Connecting Your Subwoofer
-7-
AV Receiver,
Integrated Amp,
Pre-Amp Or
Processor
Connections to a
If your pre-amplifier, receiver etc. has a
subwoofer output (often labeled LFE for
Low Frequency Effects), it can be
connected to the subwoofer's Left (Mono)
input as shown. This is the simplest and
recommended connection. A receiver with a
SUB / LFE output can be connected in the
same way.
The subwoofer will play the low frequency
range and the other speaker will play the
frequency range delivered to them by your
amplifier.
If you have a home theater pre-amplifier, it
may have an independent subwoofer
volume control. Make sure this is correctly
adjusted, and that the Earthquake
subwoofer's crossover frequency is set to
100Hz. This is by no means an iron-clad
rule, rather it is a good starting point.
You can set the subwoofer's Bass Level
control on your receiver to 0dB, and then
use the pre-amplifier's subwoofer level
control for normal and routine adjustments.
Connections To A Pre-amplifier
Using “Y” Cables
If your pre-amplifier does not have a
sub/LFE output, you can use “Y” cables to
send its main outputs to both the subwoofer
and your amplifier.
The subwoofer will play the low frequency
range and your front speakers will play the
full range.
Although bass is commonly distributed
evenly between left and right channels (L+R
bass), movie soundtracks often contain
differential (L-R) bass. The opening scene
in “Top Gun”, for example, has loads of L-R
bass information. If this is not preserved,
the bass in these scenes sounds anemic.
The Earthquake subwoofer utilized
differential gain on the left and right inputs
to retain both the L+R and L-R information.
Therefore, systems which do not have a
dedicated sub/LFE output should use both
the left and the right inputs as shown, for
the greatest bass impact.
AV Receiver,
Integrated Amplifier,
Pre-Amplifier Or
Processor Output
FF12 Amplifier Plate
SUB / LFE
OUT
R. SPKR
+ -
+ -
+ -
L. SPKR
CENTER
FF12 Amplifier Plate
PRE-AMPLIFIER
L
R
MAIN
OUTPUTS
+ -
AMPLIFIER
INPUTS
L
R
TO FRONT SPEAKERS
+ -
