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9
Installation using line level inputs
A) Using a preamp or receiver with line level outputs.
If a preamplifier output is available on your receiver, or you have a
preamplifier, connect it to the stereo line level RCA type input jacks on your
subwoofer. Use quality shielded cables and connectors. Connect one
set of shielded cables from the preamplifier output to the subwoofer input.
Connect a second set of cables from the subwoofer outputs to the input of
the power amplifier for your main stereo speakers. Refer to Figure D.
Note: Do not use the tape monitor output from your receiver or preamplifier
because its signal level will not vary with the setting of the preamp volume
control.
EXPLANATION OF FEATURES AND CONTROLS
Refer to Figure A.
1) Polarity switch: This two position switch allows the best match of
acoustic output between the subwoofer and the main stereo speakers
in the region of the crossover frequency between them. The “normal”
position maintains phase from input to output, the “reverse” position
changes polarity or phase by 180 degrees.
2) Power switch: This three position switch controls the power status of
the subwoofer.
Off: Turns the unit off.
Auto: Places the unit in the standby mode, in this mode the subwoofer will
automatically turn on when an audio signal is applied to either the high or
low level inputs.
On: Turns the unit on regardless of whether a signal is present or not.
3) Subwoofer crossover : This rotary control adjusts a variable low pass
filter to set the upper frequency at which the output of the subwoofer
begins to roll-off. Continuously variable from 60 Hz to 160 Hz, it matches
the upper frequency characteristics of the subwoofer to the low frequency
response of the main stereo speakers.
4) Line level output: These RCA phono jacks provide a line level, stereo
output that tracks the level of the full range signal at the line level or
speaker level input. This output is provided for those wishing to “bi-amplify”
their main stereo speakers.
5) Line level input: These RCA phono jacks accept a line level full range
signal from the preamplifier output of a receiver or preamplifier. This full
range signal is processed and amplified to power the subwoofer.
6) Speaker level input: These spring loaded terminals for speaker wire
accept a stereo, speaker level, full range signal from a receiver or
power amplifier. This signal is processed and amplified to power the
subwoofer.
7) Fuse: For continued protection replace fuse with same type and size
listed.
8) Level control: This rotary control adjusts the level of the subwoofer and
is used to balance its volume with that of the main stereo speakers.
9) Status LED: This two color light emitting diode shows the status of
the subwoofer electronics. “Red” indicates that the amplifier is plugged
in and the power switch is either off or in standby mode with no input
signal present. “Green” indicates that the amplifier is operating with signal
present at the input from the preamplifier, receiver, or power amplifier.
4
FIGURE D
- +
Right
Speaker
Left
Speaker
Power Amplifie
r
+ -
R
- +
L
+
-
INPUT
R
L
OUTPUT
Preamplifier