Bogen CAM8 Musical Instrument User Manual
Contents
1. S3NI1Q3HSVQ SV3uv yur indu eur xny ap 0S p jndino sng o onu eur xny 81 LI urew Hat Al avd i 2i gp 9 e 8P 08 ooy Uns oIuJ 8ur Jeyur EET view yp MN Z LNdNI Vid ap 01 01 udeJo ger gp 22 i Je1e N oneu plouseiu eum olN e L m emen UE ME T V 20m gt T E ozr Ny o OVd Yo eter N EEE MEGA er 29091 5 1504 ap 0G 010 SUII OIIN xny lt o 2 Tr e L ald gP p 02 c dH lt L INdNI 01 01 indino xny wing 09 0 lv lt Q 00 W zog 4 n ap 02 2081 gp 03 8p 06 0 OL Page 28 of 32 Warranty The CAM8 and CAM8PRO are warranted to be free from defects in material or workmanship 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 hav2. Following the directions on page 19 set jumpers as shown in the drawing below J17 alone in both mixers 2 For both mixers remove jumper from position J2 and place it in position J1 This gives internal control of both auxiliary buses 3 Connect the two mixers as shown in the drawing below Mixer 1 Mixer 2 Aux Out Main Out Aux In Aux Out Main Out A Aux In Destination 1 receives inputs from mixer 2 with the Destination 2 receives inputs from mixer 2 with M A switch set to auxiliary and from mixer 1 with the the M A switch set to main and from mixer 1 with M A switch set to main the M A switch set to auxiliary Page 22 of 32 AC Power Connection This mixer is powered by an 18 Volt 1 5 Amp center tapped transformer supplied If anoth er AC supply is used it should be of equal voltage and have at least a 21 Volt Amp rating The details of the AC Power Jack on the rear panel are as shown in the following figure Center No connect Technical Support Our Applications Engineering Department is available to help you troubleshoot problems with your Bogen equipment Engineers are available from 8 30 AM to 6 00 PM Eastern Standard Time Phone 1 800 999 2809 Page 23 of 32 NO POWER Check the connections between the mixer and the power supply and the external AC power supply Examine the 4 pin connector as shown on page 23 Check the wall outlet NO SOUND Make sure the MIC Line switch is in
3. Note All the internal components jumpers and potentiometers to which adjustments are needed for built in features are highlighted within dashed areas in the drawing below Warning Adjustments made to any other internal components may void the warranty AUX IN MAIN OUT AUX OUT POWER AUX IN i J17 OO VAN Bus J18 AUX BUS METER SOURCE MAIN BUS J22 J23 AUX SOURCE Ji INT J2 EXT METER RESPONSE PEAK AVG J20 J21 OOOOOOOO LED BAR GRAPH METER Switch OUTPUT MAIN AUX Button LIMITER OUTPUT OUTPUT SWITCH VOLUME VOLUME KNOB KNOB Page 18 of 32 Jumper Options Changing Jumper Settings To change a jumper setting remove the ten screws secured to the top of the mixer After removing the top of the mixer locate the jumper to be changed by referring to the drawing on page 18 Jumpers are included from the factory in positions J2 J17 J18 J21 and J22 Warning Disconnect AC Power before opening case Bar Graph Options The mixer s meter can be configured to meter the output of either the main or auxiliary bus In addition the bar graph can be configured to register either the peak or average level of the audio signal J22 J23 The LED Bar Graph Output Meter can be set to register either the main or auxiliary bus output audio signal The choices are J22 installed The Bar Graph meters the main bus output This is the factory default J23 installed The Bar Graph meters the auxiliary bus outpu
4. the ground loop or other cause is not in the mixer but in the devices after it in the audio path or in the connection between the mixer and following equipment If the hum disappears then the cause is either in the mixer or in one of the inputs to the mixer Turn each of the volume controls both the individual input channels and the two buses down independently to deter mine which one is the source of the hum Check for unbalanced connections use balanced connections if possible For all unbalanced connections try disconnecting the signal line ground to eliminate multiple ground paths Page 24 of 32 Glossary Auxiliary Input Accepts only a balanced line level input unlike the 8 channels the auxil iary input has no volume control Compression Ratio The ratio of the output level above the threshold level to the input level above the threshold Compression Threshold The volume level in dB which is set as the optimum device operating level and above which the Compressor Limiter begins to operate Compressor A special type of limiting device which controls the total volume level of a signal by compressing the part of the signal which exceeds a predetermined threshold The threshold can be varied Gain Trim Control Gain is the ratio between the input and output signal levels Trim is the adjustment of the gain of the input stage to offset the differences between input signal levels Ground Loop A condition whi
