INSTALLATION and POWER
page 1 – 4
AIR 1 / Dec 2007
Audio and Control Wiring
All audio I/O connections to the AIR 1 console are made via TRS and XLR
connectors located on the rear panel of the console.
TwoXLRfemaleconnectorsareprovidedtobringbalancedmonomicrophone
levelsignalsintotheconsoleforcontrolbythefirsttwo(microphone)faders.These
XLR connectors are wired “pin 2 hot.”
SixpairsofTRS(Tip-Ring-Sleeve)jacksareprovidedtobringbalancedstereo
line level signals into the console for control by (line) faders three through eight.
Thehighsideofthebalancedlineiswiredtothetip(T),thelowsideofthebalanced
line is on the ring (R), and the sleeve (S) is connected to the console ground. The
tip and ring are automatically switched to ground when there is no matching plug
inserted in the jack.
OnepairofTRSjacksisprovided to bring an additionalstereolinelevelsignal
into the console for use by the monitor circuits. These are also wired with the tip
high, the ring low, and the sleeve ground, and with automatic grounding when no
plug is inserted.
Two pairs of TRS jacks are provided to bring the two stereo program outputs
(PGM 1 and PGM 2) out of the console as balanced line level +4dBu signals. The
tip is high, the ring is low, and the sleeve is ground.
One pair of TRS jacks is provided to bring the stereo monitor output out of the
consoleasseparate (left andright)unbalanced line levelsignalsat a nominallevel
of -2dBu (equivalent to one side of a balanced +4dBu output). The tip is high and
both the ring and the sleeve are connected to ground.
One TRS jack is provided to bring the mono cue out of the console as an
unbalancedlinelevelsignal(nominal-2dBu).Thetipishighandboththeringand
the sleeve are connected to ground.
One TRS is provided for the operator to plug in a set of headphones. This is
wired as a standard headphone jack, with the left signal on the tip, the right signal
on the ring, and the sleeve conne cted to ground.
One TRS jack is provided to hook up an interface to an Air Tally light. This
outputcomesfromasetofrelaycontactsandisdesignedtoswitchalowDCvoltage
(30 VDC maximum) at a moderately low current (2 ADC maximum) to activate
a DC light, or to activate an external DC relay which can then be used to activate
anACoperatedlight.NeverbringACpowerintotheconsoleonthisoranyother
connector. The relay normally open (N.O.) contact appears on the tip and the
common contact appears on the ring. The sleeve is connected to ground.
One remaining TRS jack on the rear panel is not used.
A 5-pin DIN connector is provided to accept console power from the external
power supply.
AIR 1 / Jan 2008
