Snell Acoustics ICS Sub 24 C O N N E C T I O N, THX Input, Non-THX Low Level Connection

C O N N E C T I O N

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.

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.

THX Receiver

SUB

OUT

Amplifier, Receiver or Preamp/Power Amp

AMP PREAMP

IN OUT

L

R

ICS Sub 24 Amp

CROSSOVER	LOW LEVEL IN		HIGH PASS OUT
80 Hz	L	R	L	R

70 Hz	100 Hz
60 Hz	125 Hz
50 Hz	150 Hz

THX INPUT

Bypasses Crossover

ICS Sub 24 Amp

CROSSOVER	LOW LEVEL IN		HIGH PASS OUT
80 Hz	L	R	L	R

70 Hz	100 Hz
60 Hz	125 Hz
50 Hz	150 Hz

THX INPUT

Bypasses Crossover

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					ICS Sub 24 Amp
outputs. If your system has this type of an output		CROSSOVER		LOW LEVEL IN		HIGH PASS OUT
	Amplifier, Receiver or		80 Hz	L	R	L	R
		70 Hz	100 Hz
it can be connected to either of the low level	Preamp/Power Amp	60 Hz	125 Hz
inputs. The benefit of using this type of connec-		50 Hz	150 Hz
	SUB
tion instead of using the THX input is that it does	OUT				THX INPUT
					Bypasses Crossover
not bypass the controls of the ICS Sub 24. You
can still use the level control to adjust the output			Either Input
			May Be Used
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.

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