1. INTRODUCTION
Audiophile Circuits League
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-The main purpose of the ACL Audio Interface
module is to interface modular synthesizer systems with professional audio
recording and stage equipment.
The combination of studio quality signal path, �lexible routing possibilities and a
headphone ampli�ier, capable of driving both high and low impedance
headphones with low distortion, makes the connection between these different
environments effortless and sonically transparent.
The ACL Audio Interface offers balanced to unbalanced and unbalanced to
balanced stereo lines with level controls. The stereo signal from the auxiliary
input, also with level control, can be optionally routed to and mixed together
either with balanced to unbalanced, or unbalanced to balanced line signals, or
can be muted. The headphone ampli�ier can also get its signal from one or the
other line after the level control and mixing stage, or can be muted. Since the
ampli�ier is AC coupled only at the input, but not at the output, there is an
on-board DC protection circuit included. In case the headphone ampli�ier is
driven into clipping, the protection can also be tripped. The module has a
soft start function* and one overload indicator for every line.
*With the soft start function, the interface switch is turned on after a while after
turning on the Eurorack main unit. This function can prevent output of
unexpected sound that another module will emit at startup, which will cause
damage to the speaker.
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