Microphone Inputs; Mute Group; Usb Port - AMX ALR-AEC-8 ALERO Instruction Manual

PA Speaker Connector Pin-out
FIG. 9

Microphone Inputs

The eight 3.5 mm 3-pin captive-wire microphone input connectors (FIG. 10) provide the following features:
Support up to eight mono microphones

Supports Balanced and Unbalanced audio

Microphone Input Level: +20 dBu (maximum)

Microphone Input Impedance: Line Input: 50 kΩ

Microphone Input Gain: -72 - 104 dB

Phantom Power: 48 volt all inputs

Microphone Input Pin-out
FIG. 10

Mute Group

Alero provides users the ability to set the eight microphones into five mute groups. These five groups are muted using an external
contact closure. The contacts, connected through the 5-pin 3.5mm Phoenix connector labeled MUTE (FIG. 11), provide a
connection to ground to mute the microphone inputs assigned to the corresponding group through the web interface.
Mute Group Input Connector
FIG. 11

USB Port

The USB port provides a serial bus using a Standard-B connection on the Alero. It can be used to provide audio signals to and from
a PC in certain conference room applications.
USB Port Pin-out
FIG. 12
The USB Pin-out:
Pin Name
1 VCC
2 D-
3 D+
4 GND
Alero 8-Channel Microphone Mixer Instruction Manual
0 dBu (nominal)
Microphone: 10 kΩ
Cable Color Description
Red +5 VDC
White Data -
Green Data +
Black Ground
Hardware Description
5