Active Vision ACA-MIC04 Instructions

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Microphone Instructions

The ACA-MIC04 (MIC04) is a high quality, table top, 12VDC powered, flush mount, Omni-

directional, pre-amplified microphone for use with DRVs, I/P cameras, etc. Note- the audio output

of the MIC04 is jumper selectable "line level" (0db) or "microphone level" (-30db).

Microphone Placement

Locate the Microphone in the middle of the room to be monitored such as on a conference table.

Do not place the microphone near light fixtures or electrical equipment. The microphone should

be placed at least five feet away from the subject(s) to be monitored. The microphone is still

useable in the range of 15-25 feet but is dependent on the level of background noise in the area.

Experimentation in the environment will determine what distances work best.

Cable Run and Connection

Remove the 4 screws holding the bottom cover on and connect the wires as shown in figure 1.

Run a 22 gauge, three conductor shielded cable between the microphone and the monitoring

device. Keep the cable run distance under 1,000 feet and away from AC power sources, light

fixtures and electrical equipment. Connect power to the + terminal, the audio signal to the "audio"

terminal and ground to the – terminal. The Ground of the power and audio signal must share a

common ground for proper operation.

Adjusting the Microphone Gain

The microphone output level is set by selecting the desired volume range and adjusting the

gain control.

The "Volume Range" jumper should be set to the "LO" position when using the microphone with

I/P cameras that utilize "microphone inputs" also known as "Mic Level" inputs. This sets the

maximum gain of the microphone's pre-amp to x14. The jumper should be placed in the "HI"

position when using the microphone with "Line level" inputs of DVRs and I/P cameras. This sets

the maximum gain of the microphone's pre-amp to x196.

The microphone is shipped with the gain set at midrange. If the sound at the "head end" is

distorted, rotate the control towards the – mark (counter-clockwise). If the volume at the "head

end" is too low, rotate the control towards the + mark (clockwise).

Setting the Microphone Hi-Cut/Lo-Cut Jumpers

The normal frequency response of the microphone is 500-13Khz. When both jumpered "in", The

"HI Cut" and "Lo Cut" filters set the microphone's frequency response to 900-6Khz. Enabling one

or both of the filters is useful when background noise needs to be further reduced and

intelligibility of speech emphasized. We recommend experimenting with the jumper settings to

achieve the best acoustic result for your application.