CAM8PRO Mixer Installation and Use Manual © 2011 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.
Contents INTRODUCTION ......................................................................................................................................................4 Safety Instructions ........................................................................................................................................5 QUICK START ..........................................................................................................................................................
Introduction CAM8PRO This manual covers installation of the CAM8PRO. It was manufactured to ensure the highest quality audio signal production and control, while still incorporating simple-to-use features. This manual is designed to familiarize you with the features of your new Bogen CAM8PRO mixer and to guide you through its installation and operation.
Safety Instructions Bogenʼs CAM8PRO mixer is electrical equipment, so take all the precautions usually taken when 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. • Power Supply - Use only the power supply provided or one that meets the manufacturerʼs specifications.
Quick Start 1. Unpack and Connect (See page 10 for more details). A. Check mixer for shipping damage. 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 the rack with the necessary screws (not included with this unit). B. If special features (see page 17) are to be used, they must be set before the mixer is mounted. C. Turn off both mixer and amplifier and turn all volume controls to zero. D.
Front Panel Descriptions 2 5 7 8 Threshold + + - + - M.A BUS 1 1 Low Cut + - M.A BUS 2 Low Cut + - M.A BUS 3 Low Cut + - M.A BUS 4 Low Cut + - M.A BUS 5 Low Cut 6 Low Cut - M.A BUS 7 Low Cut M.A BUS 8 Low Cut 3 Limit -18 -12 -6 -3 MAIN 4 CAM8PRO Ratio 0 On Off + - M.A BUS 9 100 0 +3 +6 +12 AUX 6 Headphone 10 Power 11 12 CAM8PRO Front Panel 1.
Rear Panel Descriptions 4 6 7 AUX OUT MAIN AUX IN 1 Ground 17VCT AC 8 Trim Trim 8 Trim 7 Trim 6 Trim 5 Trim 4 Trim 3 Trim 2 1 On Off Power Phantom 2 3 G - + -50dB 0dB G - + G - + Line Mic G - + Line Mic G 5 - + Line Mic 9 G - + Line Mic G - + Line Mic G - + Line Mic G - + Line Mic G - + Line Mic G - + 10 CAM8PRO Rear Panel 1. Ground Connection on Rear Panel Access to ground. 2. AC Power Jack Mixer power supply input.
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. 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.
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: 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 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.
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 appropriate position: “in” for line-level output (0 dBμ) or “out” for mic-level (-50 dBμ) output. 1 3 AUX OUT MAIN On Off Phantom G - + -50dB 0dB G - + 2 If desired, also connect Auxiliary Bus Output Terminals (1) to a second destination device. The auxiliary output is line-level only. D.
Operation 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 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. 1 Trim 6 Line Mic G - + The Volume Control (2) on the front panel controls how much of the gain is routed to the main output stage.
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 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 does not occur.
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 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.
Fine Tuning Low Cut Switch To remove excessive bass from an individual channel, press the Low Cut Switch (1) for that channel. + + - - M.A BUS 1 Low Cut M.A BUS 1 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-level input. It is particularly effective when handheld mics are used.
Compressor/Limiter The Compressor/Limiter (1) is a dynamic range controller that can be used to compensate 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 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.
Special Features Activation The CAM8PRO mixer has 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 potentiometer. 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.
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 17. Jumpers are included from the factory in positions: JP1: 1-3, JP2: 2-4, JP3: 1-3, JP4: 1-3, 2-4.. Warning: Disconnect AC Power before opening case. Bar Graph Options The mixerʼs meter can be configured to meter the output of either the main or auxiliary bus.
Troubleshooting Tips 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 22. Check the wall outlet. NO SOUND • Make sure the MIC/Line switch is in the proper position. (This is the most likely cause.) • Make sure both the master and channel input controls are turned up. • Check that the source signal cable(s) is properly connected and undamaged. • Adjust Input Gain/Trim Control potentiometer(s) to increase gain.
Glossary Auxiliary Input - Accepts only a balanced, line-level input (unlike the 8 channels); the auxiliary 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.
Technical Information SPECIFICATIONS Signal-to-Noise .................................................................. Ref +26 dBV @ 54 dB sys gain = 90 dB MIC Pre-amp Equivalent Input Noise .................................. -129 dB @ 150 ohm, 20 Hz to 20 kHz Maximum Voltage Gain...................................................... 96 dB Frequency Response ........................................................ ± 1 dB from 20 Hz to 20 kHz; +0, -3 dB from 10 Hz to 30 kHz Crosstalk (adjacent channels)....
PAD PAD MIC/Line Input -70/-50 dB -10/+10 dB MIC/Line MIC/Line Input -70/-50 dB -10/+10 dB MIC/Line +10 to +50 dB +10 to +50 dB Page 22 20 dB 20 dB AUX Line Input (Link Input) IN/OUT Hi Pass 100Hz IN/OUT Hi Pass 100Hz INPUT 2 INPUT 1 Bus JP4 AUX Main M A M A Main Volume Sum AUX Volume Sum EXT INT 20 dB 20 dB Limit IN/OUT Ratio Limiter Control Threshold BLOCK JP1 Pre-gain R342 20 dB Main 6 dB Meter JP2 AUX Bar Graph Ave Peak PAD Main MIC/Line Output +4/-50 dB
Notes Page 23
Warranty; Exclusion of Certain Damages The Bogen CAM8PRO Mixer is warranted to be free from defects in material and workmanship for two (2) years from the date of sale to the original purchaser.
