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Bogen CAM2 Stereo Amplifier User Manual

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1. wu Go 9 A mazzza OPS COM 25V 25V 80 707V amp BAL LINE AUX RCA Patch Cord Bridging Connections In certain applications more than four microphones or a single AUX input is needed In these cases CAM2 can be connected to another to increase the number of inputs available The BRIDGING connectors are provided for this purpose To combine two to four CAM2 units together connect an RCA patch cord between either of the BRIDGING connectors on one unit to either of the BRIDGING connectors of the other unit The 2 RCA Bridging connectors on the are wired together in parallel to allow units to be easily daisy chained together The Bridging connectors provide access to the internal mix bus of each CAM2 When bridged together the output of of the units can be used as the output to other equipment because the same output signal is present on each unit s output However master volume control for all of the mixers will be the MASTER control on the CAM2 whose output is being used The MASTER control of all of the other units have no effect on system volume See the section on operation for more information Note Bridging more than four CAM2 units together may reduce the maximum system output signal level below what is necessary to drive amplifiers and recording equipment COMMUNICATIONS INC MODEL CAM 2
2. OUTPUT LEVEL 4dB 50dB GND BAL OUT LINE OUT on ana yes OFF ONG n eR Ol OFF OFF MIC 4 MIC 3 MIC 2 OOOO MIC 1 Combined mixer output signal to amplification or recording equipment This unit s Master Volume knob controls the overall volume level for all mixers bridged together GEN COMMUNICATIONS INC OUTPUT LEVEL 4dB 50dB o BAL OUT rim en m ON OFF P OFF buo ere OOO0 MIC 4 MIC 3 MIC 2 MIC 1 COMMUNICATIONS INC RAMSEY NJ 07446 MODEL CAM 2 GND OUTPUT LEVEL cim 4 50dB amp BAL OUT PHANTOM zi om uS OFF ONOFF ONOFF ue OOOO MIC 4 MIC 3 MIC 2 MIC 1 Power POWER ON This switch applies power to the unit The Switch Actuator will light to indicate power ON when connected to an AC power source FF MIC Gain Control MIC 10 The four MIC volume controls are used to adjust the level of individual mic input channels Rotate these controls clockwise to the higher numbers to increase volume and counter clockwise to the lower numbers to reduce volume Use these controls and the AUX control to mix the input signals to the desired levels 0 10 AUX Gain Control AUXO Controls the AUX input v
3. Controls the gain level of the AUX input 4 Output Meter LED meter indicates peak output signal level 5 Master Gain Control Adjusts the overall output level 6 Power Switch amp Power Indicator Power switch will illuminate when Power Switch is turned ON Rear Panel BOGEN QUTPUTLEVEL N joda MN 408 50dB e e ON OFF ONOFF ONOFF ON OFF MODEL CAM 2 ap on on 62 Q 5 amen hr HA MC3 MIC2 1 Power Connection 120V AC 60Hz 043A 2 Output XLR Connector Provides a balanced output compatible with most professional audio equipment 3 Output Level Switch Switch changes the nominal signal level of the XLR output from 4dB to 50dB 4 Line Output Connector Line Out RCA jack provides output signal levels compatible with most amplifiers recording equipment and other audio equipment Not affected by Output Level switch 5 Bridging The bridging jacks facilitate the connecting together of mixers to obtain additional inputs without using any of the CAM2 inputs 6 Auxiliary Input AUX In A dedicated unbalanced auxiliary input for tuner tape deck CD player etc 7 MIC Inputs Balanced MIC level XLR inputs 8 Phantom Power The CAM2 provides power for electret condenser microphones The Phantom ON OFF switch controls the applications of DC voltage to each MIC input Microphone Inputs Microphones are connected to the CAM2 using the MIC1 through MIC 4 connectors The
4. aont P e tb IE 10 Clip lridllCaEOT toro tee te aa een diae ee eoe 10 Master Gain Control Output n D er IRB AUDIO SYSTEM LEVEL Setting System Levels n LIMITED Introduction The Bogen Model is a mixer pre amplifier that provides four MIC inputs and one AUX input while supply ing both MIC and high level outputs The is particularly well suited for expanding the number of inputs of Bogen public address amplifiers The CAM2 accommodates low impedance microphones and has an input for tuners or other high level sources Outputs are provided for high impedance unbalanced and low impedance balanced MIC inputs and line level inputs to a public address amplifier tape deck or similar equipment Units may be interconnected to provide a greater num ber of inputs The CAM2 operates from a 120V AC 60Hz source It may be mounted in a standard 19 equipment rack using a Bogen Model RPK35B rack mounting kit in a wall with a Bogen Model WMK1 in wall mounting kit Caution To reduce the risk of fire or electric shock do not expose this unit to rain or excessive moisture Unpacking Your unit was carefully checked before leaving the factory Inspect the shipping container and the unit carefully for indications of improper handling If the unit has been damaged make an immediate claim to the distributor from whom it was pu
