AVProAlliance AViMUX4 Betriebs- und Anwendungshandbuch - Seite 11

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OPERATION

Introduction

The iMUX4 Microphone Multiplexer connects to a variety of XLR based RTA's to provide

acoustic analysis of rooms using multiple microphones. Be aware that the microphones use

inverse polarity and a 48v phantom voltage when setting up your RTA. The iMUX4 provides

accurate sound speaker equalization by enabling the simultaneous use of up to four microphones

placed throughout the room. Due to the inherent signal to noise ratio of Type 2 microphones and

the switching circuit of the iMUX4, it is recommend to drive your test tone to a level of at least

70 dB SPL for best results. Care should be taken to periodically calibrate your iMUX4 with your

RTA. This includes alignment of microphone #1 with the RTA and then each remaining

microphone with the first. AVProAlliance.com recommends the Reed SC-05 for this function.

Power – On/Off Switching

The iMUX4 contains no on/off switch. The

iMUX4 circuitry is powered by a 9 volt

battery pack consisting of 6 AA batteries

mounted inside the battery compartment of

the iMUX4. Phantom microphone voltage

supplied to the unit from the RTA switches on

the iMUX4. The phantom

voltage is supplied from the RTA ANALOG

INPUT jack to the "OUTPUT" jack on the

iMUX4.

The RTA (or iAI2) must be connected,

powered on, and the phantom voltage of 48V

selected in the top tool bar before microphone

voltage is output to the iMUX4 and its

internal circuits are powered on.

LEDs on the iMUX4 provide an indication

when the unit is powered on and ready for

operation. When any LED is blinking or

illuminated, the iMUX4 is powered on and

ready for use. Erratic LED blinking indicates

new batteries are required.

Battery Installation/Replacement

microphone

Figure. 7 The iMUX4 battery compartment

The AVPro iMUX4 requires six AA batteries

for proper operation. The iMUX4 draws very

little current from the batteries, so the battery

lifetime will be close to 24 hours. The

batteries are replaceable.

To install or replace the AA batteries:

1. Remove the battery compartment on the

iMUX4 by gently releasing the tab

holding the battery compartment door.

2. The battery compartment door releases

and may be lifted away. Lift gently and

remove the cover.

3. Pull each of the batteries out of the battery

compartment.

4. Install AA batteries into the battery

compartment observing proper polarity.

5. Reinstall the battery compartment door.