2) Connection of low impedance loudspeaker signals:
The ATU44 can be used for conversion of a low impedance (8Ω) loudspeaker level
signal into a balanced line level audio signal. Depending of the amplifier power, the
corresponding terminals of the loudspeaker input (5-pin terminal block) connector
shall be used. Below table gives an overview of the matching voltage tappings for
various amplifier power:
Voltage tapping Amplifier power
33 Volt
50 Volt
70 Volt
100 Volt
< 150 Watt amplifier power (@ 8 Ohm)
150 Watt < 300 Watt amplifier power (@ 8 Ohm)
300 Watt < 600 Watt amplifier power (@ 8 Ohm)
> 600 Watt amplifier power (@ 8 Ohm)
The line level output (available on the XLR connector) can then be fed directly to any
line level input on amplifiers or pre-amplifiers. Make sure the input selector switch is
in 100V (right) position.
3) Connection line level input signals:
The ATU44 can be used as a galvanic isolator between line level input signals allowing
it for being used as an audio isolation solution, solving hum and buzz problems caused
by ground loops. The line level input shall be applied to the 3-pin line level terminal
block input connector.
For balanced input signals, Sig+ (XLR pin 2) shall be connected to the ‘+’ terminal, Sig-
(XLR pin 3) shall be connected to the ‘-’ terminal, and GND (XLR pin 1) shall be connected
to the ‘GND’ terminal. For unbalanced input signals, the signal shall be connected to the
‘+’ signal and the ‘GND’ shall be connected to the ‘-’ terminal.
The line level output (available on the XLR connector) can then be fed directly to any
line level input on amplifiers or pre-amplifiers. Make sure the input selector switch is
in Line (left) position.
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General