5. Mic fr The Volume Control 2 on the front panel controls how much of the gain is routed to the main output stage The front panel controls should optimally operate between the 9 and 2 o clock position when gain structure is correct see example on page 14 1 A Low 1 Cut BUS M A BUS The Main Output Volume Control Knob 3 on the front panel controls the mixer s final amplifier stage to the master output This control should optimally operate between the 9 and 2 o clock positions when gain structure is correct With all channels operating the main output meter should show a signal output range between 0 and 6VU Adjust the main output control accordingly If the output occasionally peaks in the range of 6 and 12 VU activate the Compressor Limiter see page 17 Threshold Ratio V 6 3 Limit MAIN 18 1 12 50 Oo The amplifier for the loudspeakers should be the final control for establishing volume levels Note The channel Input Gain Trim Controls are factory preset to produce a 0 dBy sig nal level at the master output when the front panel volume controls are set at the 2 o clock position This setting is optimal with most input devices Page 13 of 32 Troubleshooting Gain Structure If the procedure followed to this point does not give satisfactory results follow the appropriate adjustment sequence below If channel clipping occurs I
6. button to turn unit on in position push again to turn unit off out position Page 8 of 32 MES ES ES 18VCT AC Ground AUX OUT MAIN AUXIN 77 8 O O ese O eee G G G b Mic H CAMB CAMBPRO Rear Panel 1 Ground Connection on Rear Panel 4 3 00 ooo oo T OO FiO OF TT 00 T o oj o o o G Power Phantom Access to ground 2 AC Power Jack Mixer power supply input Accepts a 4 pin DIN connection from a 18V CT 1 5 Amp trans former uses approximately 500 mA 3 Phantom Power Switch When activated supplies 30V DC power to all inputs set to mic level 4 Auxiliary Bus Output Balanced line level connection to auxiliary output bus 5 Main Output Microphone Line Switch Selects main output to be either MIC 50 dBu or line 0 dBu level 6 Main Bus Output Balanced connection to main output bus 7 Auxiliary Input Balanced buffered uncontrolled line level terminals for additional ninth input connection directly to the summing buses selected by internal jumpers The factory default is both jumpers installed For details see page 19 8 Input Gain Trim Control Screw Adjusts gain of input stage over a range of 40 dB 9 Input Pad Microphone Line Switch Selects either MIC 50 dBu or line 0 dBu le
7. systems etc and is used primarily with mic level input It is particularly effective when handheld mics are used Phantom Power If a condenser microphone s is not independently powered press Phantom Power Switch 2 to the on position 18VCT AC Ground C Li O OS Power Phantom b The phantom power switch will power condenser capacitor mics through the mic cable Depressing the button simultaneously applies phantom power to all channels set to mic level Page 16 of 32 Compressor Limiter CAM8PRO only T The Compressor Limiter 1 is a dynamic range controller that be used to compen sate for signals that may sound unnatural or cause audible distortion This is indicated by the LED Bar Graph Output Meter 3 occasionally exceeding 12 VU red Note The Compressor Limiter is only available on the CAM8PRO and only affects the main channel A Compressor is used to slightly reduce the dynamic range of a signal This effect is perceived to quiet loud sounds and boost quiet sounds A compressor smooths transients A Limiter is used to prevent a signal from exceeding a certain level This function guards against amplifier or recording level overloads The Compressor Limiter is activated by press ing the Main Output Compressor Limiter Switch This dynamic controller allows for compression and limiting functions by controlling threshold and ratio The Threshold Control 2 is a scre
8. A 2 Channel Volume Control Knob one per channel xm Controls the volume of the channel input to any and all outputs simultaneously 3 Low Cut Switch Helps eliminate low frequency noise 150 Hz 12dB octave 4 Main Output Volume Control Knob Controls the output signal volume of the main bus 5 Auxiliary Output Volume Control Knob Controls the output signal volume of the auxiliary bus output and to the headphones head phones on CAM8PRO only 6 Power Indicator LED LED displays mixer s powered state Lit when power is on Not lit when power is off 7 Power Switch Button Push button to turn unit on in position push again to turn unit off out position Page 7 of 32 TIT C O Threshold Ratio 20 100 Eo JO JO JO JO JO se 0 89 0 Go _ as as it nS pares m ws Oe ae AUX Headphone Power ee CAMS8PRO Front Panel 1 Main Auxiliary Bus Selector one per channel A 4 position switch which selects destination of channel input Input can be routed to the main bus M up A down b the auxiliary bus M down A up shown at right c both the main and auxiliary buses both up or d neither bus MA both down Bus 2 Channel Volume Control Knob one per channel Controls the volume of the channel input to any and all outputs simultaneously 3 Low Cut Switch Helps eliminate low frequency noise 150 Hz 12 dB octa
