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CQ15/CQ31  OVERVIEW

• Stereo 15-band (CQ15) or monophonic 31-band (CQ31) graphic EQ

• Built in optical compressor / limiter per channel  

• Selectable pre- / post-EQ compressor operation with true circuit bypass

• Balanced and unbalanced inputs and outputs 

• Euro Block input and output connectors for fixed installations 

• 1U rugged metal case construction

The CQ15 and CQ31 combination graphic equalizers / optical compressors offer 
control over both frequency and level in a convenient single-space rackmount 
format. The stereo CG15 and monophonic CQ31 are ideally suited for a variety of 
live and installed sound applications, and are equally at home in the equipment 
racks of bass players, keyboardists, and DJs.

 

 

 

Each of the CQ15’s two channels features 15 bands (2/3-octave) of equalization
with selectable ±6dB / ±12dB range. The compressors, one per channel and 
available pre- or post-EQ (and featuring true circuit bypass) are designed to 
address a variety of tasks, from harnessing troublesome peaks to putting a tight 
low end on a stereo DJ mix. 

When finer band-resolution is required, the CQ31 offers a full 31 bands 
(1/3-octave) of equalization with selectable ±6dB / ±12dB range, topped off by 
a fully adjustable optical compressor. As with the CQ15, the compressor is
available pre- or post-EQ and features true circuit bypass.

 

   

 

 

 

 

SM PRO AUDIO CQ15/CQ31

0

6

12

+

6

12

-

0

3

6

+

3

6

-

20

25

31.5

40

50

63

80

100

125

160

200

250

315

400

500

630

800

1k

1.25k

1.6k

2k

2.5k

3.15k

4k

5k

6.3k

8k

10k

12.5k

16k

20k

20

25

31.5

40

50

63

80

100

125

160

200

250

315

400

500

630

800

1k

1.25k

1.6k

2k

2.5k

3.15k

4k

5k

6.3k

8k

10k

12.5k

16k

20k

POWER

ON

O FF

C Q 3 1

GRAPH IC EQUAL IZER

RA NGE

BYPASS

LOW C UT

+

-

12

 IN PUT  LEVEL

R ELEASE

PE AK

OPTICAL COM PRESSOR

C OMP

ATTACK

B EQ

6

+

-

8 0H z

A EQ

0

6

12

+

6

12

0

6

12

+

6

12

-

-

0

0

3

3

6

6

+

+

3

3

6

6

-

-

Channel A

Channel B

16k

16k

10k

10k

6.3k

6.3k

4k

4k

2.5k

2.5k

1.6k

1.6k

1k

1k

630

630

400

400

250

250

160

160

100

100

63

63

40

40

25

25

C Q 15

GRAPH IC EQUAL IZER

R ANGE

BYPASS

LO W CU T

+

-

1 2

 INPU T L EVEL

RELEAS E

P EAK

OPTICAL COM PRESSOR

COMP

ATTAC K

BEQ

6

+

-

80 Hz

AEQ

R AN GE

BY PASS

LOW CU T

+

-

1 2

 INPUT L EVEL

RELEA SE

P EAK

OPT ICAL COM PRESSOR

CO MP

ATTAC K

BEQ

6

+

-

80 Hz

AEQ

POWER

O N

OF F

main features

Summary of Contents for CQ15

Page 1: ...CQ15 CQ31 Version 1 0 SM PRO AUDIO CQ15 CQ31 Graphic EQualizer compressor ...

Page 2: ...r Source Make sure your equipment is set to the correct voltage for the country in which it will be used Grounding and Polarization Precautions should be taken so that the equipment s electrical grounding or polarization is not defeated Power Cord Protection Power supply cords should be routed so that they are not likely to be walked on pinched damaged worn or rubbed by any other device or obstacl...

Page 3: ...Nevertheless we recommend that you carefully examine the packaging and its contents for any signs of physical damage which may have occurred in transit If the unit is damaged please do not return it to us but notify your dealer and the shipping company immediately otherwise claims for damage or replacement may not be granted Shipping claims must be made by the consignee The SM Pro Audio CQ15 CQ31 ...

Page 4: ...aks to putting a tight low end on a stereo DJ mix When finer band resolution is required the CQ31 offers a full 31 bands 1 3 octave of equalization with selectable 6dB 12dB range topped off by a fully adjustable optical compressor As with the CQ15 the compressor is available pre or post EQ and features true circuit bypass SM PRO AUDIO CQ15 CQ31 0 6 12 6 12 0 3 6 3 6 20 25 31 5 40 50 63 80 100 125 ...

Page 5: ...anced Euro Block CQ15 Outputs Channel A Channel B Balanced XLR Channel A Channel B Unbalanced 1 4 TRS Channel A Channel B Balanced Euro Block CQ31 Inputs Channel A Balanced XLR Channel A Unbalanced 1 4 TRS Channel A Balanced Euro Block CQ31 Outputs Channel A Balanced XLR Channel A Unbalanced 1 4 TRS Channel A Balanced Euro Block INPUT OUTPUT The CQ15 CQ31 accepts line level input signals upto 23dB...

Page 6: ...trols The CQ15 features 15 adjustable frequency bands per channel spaced at 2 3 octave intervals The CQ31 features 31 adjustable frequency bands spaced at 1 3 octave Both units offer the same complement of controls Faders Raise the fader above the 0dB line to boost EQ at the chosen band lower the fader to attenuate the EQ Range Use to set the throw of the frequency band faders to 6dB or 12dB Bypas...

Page 7: ...resulting in greater reductions in dynamic range For example a compression ratio of 5 1 means that when the input level increases by 5dB the output level will increase by only 1dB Compression On Off Switch LED Indicator Turns the compressor on or off When off the compression circuit is completely removed from the signal path i e true bypass The LED shows compressor s on off status Attack Use to se...

Page 8: ... a graphic EQ can also be used to control feedback Since the CQ15 and CQ31 both include optical compressors greater flexibility in both signal processing and control is available For example you can boost high frequencies to create clarity while at the same time compressing the high frequencies so that the occasional transient peak won t harm your sound system or your audience s ears You can also ...

Page 9: ...xpressly excluded from this warranty in particular if caused by inappropriate use Likewise the warranty does not cover defects of expendable parts caused by normal wear of the product Expendable parts are typically pots potentiometers switches and similar components Damages defects caused by the following conditions are not covered by this warranty Misuse and or abuse Neglect or failure to operate...

Page 10: ...ng instructions CLAIM FOR DAMAGES Failure of SM Pro Audio to provide proper warranty service shall not entitle the buyer to claim consequential damages In no event shall the liability of SM Pro Audio exceed the invoiced value of the product CQ15 Features 2 x 15 Bands of Equalization Selectable 6dB 12dB Fader Range per Channel Optical Compressor per Channel w Adjustable Input Level Compression Rati...

Page 11: ...ge without notice No part of this manual may be reproduced or transmitted in any form or by any means electronic or mechanical including photocopying and recording of any kind for any purpose without the express written permission of SM Pro Audio All Rights Reserved 2011 SM Pro Audio ...

Page 12: ...SMPROAUDIO M Patch 2 SM PRO AUDIO CQ15 CQ31 CQ15 CQ31 Graphic EQualizer compressor ...

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