Filename:MC4-BT MANUAL
01/26//18
Page 6 of 6
If you want Bluetooth to have Priority, Slide the slider to the BT selection and it will have priority over the 3.5
mini jack.
If you want the 3.5 minijack to have priority over the Bluetooth slide the slider switch down to the Input # 1
position.
Once you have chosen the priority adjust the Priority override sensitivity control (G1)
Please note that the Bluetooth signal must be turned up the entire way to send enough signal to trigger the
override module.
4 audio inputs: 3.5 mini jack, Balanced input, TosLink, Bluetooth (optional)
The Normal input accepts an unbalanced input via a 3.5 Mini Jack. 1 Balanced input via a Phoenix style screw terminal plug.
Input 3 can be microphone level or line level, set by ( ). The line level can range from -20dBu to 0dBu. The microphone level input
can be -40dBu. The minijack can accept mono or stereo inputs. The stereo channels are summed together. This audio is adjusted with
potentiometer adjacent by each “Input”.
Priority Override Feature
The Priority input accepts balanced input levels of jumper selected 100 volts audio, 70 volts audio, 25 volts audio and 1volt
(approximately line level) audio. Audio on the Priority input suspends audio on the Normal or Auxiliary input and switches the
speaker amplifier to pass the Priority audio (A8). After the Priority audio stops, the unit waits a selectable time delay before returning
to the Normal or Auxiliary audio input. The delay is computer settable via RS232 from 5 to 60 seconds. With an adapter, the USB
connector on a computer can be used to set the delay.
Balanced Line Level Output
A nominal 0dB level, balanced output ( ) is available. The audio output is post-master fader. The master (Master Volume)
fader is on the face per source.
Microphone Wireless Microphone / “Auxiliary Input” A 3.5mm connector is available to connect an infrared receiver. This
receiver picks up an infrared signal from a special wireless microphone. The wireless microphone is interrupted by priority audio.
There is a level adjustment pot on the circuit board to balance the microphone audio level against other audio input levels. Any line
level may be input here.
