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2       CM-CU21 Technical Specification

CM-CU21 Technical Specification

Microphone Input

Gain Range: 

+20dB to +86dB.

Maximum Input Level:  -6dBu.

Equivalent Input Noise:  130dB Ref. 80dB gain with 150Ω termination. 
Equivalent Input Noise:  128dB Ref. 50dB gain with 150Ω termination.

C.M.R.R.: >60dB.
Frequency Response: 

±0.5dB 20Hz to 22kHz Ref 50dB gain @ 1kHz.

Electronically Balanced Line Input

Gain Range: 

-83dB to +10dB.

Maximum Input Level:  +25dBu.
C.M.R.R.: >70dB.
Frequency Response: 

±0.2dB 20Hz to 22kHz Ref 0dB @ 1kHz.

Transformer Balanced Monitor Inputs

Gain Range: 

-70dB to +7dB measured @ Headphone output.

Maximum Input Level:  +25dBu.
C.M.R.R.: >60dB.
Frequency Response: 

±0.5dB 20Hz to 22kHz Ref 0dB @ 1kHz.

Transformer Balanced Main Outputs

Maximum Output Level   +24dBu. 

(limiter off): 
Frequency Response: 

±0.5dB 20Hz to 22kHz Ref 0dB @ 1kHz.

Noise: 

-94dB Average weighting Ref +8dB Line input.

THD & N: 

<0.02% Ref. 1kHz @ +8dBu.

THD & N: 

<0.065% Ref. 1kHz @ +18dBu.

1% Distortion Point: 

+18dBu @ 24Hz.

Transformer Balanced Talkback Outputs

Maximum Output  

+8dBu. 

Level Limited: 
Frequency Response: 

±0.5dB 20Hz to 22kHz Ref 0dB @ 1kHz.

Noise: 

-94dB Average weighting Ref +8dB Line input.

THD & N: 

<0.02% Ref. 1kHz @ +8dBu.

Gain Adjustment: 

0-12dB

Electronically Balanced Comm Outputs

Maximum Output  

Level Limited: 

+25dBu.

Frequency Response: 

±0.2dB 20Hz to 22kHz Ref 0dB @ 1kHz.

Noise: 

-98dB Average weighting Ref +8dB Line input.

THD & N: 

<0.002% Ref. 1kHz @ +8dBu.

Headphone Outputs

Gain Range: 

-66dB to +11dB.

Maximum Output Level:  +19dBu.
Frequency Response: 

±0.5dB 20Hz to 22kHz Ref 0dB @ 1kHz.

Noise: 

-85dB Average weighting Ref +8dB Line input.

THD & N: 

<0.005% Ref. 1kHz @ +8dBu.

Main Panel Operational Controls & Indicators

On-Air 1-3 Buttons: 

Illuminated buttons with latching action

Talkback A & B 

Illuminated buttons with selectable momentary

Buttons: 

and/or latching action

Headphone Monitor 

Input source level adjustment potentiometers 

Controls: 

Headphone channel selection switches

Line Input Level: 

Guest line input mode level potentiometer

Summary of Contents for CM-CU1

Page 1: ...Manufacturers of audio video products for radio TV broadcasters Commentator Units CM CU1 Commentator Unit for 1 Commentator Line Input CM CU21 Commentator Unit for 2 Commentators 1 Guest HANDBOOK...

Page 2: ...e vendor Sonifex Ltd shall not be liable for any loss or damage whatsoever arising from the use of information or any error contained in this manual No part of this manual may be reproduced or transmi...

Page 3: ...tering Setup Mode 9 Changing The Current Page 9 Changing The Option Mode Setting 9 Config Page 1 ON AIR Button Enable Disable TALKBACK Button Latching Modes 9 Config Page 2 Line Input Routing to Outpu...

Page 4: ...ut Routing to Output 24 Config Page 3 Commentator Mic Line Input Routing to Headphones 24 Config Page 4 Miscellaneous 25 Config Page 5 Limit LED Colour Limit Power LED Brightness 25 Config Page 6 ON A...