9. BOGEN CAMS3 Series Models CAM8 CAM8PRO Installation and Use Manual 2000 Bogen Communications Inc All rights reserved 54 2034 01C 0508 2000 Bogen Communications Inc All Rights Reserved Notice Every effort was made to ensure that the information in this guide was complete and accurate at the time of printing However this information is subject to change Important Safety Information Always follow these basic safety precautions when installing and using the unit 1 Read all instructions before installing or operating the unit 2 Follow all warnings and instructions marked on the product 3 DO NOT block or cover the ventilation slots and openings They prevent the product from overheating DO NOT place the product in a separate enclosure or cabinet unless proper ventilation is provided 4 Never spill liquid on the product or drop objects into the ventilation slots and openings Doing so may result in serious damage to the components 5 Repair or service must be performed by a factory authorized repair facility 6 The product is provided with a UL CSA approved 3 wire ground type plug This is a safety feature DO NOT defeat the safety purpose of the grounding type plug DO NOT 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 wit
10. To mount CAM8 and CAM8PRO to a 19 rack lift the unit up to the front of the rack and secure it to the front of the rack with the necessary screws not included with this unit A Turn all mixer Volume Control Knobs Channel s 1 Main 2 and Auxiliary 3 to zero I 1 1 Co AERO us ER Threshold e O FORO 0 100 Oo Oo 0 o 00000000 o Q 3 0 43 6 e 18 12 6 412 CO oa mM Limit MAIN AUX Headphone Power C Turn amplifier s volume controls to the 7 o clock position B Connect Inputs Connect lead into desired pluggable terminal strip 6 on rear panel Press Input Pad Microphone Line Switch 5 to appropriate position in for line input or out for MIC input Note that the input from some mics is actually does to line level 20 dB and for such mics the switch should be at Line Set switch for all unused channels at Line level The Auxiliary Input 4 is Line level only i AUXIN 2 8 Trim Gree Lieb G line F G Mic Mic m id Page 11 of 32 C Connect Output Make a connection between Main Bus Output Terminals 3 and an input jack of an amplifier Press Main Output Microphone Line Switch 2 to appropri ate position for line level output 0 dBy or out for mic level 50 dBu output 1 T A
11. UX OUT MAIN es G 5008 G dB b If desired also connect Auxiliary Bus Output Terminals 1 to a second destination device The auxiliary output is line level only D Connect mixer power supply to an AC power outlet and to the AC Power Jack 4 located on far left side of rear panel T 18VCT AC Ground XO Power E Power up mixer Press Power Switch 8 to in position Power Indicator LED 7 will be lit if mixer is powered Set Main Output Volume Control Knob 5 to 2 o clock If auxiliary output is desired also set Auxiliary Output Volume Control Knob 6 to 2 o clock Power up amplifier BOGEN CAM8PRO Threshold Ratio 20 420 0 7 100 0 18 12 46 12 Limit MAIN AUX Headphone Power Cy be Note Mixer will produce signal transients on power up and power down Always turn the mixer on first before turning on the amplifier and always turn the amplifier off first before turning off the mixer S oO G 20 Page 12 of 32 The primary goal when establishing the gain settings of the mixers is to have each channel operating at the maximum gain without clipping while leaving adequate headroom on the vol ume control knob The channel Input Gain Trim Control 1 on the rear panel of the mixers directly controls the microphone pre amplifier gain available at each channel dol Trim 6 Oo Line Gay