5. level of the CAM2 will be reduced to one that is compatible with microphone inputs The CAM2 BAL OUT connector requires a female XLR connector and the microphone inputs of other equipment typically require a male XLR Therefore a female to male XLR cable must be used for this type of connection The diagram below shows the wiring of this type of cable and also the correct OUTPUT LEVEL switch position for feeding micro phone inputs BAL OUT Connector Connector Back View P opi Back View r E ecl f Female XLR End Male XLR End From CAM2 BAL OUT To MIC input of other equipment LINE OUT Unbalanced inputs are also popular on many pieces of equipment that the CAM2 may feed To make the connection as easy as possible the CAM2 provides an unbalanced LINE OUT signal that is of the proper signal level to connect to most equipment An RCA patch cord is LINE OUT used to make this connection and is commonly available at retail stores Since this output is unbalanced it is important to keep the length of the connecting cable relatively short Less than 10 feet is recommended The figure below shows the general way in which the LINE OUT of the is connected to the unbalanced input of an amplifier Typical Amplifier with Unbalanced Input BOGEN BOGERI OUTPUT LEVEL RAMSEY N J PEUT NED COMMUNICATIONS INC RAMSEY NJ 07446 44dB 50dB BRIDGING ON OFI
6. the output from the CAM2 AUX would be distorted and unusable IN Since it is common to have recorded music mixed together with live sound from microphones the CAM2 provides a single AUX input for the connection of a tape deck CD player tuner or similar equipment The AUX IN connec tion has the appropriate input sensitivity to accept signals from these types of equipment The input uses an unbal anced RCA connector which is typical of the output from playback equipment RCA patch cords are readily avail able for making connections to this input However this is a mono input so the output from a stereo source must be combined by a Y adapter so that both halves of the stereo playback are heard The AUX input is an unbalanced input When using unbalanced inputs it is a good idea to keep the length of the connecting cable to 10 feet or less CD Player Tape Player or Tuner i Y Adapter 1 ume BRIDGING ONOFF ONOFF ON OFF ON OFF AAA E k LINE AUX BAL OUT OUT IN RCA Patch Cord RCA End BAL OUT to Balanced Input of Other Equipment The CAM2 provides a balanced output signal from the male XLR connector labeled BAL OUT Many types of professional equipment like power amplifiers have balanced ae inputs that are compatible with this output The fig
7. BOGEN CAM2 Mixer Pre Amplifier Installation and Use Manual 2001 Bogen Communications Inc All rights reserved Specifications subject to change 54 2039 01R2 Printed in Korea 0112 Notice Every effort was made to ensure that the information in this guide was complete and accurate at the time of printing However information is subject to change Important Safety Information Always follow these basic safety precautions when installing and using the unit 1 Read all instructions 2 Follow all warnings and instructions marked on the product 3 DO NOT place the product a separate enclosure or cab inet unless proper ventilation is provided 4 Never spill liquid on the product Repair or service must be performed by a factory author ized repair facility 6 DO NCT staple or otherwise attach the AC power supply cord to building surfaces 7 DO NOT use the product near water or in a wet or damp place such as a wet basement 8 DO NOT use extension cords The product must be installed within 6 feet of a grounded outlet receptacle 9 Use caution when installing or modifying paging or control lines Applications Assistance Our Applications Engineering Department is available to assist you from 8 30 A M to 6 00 PM and on call until 8 00 P M Eastern Standard Daylight Time Monday through Friday Call 1 800 999 2809 Option 2 Domestic and International Listings The CAM2 is a UL CSA listed pr
