7.PRIORITY (CHANNEL 1 and 2 ONLY)
Turning the priority control clockwise allows one channel to override the others in the mix. It does this by ÒtrickingÓ the gain computing circuits into thinking this channel is louder than the others. Up to 9dB of priority is available.
8.AUX MASTER LEVEL CONTROL
This control sets the level of the signal being sent to the Aux Out. This level should be set after the individual channel levels have been set.
9.DOWNWARD EXPANDER
The downward expander can be used to attenuate the system gain when all of the input signals are low. This can be used to prevent background room noise from being amplified.
SETTING THE DOWNWARD EXPANDER
Have someone speak into a microphone at the softest level you can expect to encounter. Slowly turn the downward expander clockwise until the background noise between words is attenuated. Be careful not to go too far. The more downward expander that is used, the less ÒnaturalÓ sounding the system will become.
This method will give you a good starting point, but the best way to set the downward expander is during an actual meeting or event. While doing this, the downward expander can be adjusted for the best sound. If you have to deal with both loud and quiet events, you will need to trade off between natural sounding ambient and back- ground noise.
10.MASTER GAIN TRIM
This control sets the maximum overall system gain and should be set with the front panel master gain set to the full clockwise position, all channels at unity, and external power amps turned up and locked at operational settings. When trimmed to a safe margin below feedback, no combination of user controls can cause feedback. This trim provides up to 25dB of attenuation of the system gain.
11.NOTCH FILTER LEVEL CONTROL
The notch filter level control adjusts the amount of cut at the frequency selected by the corresponding frequency control (12). It is adjustable from 0dB to 15dB of cut.
12.NOTCH FILTER FREQUENCY CONTROL
The notch filter frequency control is used to select the center frequency of the notch filter. The bottom filter has a range of 40Hz to 925Hz. The middle filter has a range of 260Hz to 6kHz. The upper filter has a range of 500Hz to 12kHz.
13.POWER LED
Indicates that AC mains power power is connected and power switch is in the ÒONÓ position.
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