Page 5: ...Of CM CU1 6 Fig 2 1 CM CU21 Commentator Unit 15 Fig 2 2 CM CU21 Commentator Unit Block Diagram 16 Fig 2 3 Top Panel View Of CM CU21 17 Fig 2 4 Front Panel View Of CM CU21 19 Fig 2 5 Rear Panel View O...

Page 6: ...w sonifex co uk Register Online for an Extended 2 Year Warranty As standard Sonifex products are supplied with a 1 year back to base warranty If you register the product online you can increase your p...

Page 7: ...duct has been registered at the Sonifex website when the Warranty Term is 24 months from the date of despatch the Contract means the quotation these Conditions of Sale and any other document incorpora...

Page 8: ...est and expense of the Purchaser the Company will test the Goods to ascertain performance levels and provide a report of the results of that test The report will be accurate at the time of the test to...

Page 9: ...d to look inside the unit always disconnect the mains supply before removing the equipment covers The cover is connected to earth by means of the fixing screws It is essential to maintain this earth g...

Page 10: ...03 along with the related Directive 2002 95 EC on Restrictions of the use of certain Hazardous Substances in electrical and electronic equipment RoHS The Waste Electrical and Electronic Equipment Dire...

Page 11: ...phones is also configurable to suit the application Four talkback output channels with a built in limiter are available to the commentator They have adjustable gain and can be linked to provide simult...

Page 12: ...2 1 CM CU1 System Diagram Fig 1 2 CM CU1 Commentator Unit Block Diagram...

Page 13: ...d towards the bottom ON AIR Button The ON AIR button routes the commentator microphone input signal to the Comm Output and to the Mix Output This button has a latching action press to activate and pre...

Page 14: ...er the left the right or to both ears when the switch is in the centre position By default the commentator input signal is only routed to the headphone monitor controls when the On Air control is acti...

Page 15: ...to 86dB is split into two to provide greater accuracy of adjustment The mic gain switch sets the base gain value of either 20dB or 50dB for the input The mic gain potentiometer can then be adjusted to...

Page 16: ...finger in the slot in the rear panel indicated by the ON AIR LOCK text on the top panel then slide your finger down the slot until you reach the pushbutton Fig 1 5 Rear Panel View Of CM CU1 Talkback...

Page 17: ...each output is shown below Comm 1 pulse Talkback A 2 pulses Talkback B 3 pulses Talkback C 4 pulses Talkback D 5 pulses The 5 return audio inputs function normally when the test tone is enabled This...

Page 18: ...tive open collector output 2 O TALKBACK A active open collector output 3 O TALKBACK B active open collector output 4 O TALKBACK C active open collector output 5 O TALKBACK D active open collector outp...

Page 19: ...Option Mode Setting Press the appropriate button once The number of flashes increases to indicate the new mode setting Once the maximum option mode setting has been reached the value wraps around to...

Page 20: ...when active default Mode 2 Limit indicator illuminates green when active Mode 3 Limit indicator illuminates red when active Mode 4 Limit indicator illuminates white when active This setting can be us...

Page 21: ...r 2 seconds These buttons will then illuminate red to verify that the options have been saved to backup set 1 To Save The Current Option Settings to Backup Set 2 Press and hold the ON AIR and TALKBACK...

Page 22: ...ximum Input Level 21dBu C M R R 55dB Frequency Response 0 5dB 20Hz to 22kHz Ref 0dBu 1kHz Transformer Balanced Mix Output Maximum Output Level Limiter Off 24dBu Frequency Response 0 5dB 20Hz to 22kHz...

Page 23: ...Rear Panel Operational Controls On Air Lock Switch to prevent On Air control from being deactivated Momentary push button to override on air lock T B Gang Switch to link operation of talkbacks A B C D...

Page 24: ...t XLR 4 pin male 12V DC 650mA Typical 850mA Maximum 24V DC 325mA Typical 425mA Maximum Earth Point M4 stud Equipment Type CM CU1 Commentator Unit 1 Presenter Physical Specification Dimensions Raw 270m...

