Connecting your subwoofer – EarthQuake FF-12 User Manual

Page 7

Connecting Your Subwoofer

-7-

Low Level (RCA) Input Connection

1. Locate the LINE IN RCA on the FF12

amplifier.

2. Connect the FF12 to the signal source,

i.e. AV receiver. There is no need to
have both RCAs to the signal source
since the subwoofer is often operated in
mono signal. If the receiver does not
have adequate signal level, then you
may want to use both RCA inputs in
order to obtain higher signal level.

3. If needed, connect the LINE OUT RCA

to another amplifier to drive satellite
speakers (front or rear). The LINE OUT
RCA has high pass filtered signal at
about 70Hz (5dB/Octave cut off).

NOTE:

DO NOT USE HIGH LEVEL AND LOW
LEVEL INPUTS AT THE SAME TIME!

High Level (Speaker) Input
Connection

The FF12 has a HIGH LEVEL INPUT
connection. For the best performance,
you might consider RCA connection if it is
available on your source. If not, then high
level input will do.
1. Since bass is mono, you can connect

the high level input of any of the front
speakers to your FF12. For ease of
wiring, pick the speaker that is closest
to the subwoofer. Simply piggy back a
wire from the speaker to the subwoofer
and you’re up and running. Note: The
high level input for satellite speakers is
fitted with a high pass filter (70Hz). It is
only powered when the main or front
speaker signals are driven into the
HIGH LEVEL INPUT. These terminals
are marked with red and black to
indicate the (+) & (-) respectively.

2. Adjust the subwoofer low pass filter cut

off to near 100Hz at first, slowly bring
down the crossing point until you
eliminate any emanating vocals from
the subwoofer. An ideal crossing pint
range from 55 to 70Hz.

3. In case the FF12 becomes out of phase

with the satellite speaker, flip the phase
switch to correct the problem
(maximum bass is only achieved when
the sub is in phase with rest of your
speakers).

AUTO

SUB / LFE

OUT

L. SPKR

+ -

R. SPKR

CENTER

FF12 Amplifier
Plate

Amplifier or
Receiver