Wisdom Sage L75, Owner'S Manual

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11
Making the L75 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).
Two sets of speaker wires are required for each Sage L75 loudspeaker: one for
the woofer (low pass) section, and a separate one for the planar magnetic (high
pass) section that handles the midrange and treble.
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, and then on to the SC-1; following the SC-1, the signal is split
into low and high sections, with the low section going to one or more Wisdom
Audio SA-series amplifiers, and the high section going to another amplifier,
which will drive the planar magnetic panels.
We strongly recommend using spade, hook or ring lugs to terminate the speaker
wires whenever they are connected to the patented Cardas connectors, an ex-
ample of which is shown below. Wisdom Audio uses these connectors on both
our power amplifiers and on our freestanding loudspeakers.
Connect the outputs of your Wisdom Audio SA-series amplifier to the appropri-
ate woofer sections, taking care to get both the channel assignments and the
polarity correct. Connect the positive (+) terminals on the SA-series amplifier to
the positive (+) terminals for the woofer on the loudspeaker; likewise, connect
the negative (–) terminals on the amplifier and the speaker, respectively.
Next connect the outputs of your chosen amplifier for the midrange/treble to
the Sage L75 planar sections in a similar fashion, taking care with both channel
assignments and polarity.