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Balanced/Unbalance Switch (SW2)
Audiocom Call Send and Receive DIP Switches
By default, all channels of the ES4000A can send and receive Audiocom call signals. You can disable call send or call receive
capability for selected channels, if desired.
NOTE: When the BAL / UNBAL switch on the back panel is set to the UNBAL position (for use with a Clear-Com Intercom
system) the call send and call receive DIP switches have no effect. Call send and call receive are always ON for Clear-Com
usage.
Balanced/Unbalance Switch (SW2)
This switch must be set to the balanced (BAL) position for use with an Audiocom Intercom System. Set the switch to the
unbalanced (UNBAL) position when using the US2000A / ES4000A with a Clear-Com Intercom System.
Direct Program Listen Enable / Disable Jumpers
By default, each program input can be heard by intercom stations on the corresponding intercom channel. (This can be turned
ON or OFF for each program input via the US2000A front panel programming. See "Turning Program Inputs On and Off" in
the Operation section of the US2000A User Instructions.) Additionally, all program signals can be heard directly in the
US2000A speaker or headset, and each program is output at the corresponding speaker jack on the back of the ES4000A. To
disable direct program listening for a program input, reset the appropriate jumper as show in Table 2 . Locations of the jumpers
are shown in Figure 2 on page 4.
Direct Program Listen Enable / Disable Jumpers
TABLE 2.
Jumper
J15
J16
J18
J21
Sidetone Trimmers
These trimmers are normally adjusted after all components are connected, and they can be access through the bottom cover
(Figure 15 on page 23). Refer to the US2000A User Manual for the sidetone adjustment procedure.
Mounting Configurations
The ES4000A can be used on a desktop, or it can be rack mounted. For desktop use, install the 4 rubber feet supplied with the
ES4000A. For rack mounting, use optional Audiocom RMK Rack Mount Kits (Figure 3 on page 8). Many configurations are
possible when using the kits. Examples are show in Figure 4 on page 9 and Figure 5 on page 10.
NOTE: When rack mounting components, you may not be able to access the sidetone trimmers after the components have
been mounted. In this case, you can position the components in the rack and make all required connections. Then, adjust the
sidetone trimmers before installing and tightening all rack mount screws.
Description
Program 3 direct to Headset or Speaker
Program 4 direct to Headset or Speaker
Program 5 direct to Headset or Speaker
Program 6 direct to Headset or Speaker
Settings for All Jumpers
Pins 2 & 3 Shorted: Enable
Pins 1 & 2 Shorted: Disable
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