12. ch can occur when several ground pathways exist between two or more devices and which can cause hum in the audio signal Jumper A short length of conductor used to connect pins electrically Limiter A device that severely at rates greater than 10 1 restricts the upper dynamic range of a signal by regulating the rate of increase of an input signal s amplitude so that it will not exceed a predetermined threshold Line Microphone Level The two signal level ranges at which the mixer accepts input MIC level is usually 50 dBy and Line level is usually 4 dB Low Cut Switch Removes the lower frequency lt 150 Hz components which cause rum ble from a signal Phantom Power A method of powering condenser microphones by sending DC current over the same MIC cable that carries the audio signal Called Phantom as there is no visi ble power cord and the voltage is not perceptible in the audio signal Pot Potentiometer RCA Connector An unbalanced line level connection also known as phono connector Summing Junction The point in the CAM8 Series circuitry where the audio signals are mixed Page 25 of 32 Technical Information SPECIFICATIONS Signal to Noise MIC Pre amp Equivalent Input Noise Maximum Voltage Gain Frequency Response Crosstalk adjacent channels Phantom Power INPUTS 1 8 Input Impedance Nominal Source Impedance Line Pad Input Gain Trim Range Nominal Level input trim pot mid
13. e been subjected to abuse misuse improper storage neglect accident improper installation or have been modified or repaired or altered in any manner whatsoever 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 PUR CHASER S SOLE AND EXCLUSIVE REMEDY BOGEN MAKES NO OTHER WARRANTIES OF ANY KIND EITHER EXPRESS OR IMPLIED AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED AND EXCLUDED TO THE MAXIMUM EXTENT ALLOWABLE BY LAW Bogen s liability arising out of the manufacture sale or supplying of products or their use or dispo sition 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 including 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 Some states do not allow the exclusion or limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you This warranty gives you specific legal rights and you may also have other rights which vary from state to state Products that are out of warranty will also be repaired by the Bogen Factory Service Department same addres
14. ed the front panel AUX volume knob controls only the headphone level J2 installed AUX output gain is controlled by AUX volume knob on front panel The 1 4 inch Headphone amp is also controlled by the AUX volume knob but not independently of the AUX output Note Never install jumpers in both positions 1 and J2 If both J1 and J2 jumpers are installed then gain is defeated Page 19 of 32 8 mixers can be linked in several ways The two principal ways of linking the mix ers are Simple and Complex Linking Simple Linking is the expansion to more than 8 inputs by connecting two 8 channel mix ers via the auxiliary bus Simple Linking is the daisy chaining of multiple mixers to expand the number of inputs routed to a single output Inputs can be multiplied in increments of 8 by adding mixers to the chain The number of mixers that can be daisy chained is limited only by the accumulation of noise Typically 6 mixers with 48 inputs on can be used without excessive degradation This gives you the equivalent of 48 inputs MIC inputs Each doubling of inputs reduces the system s noise floor by 6 dB An example of Simple Linking is shown on page 21 Complex Linking allows the use of multiple 8X2 channel mixers as a single 2 output mixer For example two mixers can be linked as a 16X2 channel mixer stack in which there are two separate output mixes with full control over distribution of the inputs to the two output
15. esponsible carrier Domestic and International Listings UL and CSA Listed Page 2 of 32 Contents INTRODUCTION Safety NSC NS RU E 5 QUICK START 222 222 RU Rd et E Re AE 6 PANEL DESERIPTIONS rci te tke ERU SERE NEN WR ER HERES Ee ode eek alien ea 7 9 GAMB Erorit anne ann Renee eek 7 CAM8PRO FrontiPanel Rn RR 8 CAM8 CAMBPRO Rear Panel iii ee edente 9 imita aee DS INSTALLATION ionian nannt t t Rasa Tee is este ivit etre estes antes SE EAS OPERATION a2 titt idee e Wette Rt oat d Troubleshooting Gain Structure Recommended Input Wiring Methods DINI DICES Compressor Limiter Special Features Activation Jumper Options i 5 257 230 ot an sn abe LE Ruin Avi ECL EDU PLA DM DEC E Simple Linking I I AC POWER Connection sel th Technical Support 1 2 2 2 EEE LI a aeo totos pe doter edere d AEG TROUBLESHOOTING TIPS rore UE ann HE EI ni RIDE ee DERI GLOSSARY ROR ndseadendscadosisendesaesndscauhdecas TECHNICAL INFORMATION tette teen teretes tnr tte aa Bene nebenan Auxiliary Eireuits coeno tee bd oae n Uf aida t ee t UALS UE o St dote Block Diagramm Cie er oH or nen en adit eva
