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1、CAM8PRO Mix er Installation and Use Manual 2011 Bogen Communications, Inc. All rights reserved. 54-2034-01D 1207 RadioFans.CN 收音机爱 好者资料库 Notice Every effort was made to ensure that the information in this guide was complete and accurate at the time of print- ing. However, this information is subject
2、 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 o
3、penings. 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 component
4、s. 5.Repair or service must be performed by a factory authorized repair facility. 6.DO NOT use the product near water or in a wet or damp place (such as a wet basement). 7.DO NOT use extension cords. The product must be installed within 6 feet of a grounded outlet receptacle. 8.DO NOT install teleph
5、one wiring during a lightning storm. 9.DO NOT install telephone jacks in a wet location unless the jack is specifically designed for wet locations. 10. Never touch uninsulated wires or terminals, unless the line has been disconnected at the paging or controller interface. 11. Use caution when instal
6、ling or modifying paging or control lines. Maintenance b) the auxiliary bus (M-down, A-up-shown at right); c) both the main and auxiliary buses (both up); or d) neither bus (both down). 2. Channel Volume Control Knob (one per channel) Controls the volume of the channel input to any and all outputs s
7、imultaneously. 3. Low Cut Switch Helps eliminate low frequency noise (100 Hz 18 dB/octave). 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 Compress
8、or/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
9、 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 18 for details.) 7. Threshold Control Screw-pot adjustment sets the signal level (-20 to +20 VU; factory setting is 0 VU) at which the Compressor/Limiter
10、becomes active. 8. Ratio Control Screw-pot adjustment sets the amount of compression (0-100%; 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. (There is no connecti
11、on 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 moni- tors AUX bus.) 11. Power Indicator LED LED displays mixers powered state. Lit when power is on. Not lit when power is off. 12. Power Switch Button
12、Push button to turn unit on (“in” position); push again to turn unit off (“out” position). Page 7 M A Bus + - Front Panel Descriptions Power Ratio 0100 AUX 0+3+12+6 MAIN -12-18-6-3 Threshold On 8 Cut Low Off - + M.A BUS Low Cut7 Limit Headphone - + - + Low Cut6BUS M.A - + 5 M.A BUSCut Low Cut Low +
13、- 4 M.A BUS Low Cut3 - + Low CutBUS M.A 2 - + - + Cut Low 1 M.A BUSBUS M.A BUS M.A CAM8PRO 25789 13461011 12 CAM8PRO Rear Panel 1. Ground Connection on Rear Panel Access to ground. 2. AC Power Jack Mixer power supply input. Accepts a 4-pin DIN connection from a 17V CT 1.5 Amp transformer. 3. Phantom
14、 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 dB) or line (0 dB) level. 6. Main Bus Output Balanced
15、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. (See page 18 for details.) 8. Input Gain/Trim Co
16、ntrol Screw Adjusts gain of input stage, over a range of 40 dB. 9. Input Pad Microphone/Line Switch Selects either MIC (-50 dB) or line (0 dB) level for corresponding input connection. 10. Input Balanced input connection (pluggable terminal strip). + + + + - - - -G + + + + G- - - - + + + + - - - -G
17、+ + + + - - - -G + + + + - - - - G + + + + - - - - G + + + + - - - - G + + + + - - - - G - - G - - + + + + + + + + - - - - G+-+-+-+-G 12 Trim Mic Line 34 Mic Line TrimTrim Mic Line 5 Trim Mic Line 6 Mic Line Trim 7 Trim Mic Line 8 Trim Mic Line MAIN 0dB -50dB Off On AUX OUTAUX IN AC Power Ground Pha
18、ntom 17VCT Mic Line Trim 2 1 35910 4678 Page 8 Rear Panel Descriptions No connect Center ACAC Helpful Hints Electrical equipment operates best in a clean, dry, well-ventilated environment free of vibration and electromagnetic fields. The following are some guidelines to achieve optimal performance.
19、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 fre- quency devices and other electromagnetic
20、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.
