Module Setup
All inputs (balanced and unbalanced) into the ANS501, with the exception of the Aux input, will be affected by the automatic gain adjustments of the ANS501.
In audio systems that provide continuous background music, it may be desirable to have the background music stay at a fixed level but have all other source inputs (like a paging microphone) change level in response to the ambient noise level in an area. Background music is typically provided to make a venue seem less empty during slow periods or to help mask conversation during quiet times. It is often undesirable to have the background music level increase as ambient noise increases since it only adds to the overall noise in the area.The ANS501 provides an Aux input that bypasses the gain adjustment process so that it does not change with ambient noise levels.
Bypass Mode
Background music bypasses the gain adjustment process. Refer to page 11 for illustration.
Start with all POTS turned fully clockwise (except AUX LEVEL, which should be fully counterclockwise).
1. Connect the background music source to the ANS501’s RCA Aux IN jacks.
2.Set the background music to the desired operating level using the AUX LEVEL control.
3.Set MODE Switch to "SET" mode.
4.Set RELATIVE GAIN to the desired amount of sig- nal gain you would like the balanced/unbalanced input to ride over the ambient level.
5.Set MAX BOOST to limit the maximum amount of signal gain for the whole system.
6.Adjust AMBIENT THRESHOLD until the STATUS LED starts flashing amber, then adjust ACTIVITY THRESHOLD until amber stops flashing.
7a. Using the chart and diagram on page 13, set the AMBIENT THRESHOLD to the dBspl level where automatic increases to the system volume would be desired, then set the MODE Switch to the ‘Run’ position.
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7b. If the live ambient noise level (while making these adjustments) is at the desired trip point, set the MODE Switch to the ‘Run’ position, and then adjust the AMBIENT THRESHOLD control to a point where the STATUS LED flashes green.
8.Adjust RAMP SPEED to desired settings.
9.Test the system’s response to noise and, if neces- sary, set the ACTIVITY THRESHOLD control high- er if the maximum signal level is not achieved. Tweaking adjustments to MAX BOOST, RELATIVE GAIN, and RAMP SPEED controls may also be nec- essary.
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