16. f the signal is clipping or producing audible distortion the gain is too high Reduce the Input Gain Trim Control rear panel by turning it counterclockwise until clipping does not occur Also make sure that the new setting of the gain control offers a usable control range between the 9 o clock and 2 o clock positions on the front panel volume control knob If channel volume is too low If a channel must be set above the 2 o clock position to provide adequate volume the input gain setting is too low Turn the volume control knob to the 1 o clock position and increase the input gain by turning the input gain trim control clockwise until clipping occurs or VU meter is over 0 VU Then adjust the gain to a setting just below the clipping level If channel volume is too high If a channel is not clipping but must be set below the 9 o clock position to achieve the prop er volume level the input gain control setting is too high Reduce the Input Gain Trim Control by turning it counterclockwise Set the volume control knob to the 9 o clock position and continue to adjust the gain control until the desired volume level is achieved Range for optimal volume control operation settings indicator positions 12 o clock 11 o clock o clock 10 o clock 2 o clock 9 o clock 3 o clock 8 o clock 4 o clock 7 o clock 5 o clock Page 14 of 32 Recommended Input Wiring Methods These are the best ways to c
17. hin 6 feet of a grounded outlet receptacle 9 DO NOT install telephone wiring during a lightning storm 10 DO NOT install telephone jacks in a wet location unless the jack is specifically designed for wet locations 11 Never touch uninsulated wires or terminals unless the line has been disconnected at the paging or controller interface 12 Use caution when installing or modifying paging or control lines Maintenance amp Service Caution There are no user serviceable parts within the unit Have all inter nal servicing performed by a qualified technician The warranty will become void if repairs are made by other than the Bogen Service Department or an authorized service agency Our Applications Engineering Department is available to help you troubleshoot problems with your Bogen equipment Engineers are available from 8 30 AM to 6 00 PM Eastern Standard Time Phone 1 800 999 2809 Service can be obtained from our factory service department No merchandise may be returned for repair without prior written authorization Please contact our factory service department at 1 800 999 2809 for a RA number Only mer chandise specified in the return authorization form can be returned to obtain warranty or non warranty repair When shipping your unit pack your system well using the original shipping carton or a similar container and filler material to prevent damage in transit Send the unit fully insured and pre paid via UPS or other r
18. n installing and using electrical equipment see inside front cover To protect both the users and the equipment pay particular attention to Grounding Make sure both the mixer and the devices connected to it are properly grounded s Power Supply Use only the power supply provided or one that meets the manufacturer s specifications b Cords and Cables Route all cords and cables so that they will not be tripping hazards or subject to damage from being run over or pinched that could cause them to become shock hazards Pay particular attention to cords at plugs convenience receptacles and the point where they enter the mixer Page 5 of 32 Quick Start 1 Unpack and Connect See page 11 for more details A Check mixer for shipping damage Rack Mounting To mount the CAM8 and CAM8PRO to a 19 rack lift the unit up to the front of the rack and secure it to the front of the rack with the necessary screws not included with this unit B If special features see page 18 are to be used they must be programmed before mixer is mounted C Turn off both mixer and amplifier and turn all volume controls to zero D Connect inputs and set the input pad switch for each channel at the appropriate level either MIC or line Make sure that the bus selector is set for Main Out E Connect output s and set the main output pad switch at the appropriate level either MIC or line Auxiliary output is line level only 2 Power a
19. nd Set Up See pages 11 15 for details A Connect mixer AC power supply B Turn volume controls down then power up mixer and amplifier Note Mixer will produce signal transients on power up and power down Always turn the mixer on first before turning on the amplifier and always turn the amplifier off first before turning off the mixer C Adjust Main AUX out controls to the 2 o clock position Then turn amp up to normal level while performing audio test D Adjust input gain trim control for each channel to get a meter reading within the green area E Adjust individual channel volume controls to the 2 o clock position 3 Fine Tuning See page 16 for details A In the event of excessive bass press Low Cut filter switch es on B If condenser mics are used press phantom power switch on turns phantom power on for all inputs set to MIC position C CAM8PRO only In the event of occasional excessive output level press Compressor Limiter switch on Page 6 of 32 li BUS 0 0 JO BUS du BUS Tut BUS Gut BUS m Bus MAIN AUX ti CAMS Front Panel 1 Main Auxiliary Bus Selector one per channel A 4 position switch which selects destination of channel input Input can be routed to a the main bus M up A down b the auxiliary bus M down A up shown at right c both the main and auxiliary bus both up or d neither bus both down M
