S4/8 Owners Manual Ver 0.1
9
9
9
9
a b s o l u t e f i d e l i t y
™
terminal of your amplifier must be connected to the plus (+/red)
terminal on the back of the S4/8, and the negative (-) terminal to the
negative (-/white) terminal.
Using the high level inputs to feed the S4/8 power amplifier will not
degrade the sound quality of either your loudspeaker or the subwoofer.
Line-level connections
As an alternative, you can use the low-level inputs on the S4/8. Using
a high quality interconnect cable, connect your preamplifier’s output to
the low level inputs on the subwoofer labeled PRE AMP IN.
We strongly recommend that you do not use single-ended
interconnects longer than 10 feet (3.2 meters) to connect the
preamplifier outputs to your subwoofer. On many preamplifiers, using
an interconnect that is too long will negatively affect the performance of
your preamplifier because of the high capacitance of the interconnect
cable across the output of your preamplifier. This is why we provide
balanced inputs on the S4/8. Balanced interconnects can be as long
as you like.
If your preamplifier has only one set of balanced outputs and one set of
unbalanced (RCA) type outputs, choose your first preference of
connection for the amplifier that is driving your loudspeaker. Use the
remaining set of outputs to feed the S4/8’s amplifier.
Do not connect BOTH single-ended and balanced inputs to the S4/8 at
the same time. You could over-drive the built-in amplifier, and void the
warranty.
Phase Switch
If the subwoofer is out of phase with the speakers they are used to
augment, there will be some cancellation of the bass frequencies
where they overlap. Some speakers are designed to be phase
inverting (in particular those with 2
nd
order crossovers). There are also
many power amplifiers that invert the phase of the incoming signal.
Because there are so many possible combinations, we recommend
that you flip the switch between 0° and 180°. The correct position will
be apparent from the greater amount of low-frequency output of your
system.
If you have a phase inverting power amplifier and have inverted the
phase on the subwoofer, AND you are using both line-level and
speaker-level inputs, you must invert the phase of the speaker-level
