Bogen ANS501 User Manual

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Ambient Noise Sensor

Model ANS501

Installation and Use Manual

© 2003 Bogen Communications, Inc. All rights reserved.

Specifications subject to change without notice. 54-2096-01APrinted in Korea. 0312

Notice

Every effort was made to ensure that the information in this guide was complete and accurate at the time of printing. However, information is subject to change.

Important Safety Information

WARNING: To Reduce The Risk of Fire Or Electric Shock, Do Not Expose This Apparatus To Rain Or Moisture.

Always follow these basic safety precautions when installing and using the unit:

1. Read these instructions.

2.Keep these instructions.

3.Heed all warnings.

4.Follow all instructions.

5.Do not use this apparatus near water.

6.Clean only with dry cloth.

7.DO NOT block any ventilation openings. Install in accordance with the manufacturer’s instructions.

8.Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.

9.Only use attachments/accessories specified by the manufacturer.

10. Unplug this apparatus during lightning storms or when unused for long periods of time.

11. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

Domestic and International Listings

UL and CSA Listed

IMPORTANT

CAUTION: TO PREVENT THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER-SERVICEABLEPARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.

The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

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Contents

 

 

Page

DESCRIPTION ....................................................................................................................

4

Package Contents ................................................................................................................................

4

Features..................................................................................................................................................

4

PANEL DESCRIPTIONS ....................................................................................................

5

SENSOR MICROPHONE CONNECTIONS ....................................................................

6

Sensor Microphone Wiring ..............................................................................................................

6

Wiring Multiple Microphones ..........................................................................................................

6

OPERATION ....................................................................................................................

7-8

Front Panel Controls ..........................................................................................................................

7

AUX Level Control ..........................................................................................................................

7

Relative Gain Control ....................................................................................................................

7

Ramp Speed Control......................................................................................................................

7

Maximum Boost Control ..............................................................................................................

7

Threshold Controls ........................................................................................................................

7

Front Panel Switches and Indicators ..............................................................................................

7

Mode Switch ..................................................................................................................................

7

Status LED ......................................................................................................................................

7

Power LED ......................................................................................................................................

7

Connections..........................................................................................................................................

8

Balanced Input ..............................................................................................................................

8

Unbalanced Input ..........................................................................................................................

8

Sensor MIC ....................................................................................................................................

8

Defeat Input ..................................................................................................................................

8

Balanced Output ............................................................................................................................

8

Unbalanced Output ......................................................................................................................

8

AUX Input ......................................................................................................................................

8

MODULE SETUP ..........................................................................................................

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Bypass Mode ........................................................................................................................................

9

Normal Mode ....................................................................................................................................

10

Bypass Mode Illustration..................................................................................................................

11

Normal Mode Illustration ..............................................................................................................

12

AMBIENT LEVEL SETTINGS ..........................................................................................

13

SPECIFICATIONS ............................................................................................................

13

BLOCK DIAGRAM ............................................................................................................

14

LIMITED WARRANTY ....................................................................................................

15

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Description

The Bogen Model ANS501 Ambient Noise Sensor is designed to electronically adjust the level of a page announcement or background music in an area of a building where ambient noise levels are continuously changing. It ensures that page announcements or background music are intelligible even during periods of high ambient noise levels.

The ANS501 monitors the ambient noise level through the use of an ANS500M sensor microphone module. Each sensor microphone module includes an adjustable mounting base for precise positioning.

One microphone and one power supply are included with the ANS501. Additional microphones may be purchased separately.The control unit is capable of supporting up to four (4) microphones wired in parallel.Wire runs between the control unit and microphones consist of two-conductorcable and can reach 2,000 feet (with 20AWG wire) with no appreciable loss of signal strength.

Package Contents

1 - ANS501

1 - ANS500M Sensor Microphone

1 - Power Supply

1 - Instruction Manual

Features

Maximum boost control

Gain ramp speed control

Activity threshold control

Relative gain control

Ambient MIC input threshold control

Run/Set mode switch

Balanced input/output

Unbalanced input/output

Stereo unbalanced AUX inputs (summed mono) •

AUX input level control

Compact sensor microphone (one included)

AUX input bypasses gain control function

Remote defeat connections

Connect up to 4 sensor microphones for large area coverage

Bi-colorstatus indicator LED

Power indicator LED

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Panel Descriptions

1. Aux Input - Mono summing, stereo, unbalanced RCA inputs on side panel.

2.AUX Level Control - Controls the AUX input level feed directly to the output.

3.Unbalanced Input - High-impedanceunbalanced RCA input on side panel.

4.Balanced Input - High-impedanceelectronically balanced input (pluggable screw terminal).

5.Sensor MIC Input - Input connections for ANS500M sensor microphone(s) (pluggable screw terminal).

6.Defeat Input - The effects of the ANS501 will be defeated when these terminals are shorted together (pluggable screw terminal).

7.Balanced Output -Low-impedanceelectronically balanced output (pluggable screw terminal).

8.Unbalanced Output - Low-impedanceunbalanced RCA output on side panel.