20. onnect sources to the mixer The mixer input is always balanced From the drawings below choose the wiring method for your input device either balanced or unbalanced Balanced Source to Balanced Input Method 1 Normal Shown below is the normal wiring method for a balanced source device It has 6 dB gain and excellent ground current and noise rejection Balanced Source to Balanced Input Method 2 If the method above does not work in your application use the wiring shown below This method can solve certain ground loop problems It has 6 dB gain and good noise and ground loop rejection Unbalanced Source to Balanced Input Method 1 For an unbalanced source device the drawing below shows the best wiring method Because of the design of the mixer this wiring provides a slight 6 dB boost and moderate noise and ground loop rejection Unbalanced Source to Balanced Input Method 2 For an unbalanced source device the drawing below shows an alternative wiring method Because the grounding of the minus input is not to the mixer ground this method does not provide the 6 dB boost Ground current and noise rejection is good Page 15 of 32 Fine Tuning Low Cut Switch To remove excessive bass from an individual channel press the Low Cut Switch 1 for that channel CO This feature helps eliminate low frequency noise signals of 150 Hz and below such as back ground rumble from ventilation
21. range Minimum Level input trim pot max gain Maximum Level input trim pot min gain plus 20 dB headroom AUXILIARY INPUT Input Impedance Nominal Input Level OUTPUTS Output Impedance Nominal Load Impedance Nominal Level Maximum Level Main Output MIC Pad Page 26 of 32 Ref 26 dBV 54 dB sys gain 90 dB 129 dB 150 ohm 20 Hz to 20 kHz 96 dB 1 dB from 20 Hz to 20 kHz 0 3 dB from 10 Hz to 30 kHz better than 90 dB 30V DC 3 5k ohm Mic 15k ohm Line 150 ohm 50 dB 40 dB 50 dBu line pad off 0 dBu line pad on 70 dBu line pad off 20 dBu line pad on 30 dBu line pad off 20 dBu line pad on 20k ohm balanced 0 dBm 220 ohm unbalanced 440 ohm balanced 2600 ohm 4 dBu RMS 26 dBu RMS Balanced 50 dB Auxiliary Circuits Bar Graph Compressor Limiter Adjustment Range Compressor Limiter Ratio Adjustment Range Low CutFilter Power Requirements Dimensions Shipping Weights CAM8 CAM8PRO Page 27 of 32 18 12 6 3 0 3 6 12 VU 0 VU 4 dB Average or Peak reading Peak reading per DIN spec 45406 1 7 ms attack 650 ms decay 20 dB to 40 dB 0 to 100 12 dB octave at 150 Hz 18V AC center tapped 21V AC 120V AC 60 Hz 18 24V DC 450 mA 19 W x 1 3 4 Hx 6 D 10 Ib 10 Ib Block Diagram SWVD AHL OL Aldd V LON
22. s Among other applications this feature can be used to implement the so called mix minus technique in which no microphone drives the output nearest itself An example of Complex Linking is shown on page 22 There are other techniques for linking not shown here If you have questions regarding a linked application not shown please contact Bogen s Applications Engineering department Page 20 of 32 Simple Linking Aux Out Mixer 1 Main Out Aux In Simple linking or daisy chaining allows the expansion of mixer inputs in multiples of 8 inputs by chaining together multiple mixers with auxiliary buses To preserve certain mixer features this must be done in the way shown below Follow these steps see page 18 for jumper loca tions 1 For each mixer remove the jumper from J2 and place it on J1 This causes the Auxiliary Out level to be set by an internal pot fixing the linked gain structure The external pot only controls the headphone out level 2 In the last mixer in the chain remove the jumper from J18 Leave the jumper in place on J17 This routes the AUX In to the Main output preserving the Compressor Limiter feature 3 All other mixers in the chain should have jumper 18 in place and J17 removed 4 Connect each mixer s AUX Out terminals with the AUX In terminals of the next mixer in the chain 5 Take the summed daisy chain output from the Main Out terminals of the last mixer in the daisy chain This m
23. s 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 All returns require a Return Authorization number 8 2004 Page 29 of 32 Page 30 of 32 Page 31 of 32 BOGEN COMMUNICATIONS INC 50 Spring Street Ramsey NJ 07446 Tel 201 934 8500 Fax 201 934 9832 www bogen com