Page 25: ...ommentators They have adjustable gain and can be linked to provide simultaneous operation A wide input gain range and switchable phantom power on each commentary position provides supports for a varie...

Page 26: ...16 2 CM CU21 System Diagram Fig 2 2 CM CU21 Commentator Unit Block Diagram...

Page 27: ...e a latching action press to activate and press again to deactivate When an On Air control is active the button illuminates red and the corresponding open collector driver output on the GPIO port is a...

Page 28: ...to the headphone monitor controls when the corresponding On Air control is active It is possible to route each of these signals to the headphones permanently regardless of the state of the correspond...

Page 29: ...has a three way switch that sets the input type When the switch is in the bottom position the input is a line level input With the switch in the centre position the input is for microphones not requi...

Page 30: ...ext on the top panel then slide your finger down the slot until you reach the pushbutton Limiter Controls The limiter enable switch and level potentiometer control the limiter that is applied to the m...

Page 31: ...in prior to entering test tone mode Talkback Controls The TALKBACK GANG switch links the operation of each of the commentator s TALKBACK A and B buttons When this switch is on pressing one of the TAL...

Page 32: ...ctive open collector output 2 O Commentator 1 TALKBACK A active open collector output 3 O Commentator 1 TALKBACK B active open collector output 4 O Commentator 2 ON AIR active open collector output 5...

Page 33: ...t PPM illumination level setting Changing The Current Page Press and hold the Commentator 3 On Air button for at least 1 second The PPM display will change to indicate the new page Changing The Option...

Page 34: ...ed to Commentator 1 headphones default Mode 2 Commentator 3 line mode input is not routed to Commentator 1 headphones Commentator 1 TALKBACK A button No associated option on this page Commentator 1 TA...

Page 35: ...on this page Commentator 2 ON AIR button Mode 1 Temporary muting of enabled ON AIR channels is disabled default Mode 2 Temporary muting of enabled ON AIR channels is enabled For this setting to be av...

Page 36: ...tton brightness level 3 Mode 4 ON AIR and TALKBACK button brightness level 4 Mode 5 ON AIR and TALKBACK button brightness level 5 Mode 6 ON AIR and TALKBACK button brightness level 6 Mode 7 ON AIR and...

Page 37: ...hold the Commentator 1 On Air and Talkback A buttons for 2 seconds These buttons will then illuminate red to verify that backup set 1 has been loaded To Load Backup Set 2 And Overwrite The Current Opt...

Page 38: ...Ref 1kHz 8dBu THD N 0 065 Ref 1kHz 18dBu 1 Distortion Point 18dBu 24Hz Transformer Balanced Talkback Outputs Maximum Output 8dBu Level Limited Frequency Response 0 5dB 20Hz to 22kHz Ref 0dB 1kHz Noise...

Page 39: ...ator inputs 1 3 permanently routed to Commentator 1 2 headphones Commentator inputs 1 3 permanently routed to Commentator 1 2 headphones when respective input is On Air Display Preferences Limit LED c...

Page 40: ...CP Commentator Unit Front Cover Plate CM TC1 Commentator Unit Transport Case Dimensions Raw 530mm W x 210mm D x 415mm H CM CU21TP 20 9 W x 8 3 D x 16 3 H Dimensions Boxed 600mm W x 260 D x 420 H CM CU...

Page 41: ...a transport case CM TC1 which is supplied empty The illustrations below show the case open and empty with foam cut out for unit and cable Fig 3 1a and also closed Fig 3 1b Fig 3 1a CM TC1 Commentator...

Page 42: ...ies continued Commentator Front Cover Plate For the CM CU21 there is a front cover plate CM CU21CP which is used to cover the adjustments available on the front of the CM CU21 commentator unit with th...

Page 43: ...Notes...

Page 44: ...www sonifex co uk t 44 0 1933 650 700 f 44 0 1933 650 726 sales sonifex co uk...

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