Ambient Surround Speakers - JBL SCL-3 Owner's And Installer's Manual

If a non-perforated projection screen, plasma display or other fixed video device is being used in the installation, the
more compact alternative would be the SCL-3 model. Otherwise the SCL-4 could still be used in vertical orientation
and mounted directly below and as close as possible to the video display (See Figure 3). In either situation however,
the left and Right channel speakers may need to be lowered slightly to minimize the vertical positional difference. The
inverse of this mounting method will also work (center channel located above the screen or video display).
Figure 3
SCL-3: If you have purchased the compact SCL-3 model to use for the center channel speaker, be sure to position
it vertically (horn above or below the woofers) during installation in order to take advantage of its sound-dispersion
characteristics. If you mount it horizontally (horn to left or right of woofers), it will not provide the most optimized
dispersion pattern. Similar to the SCL-4 center channel installation, the SCL-3 horizontal "center" axis should be
aligned as close as possible to the center axis of the Left and Right channel speakers (See Figure 2).
If a non-perforated projection screen, plasma display or other fixed video device is being used in the installation, then
the recommended location as described above is directly below and as close as possible to the video display (See
Figure 3). Again, the inverse of this method will work also.
NOTE: It is extremely important to place the center, left and right speakers at the same height. The HDI horn
containing the high frequency compression driver in the center channel speaker should be no more than 2 feet higher
or lower than those in the left and right speakers. This preserves the "localization integrity" of "sound pans" in which
the sound appears to move from left to center to right. If the program material also appears to travel up and down, it
can destroy the illusion of panning effects and so should be avoided.

AMBIENT SURROUND SPEAKERS

Although it has been common for many years to use a number of surround speakers in commercial movie houses,
until recently, the traditional home theater configuration called for 5.1 channels. The newer surround formats that are
appearing in consumer audio equipment are calling for more complicated 6.1- and 7.1-channel systems now including
height channel locations. The advantages of using additional speakers are many. Additional channels enable a more
versatile use of directivity for a more accurate surround presentation. Also, a higher overall sound-pressure level can
be achieved with less energy expenditure from any individual speaker. Placement of the surround speakers remains
critical.
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