SCS 178 CENTER - JBL Audio User Guide / Operation Manual. Page 4

The center channel speaker
should be placed slightly
behind the front left and right
speakers, and no more than
two feet above or below the
tweeters of the left and right

speakers. It is often convenient
to set the center speaker on
top of the television set, as
shown in the drawing. 

Separate and strip the ends of
the speaker wire as shown.
Speakers and electronics
terminals have corresponding
(+) and (–) terminals. Most
manufacturers of speakers and

electronics, including JBL, use
red to denote the (+) terminal
and black for the (–) terminal.
It is important to connect all
speakers identically: (+) on the
speaker to (+) on the amplifier
and (–) on the speaker to (–) on
the amplifier. Wiring “out of
phase” results in thin sound,
weak bass and a poor stereo
image.
With the advent of multi-
channel surround-sound
systems, connecting all of the
speakers in your system with
the correct polarity remains

equally important in order to
preserve the proper ambience
and directionality of the
program material.
Connect the JBL SCS 178
Center loudspeaker to the
center channel output of your
surround amplifier/receiver
with correct polarity, plus-to-
plus and minus-to-minus.