AudioPressBox APB-320 USB-C Owner's Manual - Page 7
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Usage
APB-320 C-USB is designed for use as a distribution audio amplifier for press conferences. It features two analog inputs with input PAD – Mic/ Line
switch, one digital input and output USB interface, sixteen analog audio outputs with individual output level switch – Mic/Line and four digital USB audio outputs.
Analog inputs also feature built-in fixed High Pass Filter set to 120Hz and fixed Compressor with Limiter to ensure high quality output signal without pops
especially when used with microphones. Mic/Line Switch is input PAD (-26dB) for selecting the input sensitivity for microphone or line level inputs. With switch set
to Mic you can connect input signal levels from -56dBu to -16dBu and at Line position from -30dBu to +10dBu. When Mic input level sensitivity is set you can also
turn ON the Phantom power for the microphone – please use this with condenser microphones only. When the input sensitivity is set to Line, the Phantom power is
automatically turned OFF to avoid damage of connected device.
Digital USB Video-Conf. In/ Out is for connection to video-conference where signals from both analog inputs are mixed and transmitted to connected
device and the audio from the video-conference (other side) is mixed with analog inputs and sent to all outputs (analog and also USB). So, the video-conference
attendants can hear speakers connected to AudioPressBox and journalists can record speakers from the room and also speakers attending the videoconference.
USB outputs carries the same audio signal as analog XLR outputs. These outputs can be used for live streaming on social media or for digital recording
on laptop or smartphone which supports digital USB audio interface.
For proper operation and to maintain declared parameters, it is necessary to drive the APB with the correct signal level from Analog or USB Inputs. For
checking the input signal level there is an Input Signal Indicator for each Input. You have proper input signal if the LED "OK" is at least blinking. You can adjust the
right input level for Analog and USB Inputs with dedicated Gain knobň
Each analog XLR output is individually transformer balanced and isolated. You can switch the output level for each output separately to Mic or Line level.
Thanks to the built-in 14,8V 2200mAh Li-Ion battery-pack you can use your press box also on places where is no electric power available. So, no matter if
your conference is indoors or outdoors. Our APB can operate up to 20 hours from the battery-pack on full load. Thanks to the Charge status indicator you always
know what is the actual battery-pack charge. If powered from battery-pack and the LED "LOW" is blinking you should immediately find the power source or the
APB will be soon out of power and will Turn OFF. Charge time for fully discharge battery-pack is around 2,5 hours. Every time the power adaptor is connected, the
battery-pack is charging. No matter if the Power Switch is turned ON or OFF. There is also battery management built in for the battery-pack, so it can't be
overcharged or deeply discharged. Please never left the unit in discharged state for a longer period of time – it can damage the battery. It is
recommended to charge it before not using it for a longer period.
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