8 Channel Public Address (PA) Mixer With Tone Generator

This unique Redback PA mixer features six input channels which are user selectable for either balanced mic or line as well as two dedicated line level RCA inputs and a 3.5mm audio jack for portable devices. The unit has six levels of VOX priority on inputs 1-6 with adjustable VOX sensitivities on each input, and a 24V DC output (limited to 120mA current draw) which becomes live when any triggers are activated or VOX/PTT circuitry becomes active. In addition it incorporates a MP3 based message player for playback of Alert, Evacuation or Chime tones. The Alert and Evacuation tones once triggered, will mute inputs 2-8, regardless of their priority settings.

Tone Generator Operation.
Tones, chimes and pre-recorded messages are played from the micro SD card which plugs into the rear panel of the mixer. Individual level controls are provided for alert/evac, chime and voice over. All of these can be triggered by closing contacts such as switches, from Fire Indicator Boards (FIB) or any other remote contact source.

Adjustable Input Sensitivities.
On the rear panel a DIP switch allows selection of input sensitivity between 3mV, 100mV and 1V, plus phantom power and VOX muting options for each of the inputs.

Power
The mixer is powered by 24V DC and is provided with a 2.1mm DC jack input and a back up 24V DC power source via screw terminal block for use when mains power fails. A 24V DC output is provided (limited to 120mA current draw) which activates when any of the Alert, Evacuation or Chime triggers are operated. It also activates when VOX circuits or any of the PTT muting is activated.

Box Contents
A 4427 Mixer 8 Channel with MP3 active indicator
24V 1A DC Plugpack
Instruction Booklet