8. CAM2 uses male XLR type connectors for making connections to its inputs Microphones typically accept female XLR connectors Cables with male and female XLR connectors already attached are commonly available at retail stores or through Bogen The figure below shows the connection of various microphones Dynamic Microphones Note Phantom is ON for use with Condenser Microphone OUTPUT LEVEL PHANTOM ur 4dB 50dB BI ONOFF ONOFF ONOFF ONOFF BAUoUT LINE AUX mic2 Male XLR Connectors Phantom Power Each MIC input has a PHANTOM switch associated with it This switch must be set correctly for the type of microphone being used with that MIC input Microphones come in two basic types Dynamic and Electret Condenser When using Dynamic microphones set the PHANTOM switch for that microphone Female XLR Connectors Condenser Microphone Requires Phantom Power e EE t PHANTOM 4 e ON OFF ON OFF ONOFF ON OFF input to OFF When using an Electret Condenser microphone set the PHANTOM switch to ON Elecret Condenser microphones require a DC voltage to power their internal circuitry When the PHANTOM switch is set to ON the microphone input will supply a DC voltage back to the Elec
9. d could be causing poor sound quality Turn down the MASTER control or the individual control of a particularly loud input to bring the meter out of the red range See the section on setting up system gains for further tips on levels 10 Setting System Levels In audio systems that employ separate mixers and amplifiers there are quite a few controls that affect the volume of a signal Knowing how to set these different volume controls is instrumental to proper system operation In gen eral the closer the control is to the signal source the higher that control should be set For example an audio system contains a microphone a 2 and a power amplifier There 3 controls that affect the volume of the microphone through the audio system speakers the MIC input control the CAM2 MASTER con trol and the volume control on the amplifier How should these be set for best operation Since the MIC control is the closest electrically the microphone should be turned up the highest while still allowing enough headroom to increase the microphone volume if necessary The MASTER control should then be adjusted to produce an out put signal that lights up the red output meter indicator only on loud peaks and the volume control of the amplifier should be set so that the volume of the speakers are as loud as could possibly be needed By setting the volume controls this way the amount of undesirable hiss noise which is produced in all audio equipm
10. ent is minimized This is the correct theory in setting up system gains volume levels However there are some other factors that ought to be considered For instance the individual input control should not be set so high that it requires the MAS TER control to be set near zero to keep the output signal level out of the red There has to be a reasonable amount of control range to the MASTER control to make it useful In this case it is a good idea to reduce the level of the individual input control so that the MASTER control can be rotated over a wider range to provide some overall level control During normal operation of a well set up audio system the MASTER control is used to increase or decrease the overall system level as the noise and audience increases and decreases However large changes in the necessary volume level should be adjusted at the power amplifier If the signal output level of the CAM2 is near its maximum as indicated by the output level meter and the desired speaker level cannot be achieved even with the power amplifier volume at full it indicates that the power amplifier or the size quantity of the speaker is not ade quate to cover the desired area This type of problem cannot be corrected by system volume control settings Trying to get more volume out of a system under these circumstance can only lead to distorted sound since the audio equipment will be pushed beyond their designed maximum operating conditions Correct the pr
11. ncluding but not limited to loss of profits loss of data or loss of use damages arising out of the manufacture sale or supplying of products even if Bogen has been advised of the possibility of such damages or losses Products that are out of warranty will also be repaired by the Bogen Factory Service Department same address as above or call 201 934 8500 The parts and labor involved in these repairs are warranted for 90 days when repaired by the Bogen Factory Service Department All shipping charges in addition to parts and labor charges will be at the owner s expense BOGERI COMMUNICATIONS INC 50 Spring Street Ramsey NJ 07446 U S A Tel 201 934 8500 Fax 201 934 9832 www bogen com