24. t Note The meter will operate only when a jumper is in one of these two positions J20 21 The LED Bar Graph Output Meter can be set to register either the peak or average level of the output audio signal The choices are J20 installed The Bar Graph meter registers the peak level of the audio output J21 installed The Bar Graph registers the average level of the audio output This is the factory default Note The meter will operate only when a jumper is in one of these two positions Bus Routing Options AUX In Jumpers J17 and J18 These jumpers determine the destination of the Auxiliary Input The choices are J17 installed Auxiliary Input is routed to Main Output J18 installed Auxiliary Input is routed to Auxiliary Output J17 and J18 both installed Auxiliary Input is routed to both Main and AUX outputs This is the factory default setting AUX Source Jumpers J1 and J2 These jumpers determine which of two gain controls are used to control the level of the AUX output The choices are J1 installed AUX output gain is controlled by the internal pot AUX Pregain Pot RP23 see page 18 for location The front panel AUX output volume knob continues to independently control the gain of the headphone amplifier jack on the front panel This setting is typically used in a linking situation where the output from a mixer must remain fixed since J1 makes the output of that mixer tamper proof from the front panel With J1 install
25. the proper position This is the most likely cause Make sure both the master and channel input controls are turned up 5 Check that the source signal cable s is properly connected and undamaged Adjust Input Gain Trim Control potentiometer s to increase gain If chere is still no sound try changing input source s to different channel s DISTORTED SOUND Turn down the master volume control If distortion persists input channel s gain is the likely cause Check position of all line MIC switches Determine the distorting input channel s by checking them one at a time Decrease gain of input channel s causing distortion by turning the screw on the rear panel EXCESSIVE HISS or HUM Hiss Make sure the volume control knobs for all the unused channels are turned all the way off i e at the 7 o clock position Make sure that all unused input channels have the MIC Line switch in the Line position Make sure the MIC Line switch is in the correct position for both the inputs and the main output Hum MIC lines can easily cause hum Make sure to locate them away from vibration and magnetic field sources motors power supplies and lines and data lines Check MIC lines especially the shield for damage Another common source of hum is a ground loop which can result from connecting two or more powered devices together Turn both the Main and Auxiliary volume controls down If the hum is still present
26. tr ond WARRANTY Page 3 of 32 Introduction CAM8 Series 8 Front View BOGEN CO CAMB ros Eos Eo Eo JO JO O O O D oO CO s BUS Gut BUS Gu BUS Gu BUS du BUS Cu BUS Gu BUS E MAIN AUX Power C CAM8PRO Front View CO CO Eo e NOS T Nod VO o 0 0 0 Sto 20000000 oQ Bus Gut BUS BUS Cu Bs 4 Cu mis 5 cw sus 6 cu ms 7 tu ms 8 Um Limit MAIN AUX Headphone Power CAMB8 Series Rear View 18VCT AC Trim Trim Trim Trim Trim Trim Trim Trim Ground AUX OUT MAIN AUX IN 8 7 6 5 4 3 2 1 e ees e00 O bood O ko O leec bod O bood O boo O boo foo G F G Leb G Lieb G Leb G G Lieb G Lieb G Leb G Lieb G Power Phantom b Mic lh Mic b Mic J Mic Mic fx Mic is Mic f Mic lh This manual covers installation for both the CAM8 and CAM8PRO They were manufactured to ensure the highest quality audio signal production and control while still incorporating sim ple to use features This manual is designed to familiarize you with the features of your new Bogen CAM8 Series mixer and to guide you through its installation and operation Page 4 of 32 Safety Instructions Bogen s CAM8 Series mixers are electrical equipment so take all the precautions usually taken whe
27. ust be the mixer with J17 in place from step 2 6 All mixers except the last mixer in the chain 1 in the drawing below must have all its front panel M A switches in the A position to route its inputs to the auxiliary bus The posi tion of jumpers J17 and J18 in the first mixer 4 in the drawing below do not matter and can be left undisturbed You should now have a daisy chain configured as shown in the drawing below Note that the position of J17 and J18 are shown within the drawing of each mixer in the chain except mixer 4 in which the jumper position is immaterial Mixer 2 Mixer 3 Mixer 4 Aux Out MainOut In Aux Out MainOut Aux In Aux Out MainOut Aux In Lao Page 21 of 32 Complex Linking Complex Linking allows multiple mixers to produce two separate mixes from the same set of inputs The most common complex linking application is shown below This method can also be used to implement a mix minus application This method CAM8PRO only creates two separate mixes Both destinations are routed through the Compressor Limiter since both destinations are driven by Main outputs Destination 1 receives inputs from Mixer 1 with Main Auxiliary bus selector set to Main and inputs from Mixer 2 with Main Auxiliary bus selector set to AUX Destination 2 receives inputs from Mixer 1 with Main AUX set to AUX and inputs from Mixer 2 with Main AUX set to Main To create this complex mix take the following steps 1
