Assessments - 3, GPA: 3.7
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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). Page 13 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. - + - ++ - Gnd Balanced Source No connect G - + - + + Gnd Unbalanced Source G - + - + + Gnd Unbalanced Source G - + - ++ - Gnd Balanced Source No connect G - + - + + Gnd Unbalanced Source G - + - + + Gnd Unbalanced Source G 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. - + - ++ - Gnd Balanced Source G Page 14 Fine Tuning Low Cut Switch To remove excessive bass from an individual channel, press the Low Cut Switch (1) for that channel. + + -- M.A Low M.A BUS 1 Cut 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. 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 button simultaneously applies phantom power to all channels set to mic-level. Page 15 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. 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 and limiting functions by controlling threshold and ratio. The Threshold Control (2) is a screw potentiometer that sets what signal level will activate 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 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 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 16 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. Warning: Adjustments made to any other internal components may void the warranty. AUX IN MAIN OUT ...
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