9.Maximum Boost - Sets the maximum signal gain for the ANS501.

10. Ramp Speed - Sets the speed by which signal gain is increased/decreased once the ambient noise level is above/below the threshold.

11. Power Connection - Barrel type power input connector on side panel.12. Power LED - Green LED illuminates when power is present.

13. Status LED - Bi-colorLED illuminates when different thresholds are triggered to assist in setup.14. Ambient Threshold Control - Sets the ambient noise threshold level.

15. Activity Threshold - Sets reference level of typical audio program material applied to the unit.16. Mode Switch - Facilitates setup of the module settings.

17. Relative Gain Control - Sets the difference between the ambient noise level and page level that the ANS501 will attempt to maintain.

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Sensor Microphone Connections

Sensor Microphone Wiring

The ANS501 requires connection of at least one sensor microphone for operation.To allow for better ambient noise

sensing of large areas, up to 4 sensor microphones can be connected to a single ANS501.

All microphones are wired in parallel matching the polarity markings on the sensor mic with the marking of the two MIC terminals on the ANS501.

Wire runs between the control unit and microphones consist of two-conductorcable and can reach 2,000 feet (with 20AWG wire) with no appreciable loss of signal strength.

Wiring Details

ANS501 & Microphones

To Other Microphones

(4 Total)

Wiring Multiple Microphones

Physical connections can be made using either Home Runs back to the ANS501 from each sensor mic or by daisychaining sensor mics, depending on the installation.The maximum total wire length from any sensor mic to the ANS501 must be kept below 2000 ft.

Daisy Chain Style Wiring

Home Run Style Wiring

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Total Max Wire Length 2000 ft.

Max Run Length 2000 ft. (Each Run)

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Operation

Front Panel Controls

AUX Level Control

Controls the AUX input level, which is bussed directly to the output.Aux signal bypasses gain riding.

Relative Gain Control

Sets the relative amount of gain maintained above the ambient level. Range is 1 dB to 24 dB of gain.

Ramp Speed Control

Sets the speed by which gain is increased/decreased to the signal once the ambient noise level is above/below the threshold, from less than 1 dB/s (slow) to greater than 20 dB/s (fast).

Maximum Boost Control

Sets the maximum amount of gain. Range is 1 dB to 22 dB of gain.

Threshold Controls

Activity threshold is set just above typical operating level of the program material applied to the gain processing stage of the ANS501.Ambient threshold adjusts the ambient noise input threshold from 64 dBspl to 112 dBspl.

Front Panel Switches and Indicators

Mode Switch

The Mode switch can be set to “Run” (for normal operation) or “Set”(for set up).

Status LED

Bi-colorLED illuminates when different thresholds are triggered to assist in setup.

Green indicates "+" gain.Amber indicates "-"gain.

Power LED

Green LED that illuminates when power is present.

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Operation, cont.

Connections

Balanced Input

High-impedance,electronically balanced, pluggable screw terminal input. Signal gain responds to ambient noise changes.

Unbalanced Input

High-impedanceunbalanced RCA input. Signal gain responds to ambient noise changes.

Sensor MIC

Connections to ANS500M sensor microphone(s) are made here.The input is a pluggable screw terminal input.

Defeat Input

The effects of the ANS1R will be defeated when these terminals are shorted together.The input is a pluggable screw terminal input.

Balanced Output

Low-impedanceelectronically balanced, pluggable screw terminal output. Signal gain responds to ambient noise changes.

Unbalanced Output

Low-impedanceunbalanced RCA output. Signal gain responds to ambient noise changes.

AUX Input

Mono summing, stereo, unbalanced RCA inputs. This input bypasses the gain adjustment process of ANS501 and is fed directly to the output, via the AUX level control.

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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 signal 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.

- or -

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 necessary, set the ACTIVITY THRESHOLD control higher if the maximum signal level is not achieved. Tweaking adjustments to MAX BOOST, RELATIVE GAIN, and RAMP SPEED controls may also be necessary.

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Module Setup, cont.

Normal Mode

All sources are affected by the gain adjustment process. Background music source will need to be routed through the main mixer inputs, which will be affected by the gain adjustment process. Refer to page 12 for illustration.

Start with all POTS turned fully clockwise (AUX IN is not used in this mode).

1. Set MODE Switch to "SET" mode.

2.Set RELATIVE GAIN to the desired amount of signal gain you would like the balanced/unbalanced input to ride over the ambient level.

3.Set MAX BOOST to limit the maximum amount of signal gain for the whole system.

4.Adjust AMBIENT THRESHOLD until the STATUS LED starts flashing amber, then adjust ACTIVITY THRESHOLD until amber stops flashing.

5a. 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 ‘Run’.

- or -

5b. 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.

6.Adjust RAMP SPEED to desired settings.

7.Test the system’s response to noise and, if necessary, set the ACTIVITY THRESHOLD control higher if the maximum signal level is not achieved. Tweaking adjustments to MAX BOOST, RELATIVE GAIN, and RAMP SPEED controls may also be necessary.

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