28. ve 4 Main Output Compressor Limiter Switch and LED Note Works only on main bus Reduces distortion of the main output due to clipping by controlling its dynamic range When the LED red is lit the Compressor Limiter is on The brighter the LED the more the signal is being compressed 5 Main Output Volume Control Knob Controls the output signal volume of the main bus 6 LED Bar Graph Output Meter Displays output signal level in decibels ranging from 18 green to 12 red VU 0 VU 4 dBm This meter can be set to indicate the signal level of either the main or aux iliary bus and to indicate either the average or peak signal See page 19 for details 7 Threshold Control Screw pot adjustment sets the signal level 40 to 20 VU factory setting is 0 VU at which the Compressor Limiter becomes active 8 Ratio Control Screw pot adjustment sets the amount of compression 0 100726 factory setting is 100 of the signal above the threshold 9 Auxiliary Output Volume Control Knob Controls the output signal volume of the auxiliary bus output and to the headphones head phones on CAM8PRO only There is no connection between this bus and the Compressor Limiter 10 Headphone Jack A 1 4 inch diameter TRS mono only jack for the connection of headphones Only monitors AUX bus 11 Power Indicator LED LED displays mixer s powered state Lit when power is on Not lit when power is off 12 Power Switch Button Push
29. vel for corresponding input connection 10 Input Balanced input connection pluggable terminal strip Page 9 of 32 Helpful Hints Electrical equipment operates best in a clean dry well ventilated environment free of vibra tion and electromagnetic fields The following are some guidelines to achieve optimal per formance Avoid placing the mixer and cables near heat sources Be particularly aware of other audio equipment such as amplifiers which can produce a great deal of heat when operating To minimize hum in the system avoid placing the mixer and cables near radio frequency devices and other electromagnetic field sources such as Fluorescent lights Electrical motors SCR dimmers AC power lines etc Note Always use 2 conductor shielded cable to reduce EMI or RF interference to the Line MIC inputs Keep the mixer and other equipment clean and free of dust by wiping occasionally with a soft damp cloth Protect the mixer from electrical damage by disconnecting it from the power source when ever it will be unused for a week or longer The Bogen mixer is easy to install and adjust The only tools needed are 1 Slotted screwdriver 2 Phillips head screwdriver Page 10 of 32 Installation Note Take the mixer out of the box and inspect for shipping damage If there is obvious physical damage to the outside of the mixer contact the supplier of the mixer before you begin installation Rack Mounting
30. w potentiometer that sets what signal level will acti vate the Compressor Limiter It has a range of 40 to 20 dB The Ratio Control 4 is a screw potentiometer that sets the compression ratio that will be applied when the signal exceeds the threshold It has a range from 0 to 100 A Compressor becomes a Limiter when the compression ratio is 10 1 or greater The factory setting for the threshold is 0 VU 4 dB but this is variable from 40 dB to 20 dB and can be changed by adjusting the Threshold Control Likewise the factory setting for the compression ratio is 100 at this maximum setting the circuit performs the limiter func tion but can be set to between 0 and 100 by adjusting the Ratio Control Note The LED Bar Graph Output Meter can be used to view the effects of adjusting the Compressor Limiter controls Turn off power amplifiers while performing these adjustments Warning If the amplifier speaker combination being used is such that the speaker s can be overdriven to failure always operate the mixer with the Output Limit Switch in the on position and the ratio should be set at 100 Page 17 of 32 Special Features Activation The CAM8 Series mixers have several built in features which are easily activated by making adjustments inside the mixer chassis Changing the selection of all built in features requires only the correct placement of internal jumpers or varying the settings of an internal poten tiometer
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