Wisdom Audio Series S90i - Manual (Page 28)

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Making the S90i Connections
As with any system, you should make changes to the connections only when
the power is turned off to avoid any chance of inadvertently causing a problem
(such as a short-circuit).
We recommend using heavy-gauge speaker wire, particularly when the instal-
lation forces you to use longer wires than you might otherwise. A good rule of
thumb is to keep the “loop resistance” below 0.07 ohms.
The loop resistance can be easily measured with an inexpensive volt-ohm
meter. Simply twist the two conductors at one end of the cable together, and
then measure the DC resistance across the two conductors at the other end of
the speaker wire. Doing this measures the total resistance going down one side
and back the other, hence the term “loop resistance.” If this figure is at or below
0.07 ohms, you are in good shape.
For the purposes of this manual, we will assume that you have already con-
nected the SC-1 System Controller as per the instructions found in its manual.
As such, you should have signal coming from your source component(s) to a
preamp/processor that provides bass management (to create the subwoofer
channel(s), and then on to the SC-1; following the SC-1, the signal for the sub-
woofer is sent to a high quality amplifier such as the Wisdom Audio SA-series
amplifiers.
A “pigtail” connection is provided at one end of the S90i. Since the S90i fills a
standard 2 x 6 stud bay, the simplest thing is to drill a hole in one of the 2 x 6
studs and thread the pigtail through to the adjacent bay, where you have ample
room to make connections and run the wires.
Alternatively, the incoming signal can be routed directly into the small space
provided by the “feet” of the S90i, and the connection to the pigtail can be
make just prior to installing the S90i in the wall.
Connect the outputs of your Wisdom Audio SA-series amplifier to the subwoof-
er, taking care to get the polarity correct. Connect the positive (+) terminals on
the SA-series amplifier to the red wire in the pigtail; likewise, connect the nega-
tive (–) terminals on the amplifier to the black wire in the pigtail.
We recommend using wire nuts and then wrapping the resulting connection in
electrical tape to preclude any chance of the wire nut working loose over time.