Introduction
Universal input adapter unit
The ATU44MK2 is a universal input adapter unit for conversion between various audio
level signals, offering a wide variety of connection and extention possibilities to audio
systems. The speaker level input features various tappings for 100V, 70V, 50V and 33V
audio levels, while a balanced line input allows conversion between balanced and/or
unbalanced line level audio signals.
A typical application example is the conversion of any loudspeaker level audio signal to
balanced or unbalanced line level signals. Any type of loudspeaker level signal can get
applied to its input. This can be useful for expansion of any constant voltage distributed
audio system and feeding the transformed output to an additional amplifier. Another
typical application is connection of recording equipment on loudspeaker lines.
Using the galvanic isolation between all the in & outputs, it can be used as an audio
isolation solution, solving hum and buzz problems caused by ground loops.
The front panel switch allows input signal selection between line or loudspeaker level
input, while all inputs are connected using terminal block connectors. The line output is
connected using a male XLR connector.
A variety of optionally available mounting brackets are allowing desk, closet or 19”
equipment rack installation.
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General