Priority mute contact:
A priority mute contact is provided with each output, allowing to completely mute the music
at presence of a contact closure between both terminals. This contact is convenient for
situations where a separate emergency system is installed and complete background music
muting is required at occasion of a (fire) alarm. The emergency system contact outputs can
be connected to this contact input.
Bluetooth antenna connection:
The included Bluetooth antenna should be connected to this terminal for good signal reception.
It is connected using an SMA type connector and allows antenna extension (with an optional
extension cable) for mounting outside of closed rack cabinets.
Unbalanced stereo line inputs:
Unbalanced line level input sources (e.g. media-players, radio tuners, ...) can be connected
to line inputs channel 2 to channel 4. These standard line inputs are implemented using
RCA connectors and fitted with a gain control potentiometer whereby the input sensitivity
can be controlled within a range of +4 dB ~ -20 dB.
NOTE
The gain control potentiometers for channel 3 (mixed with Bluetooth receiver) and channel 4
(mixed with front 3.5 mm jack input) are also affecting the level for these secondary inputs.
Balanced stereo line input:
Balanced line level audio sources can be connected to channel 1 which is implemented using
2 x XLR connectors. It is fitted with a gain control potentiometer whereby the input sensitivity
can be adjusted within a range of +4 dB ~ -20 dB. A mode switch allows to switch the input
between mono and stereo mode and mixes both channels when switched to mono, making
them identically available on both output channels.
Balanced microphone inputs:
Balanced mono sources (e.g. microphones) can be connected to inputs mic 1 and mic 2 which
are implemented using XLR connectors. They are fitted with a gain control potentiometer
whereby the sensitivity can be adjusted within a range of -6 dB ~ -50 dB.
These inputs are fitted with a three-band tone control, allowing signal equalization within
a range of ± 15 dB. A phantom power switch enables 15 Volts phantom power supply for
powering condenser microphones and a talk over switch suppresses (-24 dB) all other audio
sources in that zone.
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