12. oblem by getting more suitable equipment for the job It is typically desirable to get as much signal level from the output of the CAM2 without making it so large that the output circuit cannot maintain the signal level and begins to distort the signal 11 Rated Output Levels Bal Out Line Out Frequency Response Distortion at Rated Output Headroom MIC Input Equivalent Input Noise MIC Input Sensitivity MIC Input Impedance Aux Input Signal to Noise Aux Input Sensitivity Aux Input Impedance Bal Out Output Impedance Bal Out Nominal Load Impedance Line Out Output Impedance Line Out Nominal Load Impedance Crosstalk adjacent channels Phantom Power Output Level Meter Bar Graph MIC Input Clipping LED Controls Temperature Range Power Consumption Dimensions Shipping Weight 4dBu or 50dBu switch selected OdBu 1dB 20Hz to 20kHz Less than 5 10dB 123dBV 150 ohms source 22Hz 22kHz 300uV for rated output 600 ohms 75dB Ref to rated output level 22Hz 22kHz 70mV for rated output 10k ohms 140 ohms 4dBu positions 600 ohms 50 ohms 600 ohms Better than 90dB 12V DC 3 0 3 8 12dB 29dBV 35mV 4 MIC controls 1 AUX control 1 MASTER control 1 POWER switch 4 Phantom Power switches BAL OUT Output Level switch 10 to 48 C 14 to 120 F 120V AC 60Hz 043A 11 3 8 W x 2 7 8 H x 7 3 4 D 4 lbs LIMITED WARRANTY The Bogen is warranted to be free fr
13. oduct Contents Page INTRODUCTION amp INSTALLATION ccccccscssscrssssescsccsssseesssessssceesesesesscesscscessesesssscesosesees 3 RS 3 3 PANEL en r r 4 Front Panel su Be M 4 Rear Parvel i 4 INPUT CONNECTIONS seen nass EREA ARARE RAEES 5 6 Microphone Inputs rere trente 5 Phantom Powel Rep dece a MERE dee Dota Re Ane Uer sa etae Nee 5 Microphione Cable Wiring tirer tet otn ee vie EL In eee ae b dada natu 6 Sip 6 OUTPUT CONNECTIONNSS eere eee teen eee tn sets ntt tn satus sias sense esses tasses ss senses nao 7 8 BAL OUT to Balanced Input of Other 7 BAL OUT to Microphone Input of Other Equipment eese entente tentent tnter 7 LINE OUT m jJ 9 Bridging Connections ie cte P Re al Reis sped o dedo isn 9 Unn 10 ll M 10 re etre ee eee dine aet abo e dels 10 AUX Gain Coritrol ert ne
14. olume and functions the same as the MIC volume controls Clip Indicator 10 Each input channel has a dedicated red clip CLIP ping indicator to the right of the channel s 10 MIC 20 MIC 30 MIC 40 AUXO label During normal operation the CLIP indicators for each input should remain unlit or light infrequently If the indicator is lighting frequently or constantly it indicates that the input is being overdriven by too much input signal level The input of the CAM2 can only accept signals up to a certain level Once the input signal becomes larg er than the handling capability of the input circuits the circuitry will begin to distort the input signal The distortion will produce poor sound quality on that channel This condition is called overdriving the input The distortion of the input signal cannot be corrected by turning down the input level control because the signal is being distorted before the level control can affect it All the level control can do in this case is adjust the level of the now distorted sig nal To correct this situation the level of the signal source must be reduced so that it is no longer overdriving the input Typically microphones will not overdrive their inputs However other equipment that is connected to a MIC input has a high likelihood of overdriving the input Note that the 5OdB setting of the CAM2 BAL OUT s Output Level switch was provided to avoid this very situation when a CAM2 BAL OUT signal is connec
15. om defects in material or workmanship provided that the product has not been subjected to abuse or accident or altered in any way for two 2 years from the date of sale to the original purchaser Any part of the product covered by this warranty that with normal installation and use becomes defective will be repaired or replaced by Bogen at our option provided the product is shipped insured and prepaid to Bogen Factory Service Department 50 Spring Street Ramsey NJ 07446 USA The product will be returned to you freight prepaid This warranty does not extend to any of our products that have been subjected to misuse improper storage neglect accident improper installation or have been modified or repaired in any manner that Bogen believes may affect the reliability of the product or where the serial number or date code has been removed or defaced THE FOREGOING LIMITED WARRANTY IS BOGEN S SOLE AND EXCLUSIVE WARRANTY AND THE PURCHASER S SOLE AND EXCLUSIVE REMEDY BOGEN MAKES NO OTHER WAR RANTIES OF ANY KIND EITHER EXPRESS OR IMPLIED AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED AND EXCLUDED Bogen s liability arising out of the manufacture sale or supplying of products or their use disposition whether based upon warranty contract tort or otherwise shall be limited to the price of the product In no event shall Bogen be liable for special incidental or consequential damages i
