6
Non-THX Low Level Connection
When connecting the ICS Sub 24 to
electronics that does not have a THX control
system, use the low level (also called line
level) connections whenever possible. Even if
you do not have a separate preamp and
power amp, many receivers and integrated
amplifiers include ”Preamp Out“ and
”Amplifier In“ connectors.
When using the low level connections, the
signal from the High Pass Outputs that is
returned to your amplifier is high pass filtered to remove sound below 80Hz. This is a non-adjustable filter. It is not
affected by the setting of the Crossover control. See the Fine Tuning section of this manual for more information.
Subwoofer Output Connection
Some electronics have monophonic subwoofer
outputs. If your system has this type of an output
it can be connected to either of the low level
inputs. The benefit of using this type of connec-
tion instead of using the THX input is that it does
not bypass the controls of the ICS Sub 24. You
can still use the level control to adjust the output
of the subwoofer. Typically such outputs are low
pass filtered, so you should set the ICS Sub 24
crossover control to it’s highest setting to
minimize its effect. If listening test show there is an excess of mid-bass sound you may want to use a lower crossover
control setting. See the “Fine-Tuning Your Subwoofer section for more information.
Warning:
To reduce the risk of electric shock, always switch off the subwoofer and the amplifier and or receiver when
making connections to the subwoofer and speakers.
THX® Input
Use this input when the ICS Sub 24 is connected
to a receiver or surround sound controller that
has a built-in THX control system. This input
bypasses
ALL
the crossover and control circuitry
of the ICS Sub 24.
C O N N E C T I O N
80 Hz
60 Hz
70 Hz
100 Hz
125 Hz
50 Hz
CROSSOVER
LOW LEVEL IN
L
R
HIGH PASS OUT
L
R
150 Hz
THX INPUT
Bypasses Crossover
THX Receiver
ICS Sub 24 Amp
SUB
OUT
80 Hz
60 Hz
70 Hz
100 Hz
125 Hz
50 Hz
CROSSOVER
LOW LEVEL IN
L
R
HIGH PASS OUT
L
R
150 Hz
THX INPUT
Bypasses Crossover
Amplifier, Receiver or
Preamp/Power Amp
ICS Sub 24 Amp
PREAMP
OUT
AMP
IN
L
R
80 Hz
60 Hz
70 Hz
100 Hz
125 Hz
50 Hz
CROSSOVER
LOW LEVEL IN
L
R
HIGH PASS OUT
L
R
150 Hz
THX INPUT
Bypasses Crossover
Amplifier, Receiver or
Preamp/Power Amp
ICS Sub 24 Amp
SUB
OUT
Either Input
May Be Used
7
High Level Connection
If the electronics in your system does not have Preamp Output/Power Amp Input connections, the ICS Sub 24 can be
connected via the speaker wiring using the “High Level” Connections. There are two methods for making high level
connections the ICS Sub 24.
The 5-way binding posts on the ICS Sub 24 permit easy connection to
banana plugs, spade lugs, and bare wire. If you are connecting bare wires
be sure to twist the wire strands into a neat bundle. Be sure there are no
loose strands that could touch another terminal and cause a short-
circuit.
NOTE:
When making high level connections be sure to maintain proper polarity - that is
c to + (positive) to (positive) and - to - (negative) to (negative). All wire has one of its
conductors marked in some way to make it easy to trace the connections. Typically there is a stripe
on the insulation or a rib molded into it. Or the insulation will be transparent and the wire strands of one conductor
will be copper colored and the other will be silver colored.
Preferred Connection Method
The preferred method for making high level
connections is to connect the speaker outputs of
your amplifier to the High Level inputs of the ICS
Sub 24, and then connect the main speakers to the
High Level Outputs. This is the best connection
method because the High Level Outputs are high
pass filtered - the low bass sound is removed. The
reduces the portion of the sound range the main
speakers must reproduce and makes it easier to
adjust the system for a smooth main speaker-to-
subwoofer transition.
ALWAYS ON
0
°
PHASE
180
°
HIGH LEVEL IN FROM AMP
L
+
–
R
+
–
HIGH LEVEL OUT TO MAIN SPEAKERS
AUTO ON
+
L
R
-
Amplifier, Receiver or
Preamp/Power Amp
