User manual BIAMP ANC22

[. . . ] The Output has an additional 6dB of gain when used in a balanced fashion. ý Input: These plug-in barrier strip terminals are for connection to the output of a program signal source. The ANC22 works equally well with a mono program signal connected to either the left or right Input/Output. For connection to unbalanced program signal sources, wire high to (+) and ground to both (-) & ( ). The Input will accept either +4dBu or -10dBu nominal level signals (see Input Level Switch below). ý Sense Input: These plug-in barrier strip terminals are for connection of an external microphone, which is used to pick up room ambient (background) noise. [. . . ] Set the Min Level control for the program volume which will be appropriate when background noise is the `quietest'. Once Min Level has been set, press the Setup Button and the Sense Indicator will light (see Sense Level & Indicators below). Sense Level & Indicators: This screwdriver adjustable control determines the appropriate sense input level. Initially, this control should be increased only until the Low Indicator goes off. Once Sense Level has been set, press the Setup Button and the Max Indicator will light (see Max Level below). If so, decrease Sense Level until the Peak Indicator goes off, then repeat the setup procedure to store the new settings in non-volatile memory. Max Level: This screwdriver adjustable control determines the maximum output gain of the ANC22 (for periods of high ambient noise). Set the Max Level control for the program volume which will be appropriate when backgound noise is the `loudest'. Once Max Level has been set, press the Setup Button and the Time Indicator will light (see Sample Time below). NOTE: If Max Level 3 settings cause the Peak Indicator to light, decrease Sense Level until the Peak Indicator goes off, then repeat the setup procedure to store the new settings in non-volatile memory Sample Time: This screwdriver adjustable control determines the length of time the ANC22 uses to sample noise levels at the Sense Input. Sample Time affects how accurately the ANC22 will calculate an `average' noise level, as well as how quickly it will respond with a program volume adjustment. Lower settings allow less sampling time, but offer a quicker response time. This is good for applications (such as subway terminals) where the ambient noise level may change drastically within a short period of time. Higher settings provide a longer sampling time, and a longer response time. This is good for applications (such as restaurants) where the ambient noise level changes gradually. A setting of `10 sec' is a good starting point for most applications. Once Sample Time has been set, press the Setup Button and the Ratio Indicator will light (see Gain Ratio below). NOTE: During setup of Sample Time, the Bypass Indicator functions as a Rate Indicator, and will flash each time a complete sampling period has elapsed (see Bypass Switch & Indicator below). Gain Ratio: This screwdriver adjustable control determines how much the ANC22 will increase program volume, relative to a given increase in ambient noise. A minimum setting (`1:2') produces a 1dB increase in program volume for every 2dB increase in `average' ambient noise level. This is good for applications (such as background music) where the program signals must remain subdued. A maximum setting (`2:1') produces a 2dB increase in program volume for every 1dB increase in `average' ambient noise level. [. . . ] Electro-magnetic fans, electrolytic capacitors, and the normal wear and tear of appearance items such as paint, knobs, handles, and covers is not covered under this warranty. BIAMP SYSTEMS SHALL NOT IN ANY EVENT BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, LOSS OF USE, PROPERTY DAMAGE, INJURY TO GOODWILL, OR OTHER ECONOMIC LOSS OF ANY SORT. EXCEPT AS EXPRESSLY PROVIDED HEREIN, BIAMP SYSTEMS DISCLAIMS ALL OTHER LIABILITY TO PURCHASER OR ANY OTHER PERSONS ARISING OUT OF USE OR PERFORMANCE OF THE PRODUCT, INCLUDING LIABILITY FOR NEGLIGENCE OR STRICT LIABILITY IN TORT. THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED. [. . . ]