21、Protect the mixer from electrical damage by disconnecting it from the power source whenever 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 9 Installation Note: Take the mixer o
22、ut 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: To mount the CAM8PRO to a 19” rack, lift the unit up to the front of the rack and secure it to the front of
23、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. Turn amplifier(s) volume controls to the 7 oclock position. B. Connect Inputs. Connect lead into desired pluggable terminal strip (6) on rear
24、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 close to line level (-20 dB) and for such mics the switch should be at “Line.” Set switch for all unused chan- nels at Line level. The
25、 Auxiliary Input (4) is Line level only. Page 10 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: “in” for line-level output (0 dB) or “out” for mic-level (-50 dB) out
26、put. 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). E. Power up mixer: Press Power Switch (
27、8) to “in” position. Power Indicator LED (7) will be lit if mixer is powered. Set Main Output Volume Control Knob (5) to 2 oclock. If auxiliary output is desired, also set Auxiliary Output Volume Control Knob (6) to 2 oclock. Power up amplifier. Note: Mixer will produce signal transients on power up
28、 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. Page 11 + + + + - - - - G+-+-+-+-G MAIN 0dB -50dB Off On AUX OUT Phantom 13 2 Operation The primary goal when establishing the gain settings of the mi
29、xers is to have each channel operating at the maximum gain without clipping, while leaving adequate headroom on the volume 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. The Volume C
30、ontrol (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 oclock position when gain structure is correct (see example on page 13). The Main Output Volume Control Knob (3) on the front panel co
31、ntrols the mixers final amplifier stage to the master output. This control should optimally operate between the 9 and 2 oclock positions when gain structure is correct. With all channels operating, the main output meter should show a signal output range between 0 and +6 VU. Adjust the main output co
32、ntrol accordingly. If the output occasion- ally peaks in the range of +6 and +12 VU, activate the Compressor/Limiter (see page 16). 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
33、a 0 dB signal level at the master output when the front panel volume controls are set at the 2 oclock position. This setting is optimal with most input devices. + + + + - - - - G 6 Mic Line Trim 1 - + - + Cut Low 1 M.A BUSBUS M.A 2 Page 12 Troubleshooting Gain Structure If the procedure followed to
34、this point does not give satisfactory results, follow the appro- priate adjustment sequence below: If channel clipping occurs If 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
35、 does not occur. Also make sure that the new setting of the gain control offers a usable control range between the 9 oclock and 2 oclock positions on the front panel volume control knob. If channel volume is too low If a channel must be set above the 2 oclock position to provide adequate volume, the
36、 input gain setting is too low. Turn the volume control knob to the 1 oclock 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 to
37、o high If a channel is not clipping but must be set below the 9 oclock position to achieve the proper 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 oclock position and continue to adju
38、st the gain control until the desired volume level is achieved. Page 13 Range for optimal volume control operation settings (indicator positions). Recommended Input Wiring Methods These are the best ways to connect sources to the mixer. The mixer input is always balanced. From the drawings below cho
39、ose 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 Inp
40、ut - 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
41、 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. Be
42、cause 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. - + - + - Gnd Balanced SourceG - + - + - Gnd Balanced SourceNo connectG - + - + + Gnd Unbalanced Source G - + - + + Gnd Unbalanced Source G Pag
43、e 14 Fine Tuning Low Cut Switch To remove excessive bass from an individual channel, press the Low Cut Switch (1) for that channel. This feature helps eliminate low frequency noise (signals of 100 Hz and below, such as background rumble from ventilation systems, etc.) and is used primarily with mic-
44、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. The phantom power switch will power condenser (capacitor) mics through the mic cable. Depressing the bu
45、tton simultaneously applies phantom power to all channels set to mic-level. - + - + Cut Low 1 M.A BUSBUS M.A 1 Page 15 Compressor/Limiter The Compressor/Limiter (1) is a dynamic range controller that can be used to compen- sate for signals that may sound unnatural or cause audible distortion. This i
46、s indicated by the LED Bar Graph Output Meter (3) occasionally exceeding +12 VU (red). Note: The Compressor/Limiter only affects the main channel. A Compressor is used to slightly reduce the dynamic range of a signal. This effect is per- ceived to quiet loud sounds and boost quiet sounds. A compress
47、or 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 pressing the Main Output Compressor/Limiter Switch. This dynamic controller allows for compression
48、and limiting functions by controlling threshold and ratio. The Threshold Control (2) is a screw potentiometer that sets what signal level will acti- vate the Compressor/Limiter. It has a range of -20 to +20 dB. The Ratio Control (4) is a screw potentiometer that sets the compression ratio that will
49、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 -20 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 function), but can be set to between 0 and 100% by adjusting the Ratio Control. Note: The LED Bar Graph Output Meter can be use
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