Specifications

(2) Using The APL-220, -500, and -800 with Subwoofers
To broaden the scope of applications for the APL-220, -500, and -800, they
can be used with an accompanying subwoofer, such as the Apogee APL-10,
APL-12, or APL-SB. A subwoofer is intended to extend the response of a full-
range system to a lower frequency than would be possible with the full-range
system alone. In some applications,the subwoofer is also intended to provide
more overall low-frequency power to create a punchier,more dramatic sonic
effect.
For many applications, a ratio of two, three, or four APL-220, -500, and -800s
to one subwoofer is a good starting point, however, the optimum ratio may
vary according to your specific needs, the style of music to be reproduced,
the acoustical conditions of the venue that the system will be operated in,
and the model of subwoofer.
If the full-range system already has substantial low-frequency capability, as do
the APL-220, -500, or -800, there will be a certain amount of overlap between
the full-range and subwoofer systems, causing an energy build-up in the over-
lap region. Depending on the desired results and the room acoustics, this
energy may or may not be beneficial.To avoid such a build-up, the APL-220,
-500, or -800 may be high-passed.
High-Passing the APL-220, -500, and -800
When used with a subwoofer, the APL-220, -500, or -800 can be high-passed
by means of a built-in, switchable Low-Cut filter, or by sending it a signal from
the high-pass output provided on an Apogee APL-Series powered subwoofer.
A high-pass output is also provided on Apogee non-powered processor-based
subwoofers and is available from Apogee’s CRQ-12 parametric equalizer.
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Figure 4
One example of a typical array.