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system connections
The ACT 4 pre-amp processor is designed for simple,
reliable connections in a variety of system configurations.
Following the instructions below will ensure optimal
performance from your ACT 4 pre-amp processor.
IMPORTANT NOTE: Make system connections
with AC power disconnected.
HDMI Audio/Video Source Inputs
You may connect up to eight HDMI source devices to the
ACT 4 HDMI inputs i1 – i8. All HDMI inputs support 4K,
60Hz and therefore the use of high quality HDMI cables is
recommended. Avoid using excessively long cables (longer
than 25 feet), coiling or bunching up of cables. Input i1 can
be used to support the upcoming HDCP 2.2-compliant AV
source devices.
Coax Digital Audio Source Inputs
Use high quality RCA interconnects to connect up to three
coax digital audio source devices to ACT 4 inputs i12 – I14.
Avoid coiling or bunching up of cables. Be sure RCA cables
are fully inserted into ACT 4 input jacks in order to avoid
dropouts or other digital signal integrity problems.
Optical Digital Audio Source Inputs
Use high quality Toslink optical interconnects to connect up
to three optical digital audio source devices to ACT 4 inputs
i9 – i11. To prevent signal integrity problems or permanent
damage to optical cables, avoid tight turns or bundling.
Stereo (RCA) Audio Source Inputs
Use high quality RCA interconnects to connect up to four
analog audio source devices to ACT 4 stereo audio inputs
i17 - i20. Avoid coiling or bunching up of cables. Be sure
RCA cables are fully inserted into ACT 4 input jacks in order
to avoid hum and other analog signal integrity problems.
Stereo (XLR) Audio Source Input
Use high quality XLR interconnects to connect a stereo
analog audio source device to ACT 4 stereo audio input i16.
XLR cables will lock into the ACT 4 XLR input for a reliable
connection. Sources including stand-alone DACs, high-end
2-channel pre-amps, professional audio recorders and pro
studio mixing devices may be connected to this input.
Multichannel (RCA) Audio Source Inputs
The ACT 4 enables use of an external multi-channel audio
component with built-in surround decoding such as a blue-
ray player with built-in DACs. Use four pairs of high quality
RCA interconnects to connect such an external source
device (up to 7.1 output) to the ACT 4 multichannel input
i21. Be sure RCA cables are fully inserted into ACT 4 input
jacks in order to avoid hum and other analog signal integrity
problems.
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Document 1000905
Phono Audio Source Input
Use a high quality RCA interconnects to connect a turntable
to the ACT 4 phono input i15. Avoid coiling or bunching up
of cables. Be sure RCA cables are fully inserted into ACT 4
input jacks in order to avoid hum and other signal integrity
problems. A ground lug is included for cartridge hum
reduction.
Balanced or Unbalanced Audio Pre-amp Outputs
Use high quality RCA interconnects to connect external
power amplifiers. Avoid coiling or bunching up of cables. Be
sure RCA cables are fully inserted into ACT 4 output jacks in
order to avoid hum and other signal integrity problems.
Trigger In and Out Control
To enable automatic power on/standby control of the ACT 4
from an external control system or power conditioner,
connect a trigger cable from the trigger out of the controlling
device to the 3.5mm 12V trigger input on the ACT 4. The
ACT 4 trigger input jack is wired with its tip active and will
accept either a stereo or mono plug.
Similarly, to enable the ACT 4 to automatically control
external power amplifiers and/or send a power signal to an
external control system, connect one of the four trigger
outputs t1 – t4 to the device to be controlled via a trigger
cable for each slave device.
USB Power
Connect up to two USB-powered streaming media devices
or mobile devices to this pair of 5V USB power outputs.
Control Networks
Ethernet:
Ethernet Control (E2C), connect the Ethernet port to a
10/100 or faster home network router or switch port via a
standard CAT 5e or newer Ethernet cable. The network
activity indicator near the Ethernet jack illuminates green
when the ACT 4 is powered on and an active network
connection is detected.
This port may also be directly connected to a system
controller utilizing Ethernet command protocols (see section
"Ethernet Command Protocol".
RS-232:
system controller or computer using a 9-pin RS-232 serial
cable for full bi-directional control and monitoring of the unit.
Apply Mains (AC) Power
The ACT 4 is equipped with a high-quality 14 gauge, 3-
conductor power cord. Plug this cord into the back of the
pre-amp processor and then into a nearby AC outlet. Avoid
using any extension cords or plugging into other
components with rear-panel switched outlets.
Acurus ACT 4 pre-amp processor USER GUIDE
In order to take advantage of Acurus Enhanced
Connect the RS-232 port labelled "main" to a
Revision 20160608
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