then by pressing the microphone again it will 

raise itself back to its original position above the surface of the table. 

Engineered in high quality brass with built-in shock mount and RF filter. 

Features: 



• Unique ability to lock capsule away from 



• Cardioid polar pattern 

• Built-in RF filter 


• Supplied with 2m (6.6 ft) 2 core + screen 

cable 


Models: 

CRM 102-RF 

Model: CRM 102-RF 


Polar Pattern 


Sensitivity 

Impedance 

Half Cardioid 

50Hz - 18KHz 

-47dB +/- 3dB @ 1KHz (0dB = 1v/Pa) 

200Ω 

S/N Ratio 64dB(A) 

Maximum SPL 


Termination 

Dimensions 

125db at 1KHz 1% T.H.D. 


Open ended 

Above Table: 15.00mm (0.59”) 

Diameter: 36.00mm (1.42”) 

Below Table: 111.00mm (4.37”) 

Diameter: 30.00mm (1.18”) 


The CRM 202-RF is a dual element boundary layer through table cardioid 

condenser microphone with a built-in mechanism that will allow the user 

to make the microphone disappear without having to physically remove 

it from the table. This is achieved by simply pressing the top of the 

microphone downwards until it locks; then by pressing the microphone 

again it will raise itself back to its original position above the surface of 

the table. It is designed to be placed in the middle of the conference 

table, with each element facing the participants. Engineered in high 

quality brass with built in shock mount and RF filter. Standard finish: 

Black Nextel or Satin Nickel. 

Features: 

• O�ering two independently wired 

microphones 

• Integral reed contact switch 

designed to be used for remote 

switching 



• Unique ability to lock capsules 

away from sight when not in use 


• Cardioid polar pattern 

• Built in RF filter 


• Supplied with 2 x 2m (6.6ft) 2 core + 

screen audio cable 


Models: 

Model: 


Polar Pattern 


Sensitivity 

Impedance 

Half Cardioid 

50Hz - 18 KHz 

-47dB +/- 3dB @ 1 KHz (0dB = 1v/Pa) 

200W 

S/N Ratio 64dB (A) 

Maximum SPL 


Termination 

Dimensions 


CRM 202S-RF 

125db at 1 KHz 1% T.H.D. 


Open ended 

Above Table: 2mm (0.08”) 

Diameter: 63mm (2.48”) 

Below Table: 112mm (4.41”) 

Diameter: 

56.5mm (2.22”) 


The CRM 202S-RF includes a Touch 

Sensitive Switch with Bi-Colour LED Halo 

mounted into the top of the microphone 

housing (See TS 001 page19 for details)

P R O F E S S I O N A L M I C R O P H O N E S Y S T E M S 

Installation guide 

1) Drill a 58mm (2.25”) hole through the table 

see fig A. 

2) Remove the nut and fit the CRM 202-RF 

through the 58mm (2.25”) hole see fig B. 

3) Replace nut and tighten to the underside of 

the table see fig C. 

4) Connections for each mic a + b will be 

identified: mic a (in line with screws has 

white sleeved cable), mic b has black 

sleeve and is 180deg from mic a: Red 

Phase +, White Phase – and screen 

Ground. 

Grey 2 core (red and blue wires) is to be 

used for remote switching, screen is not 

used. Also note switch is open circuit when 

the mic is down. Please take note 

programming will be needed on the 

DSP side to allow the microphone to 

be muted once retracted. 

5) Ready to go; simply push down on the 

centre of the CRM 202-RF to raise the 

microphone. Reverse this action to lock 

down. See fig D. 


The CRM 202-RF is a dual boundary layer through table cardioid condenser microphone, with a built-in 

mechanism that will allow the user to make the microphone disappear without having to physically 

remove it from the table. This is achieved by simply pressing the top of the microphone downwards 

until it locks; then by pressing the microphone again it will raise itself back to its original position 

above the surface of the table. Engineered in high quality brass with built in shock mount and RF filter. 

Fig A 

Fig B 

Mic a (white cable) in 

line with screws 

www.clockaudio.com 

Offering 2 independently wired mics a + b 

Fitted with a magnetic reed switch designed 

to be used for remote switching at the 

beginning and end of each session when the 

microphones are no longer in use. The 

switch contact is closed (ON) when the 

microphone is in the up position and (OFF) 

when retracted. 

Easy to install 

Low profile at surface level 

Unique ability to lock capsules away from 


Robust brass construction 

Cardioid polar pattern 

Built in RF filter 

Balanced output 

Supplied with 2 x 2m (6.6ft) 2 core + 

screen audio cable and 1 x grey 2 core cable 

for internal reed switch 

Satin Nickel (CRM 202N-RF) or Black Nextel 

(CRM 202-RF) finish

Fig 1 

P R O F E S S I O N A L M I C R O P H O N E S Y S T E M S 


The CRM 202S-RF is a dual boundary layer through table cardioid condenser microphone, with a builtin 

mechanism that will allow the user to make the microphone disappear without having to physically 

remove it from the table. The microphone is fitted with an electronic capacitive touch sensitive switch 

designed to be used for remote switching giving status red or green to identify when the microphone is 

live. Available in black Nextel (CRM 202S-RF) or stain nickel (CRM 202SN-RF) 

Fig A 

Fig B 

Fig C 

Fig 2 

Microphone features 

Polar pattern half cardioid 

Balanced output 

Power requirements 9-48V phantom power 

Cable 2m 4 core + screen 

Immune to RF artifacts 

Fig 3 

Installation guide 

1) Drill a 58mm (2.25”) hole through the table see fig A. 

2) Remove the nut and fit the CRM 202S-RF through the 58mm 

(2.25”) hole see fig B. 

3) Replace nut and tighten to the underside of the table see fig C. 

4) Connections for each mic a + b will be identified: mic a (in line 

with screws has white sleeved cable), mic b has black sleeve and 

is 180deg from mic a: Red Phase +, White Phase – and screen 

Ground. 

5) Switch wiring connections: 

Please note programming will be needed on the DSP side to 

allow the microphone to be muted. 

Red----- +12V supply 

Yellow— Open collector switch O/P 

Black----0V supply. 

Pink-----0V supply provides red LED. 

Green---0V supply provides green LED. 

Switch Features 

Touch sensitive switch which has a built in time delay 

of 0.1 seconds to avoid unwanted switching 

The switch must be programmed to operate in 

latching mode via a DSP and will become disabled 

once the mic is retracted. 

Power requirements 12Vdc from regulated power 

supply 

Cable 400mm 5 core colour coded, supplied open 

ended 

6) Using p-clamps provided fix cables to the underside of the table 

ensuring there is sufficient slack in the cable loom for the mic to 

operate See fig D. 

www.clockaudio.com 

Fig D, key: 

1) Head in raised position. 

2) Loop cable allowing at 

least 25mm (1”) out of the 

bottom of the CRM. 

3) Fit 3 x supplied P-clamps 

using self tap screws. 

4) Black audio cable. 

5) White audio cable. 

6) 5 x colour coded switch 

wires. 

7) Securing Nut.

CRM 100-RF Retractable through- table omni-directional ... - prodyTel

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