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9
ACS 4.4 G2 Installation and Operation Manual
INSTALLATION
Installation
Cable Preparation
The terminals block connectors used for input channel expansion and remote-con-
trol connections accommodate wire sizes from 16 - 28 AWG, solid or stranded.
Before installing a wire, remove the euro-block screw terminal plug and turn each
terminal capture screw fully counterclockwise. Strip each conductor to a length of
0.25” and insert the conductor fully into the terminal. Turn the capture screw fully
clockwise to secure the conductor. Verify that no bare/stray wires are exposed.
Input Channel Expansion
Input expansion may be accomplished by using two ACS 4.4 G2 switchers and con-
necting a shielded cable between the first ACS 4.4 G2’s EXT1L unbalanced input
terminal and the second units’ output. The cable shield should be connected to the
ground terminal. Follow the same procedure for the EXT1R channel. The above
example provides 8 inputs, with the first switcher providing the main output.
(Top row, TB-1)
(Bottom row, TB-1)
Audio Input and Output Level Adjustment
Once the input and output connections have been made, the input levels can be
adjusted. The switcher is factory set for unity gain so normally no additional adjust-
ment is necessary. Recommended average input levels would be in the range of 0
dBu to +8 dBu. Should input levels need to be changed, trimmers are accessible
from the front panel. Each stereo input is labeled and has two trimmers, one for the
left channel one for the right channel.
Calibrating audio levels on the switcher:
1 – Remove power from the unit and remove the circuit board from the chassis by
unscrewing the four rear panel screws and sliding the rear panel and circuit
board out of the back of the chassis.
2 –Feed a reference signal into input channel 1. A 2 kHz sine wave test tone at +4
dBu is used at the factory. Connect a Hi-Z dB meter to the TEST jack JP2.
3 – Re-apply power. Adjust the left and right input 1 trimmers to a zero level on
your dB meter.
4 – Disconnect the dB meter from JP2 and connect a balanced stereo input dB
meter to the output. Adjust the output trimmer R68 (Output 1 Left) and R83
(Output 1 Right) for the desired output level. +4 dBu is set at the factory. Make
sure input 1 to output 1 is selected using the front panel controls. Repeat this step
for Output 2 (R97, R112), Output 3 (R128, R141), and Output 4 (R156, R170).
5 – Once input 1 and the four outputs have been calibrated the rest of the inputs maybe
calibrated by routing them to output 1 and adjusting the input level trimmers.
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