AVProAlliance AViMUX4 Manuel d'utilisation et d'application - Page 13

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Microphone Input Calibration Controls

The calibration control for each microphone input is located beside each of the MIC IN jacks.

The CAL controls are multi-turn pots, adjustable with a miniature screw driver (not provided).

Multiplex

CAL 4

Rate

MIC 4 IN

OUTPUT

Figure 9. Calibration controls on each microphone

input provides level adjustment for accurate

measurements

The calibration controls are used to adjust

the level from each microphone input to the

iMUX4. Each microphone and its respective

input should be calibrated to a reference

level before using the iMUX4. This insures

that each microphone and its respective

input of the iMUX4 is providing a proper

level to the RTA.

The microphones supplied with the iMUX4

are labeled as MIC 1, MIC 2, MIC 3, and

MIC 4. Your iMUX4 comes pre-connected

to the proper cables and microphones;

observe the color coding when reconnecting;

Mic 1: Red, Mic 2: Blue, Mic 3: Green, and

Mic 4: Yellow. You should periodically

verify

proper

calibration

procedures below. Microphones can change

over time and use so it's essential to check it

for best accuracy of your measurements.

iAI2 Microphone Calibration

The microphone calibration controls in

Studio Six Digital AudioTools App are

located in the "Settings" menu under

"Microphone Setup". Once you have your

system properly connected and powered up

you should see the iAI2 microphone

indicated as an input source option. Select it

by touch indicated by the field becoming

CAL 2

CAL 3

MIC 3 IN

MIC 2 IN

MIC 1 IN

using

yellow. Select the blue arrow on the right

for the calibration menu.

1. Select Mic 1 on the iMUX4.

2. Insert

CAL 1

microphone calibrator with sound seal

grommet ~.75 inch from end (see picture

pg. 7) and select the 94 dB test tone on

the calibrator.

3. In

Calibration menu:

a. Switch the 48v phantom power to on

and select reverse polarity. Confirm

the LED is lit for Mic 1.

b. Select Low Range and set the Gain

Setting to 35 dB for starters.

c. Now touch the dB level box. This

will reveal the iPad keyboard. Enter

94 dB and touch "Done". This will

change the trim box to the required

trim.

d. If the trim is between -2 and -7 dB

you've got it. If not, try a different

Gain

procedure.

4. Now, move the microphone calibrator to

Mic 2 and select Mic 2 on the iMUX4.

5. Adjust the trim screw near the input on

the iMUX4 until this Mic also reads 94

the

dB in AudioTools. Don't change the

trim in AudioTools.

6. Repeat for all microphones.

You may find that you'll need to readjust

Mic 1's trim control up or down if you do

not have enough adjustment available on the

other trim screws. NOTE: Add a new input

source in AudioTools and calibrate this for

Mic 1 connected directly to the iAI2

(bypassing the iMUX4) for low noise

requirements. This is desired for ambient

noise or ETC measurements.

the

microphone

the

AudioTools

Setting

and

into

the

Microphone

repeat

the