16. rchased If it was shipped to you notify the transportation company and place a claim Power amp Grounding The AC line cord has a three prong plug that should be plugged into a three wire grounded 120V AC 60Hz out let If a three wire outlet is not available then use an adapter and secure the pigtail lead to the grounded wall plate mounting screw It is important to ground the unit If the wall plate screw is not grounded connect the wire from the GND terminal of the mixer pre amplifier to a suitable earth ground Installation Rack Mounting Bogen Model RPK35B Rack Panel Kit is designed to mount the CAM2 in a standard 19 sound equipment rack The panel is fabricated from cold rolled steel and finished in black enamel In Wall Mounting Bogen Model is designed to mount the mixer pre amplifier flush in a wall Depth of the mounted unit is 3 1 2 Front Panel CAM 2 CLIP BOGEN 1 1 MIC 10 MIC 20 MIC 30 MIC 40 AUXO 30 master POWER 00 ON E of 0 o 10 0 10 of 10 o X 2 1 Input Over Voltage LEDs Clipping LED LED will light when input is overdriven 2 MIC Channel Gain Controls Controls the gain levels of the MIC channels 3 AUX Gain Control
17. ted to another MIC input The AUX input can also be overdriven but the signal levels necessary to do this are much higher than those of a MIC input Normally using the outputs of CD players tuners and tape players will not cause this problem However connection to the speaker outputs of boom boxes stereo amplifiers and other equipment designed to drive speakers can overdrive the AUX input Master Gain Control MASTER This control regulates the overall output level of the CAM2 After setting the MIC and AUX con trols to provide the desired mix of input signal sources adjust the MASTER control for the desired overall volume level throughout the audio system The MASTER gain control affects both the BAL OUT and LINE OUT signals Output Level Meter The output level meter is provided as a tool for getting the optimum performance from the 3 O CAM 72 Using the individual level controls and the master adjust the levels as desired but below 00 the level that caused the red 3 output level meter indicator to light it can light infrequently on 3 O short peaks in the sound If the output signal is very low as in quiet passages in music the out 8 O put level meter may not light at all It was designed to assist in the operation of the CAM2 as the 12 O output signal levels approach critical maximum output level If the red indicator is flashing fre quently or constantly it means that the output signal from the CAM2 is becoming distorted an
18. tret Condenser microphone through the microphone cable this is called providing Phantom Power to the microphone If the PHANTOM switch is set to ON when using a Dynamic microphone you may hear a loud pop every time the microphones ON OFF switch is changed If you do hear this then check that the PHANTOM switch for that micro phone input is set properly Microphone Cable Wiring AUX IN The has female XLR connectors as its microphone inputs these connectors have 3 pins and are designed to be connected to balanced low impedance microphones These microphones require 3 connections and use a cable that has two insulated conductors and a shielding material that encases the conductors the shield provides the third connection The use of balanced microphones provides superior protection against the pickup of unwanted hum noise and interference It allows long cables to be used to connect the microphones to the CAM2 The figure below shows how to wire the Male and Female XLR connectors onto a 2 conductor with shield cable to make custom microphone cables Connector Connector Back View shield N Back View Male XLR End Female XLR End To CAM2 MIC Input To Microphone XX 52 V Certain music input sources such as tape decks and CD players send larger signal levels that microphone inputs are not suited to accept Microphone inputs are very sensitive and if one of these devices were connected to a microphone input then
19. ure below shows the connection to a 4dB 50dB balanced input that has screw terminals Many balanced inputs use XLR connectors For XLR inputs a standard MIC cable can be used The figure in the next section shows this type of cable The balanced output provides the same type of protection from noise and interference that the balanced microphones have and requires 3 wires to make the con nections For the best results use this output connector if running the CAM2 output over long distances When using the BAL OUT to feed amplification or recording equip BAL OUT ment set the OUTPUT LEVEL switch to the 4dB position This position provides the larger output voltages relative to the smaller microphone output signals required by other equipment Connector Back View Signal B 7 Ground Sg 4 ne zx A G BAL INPUT Female XLR End From CAM2 BAL OUT BAL OUT to Microphone Input of Other Equipment It is sometimes necessary to feed the CAM2 output to the microphone input of anoth OUTPUT LEVEL er piece of equipment However the signal level of the CAM2 s output must be at a volt age level compatible with microphone inputs Microphone inputs require much smaller 4dB 50dB signal voltages than the inputs of other equipment To accommodate this requirement the CAM2 OUTPUT LEVEL switch can be set to the 50dB position In this position the out put

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