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O P T I M I Z I N G T H E S O U N D , S Y S T E M A D J U S T M E N T S
Probably the most unique feature of the XA Reference
Tower is its total adjustability via a number of band trim
switches and through 3 bass port options. At Snell, our
experience with installing and optimizing our systems into a
variety of homes has taught us the value of fine adjust-
ments to a speaker's balance to suit both the acoustics of
the room and the characteristics of allied equipment.
To do this we have split the sonic spectrum up into 4
sections. Each section has an electrical switch with 3 subtly
different setting. The bass then has three port tuning
options and there are three settings for the ambience-
increasing rear tweeter. In the following section we will
describe what to listen for in each band and how to adjust
them for optimum performance.
First please note that all adjustments are subtle with
approximately 1.5dB difference per position. No combina-
tion of settings of the rear panel switches can make the XA
Reference sound bad. Also note that it is acceptable to
leave them all in their middle position as this will give the
flattest balance in a very good room with very neutral
electronics. We just feel that, with a little patience and
experimentation, that an even better performance is
achievable in most case with judicious adjustment of the
various controls.
Low frequencies are adjusted via 3 optional port assem-
blies that are bolted into the rear of the cabinet. These
assemblies give two tuning frequencies (24 and 36 Hz) and
a sealed plate will convert the system to a non-vented
enclosure. The system is shipped with the long port
assembly (24 Hz). This will give the flattest and most
extended bass response and is often the best choice for a
full range system with no subwoofer. The blanking plate (no
ports) will give a tighter bass character with less weight but
more speed. The sealed option is probably best when using a
subwoofer. Crossover blending between the towers and subs
will probably be made easier with the lower order roll off
and softer corner that the blanking plate will provide.
This is the system response graphic that appears on the input/
control panel of the XA Reference. NOTE: The switch settings are
for example only. They are not necessarily a recommended setting.
2. Replace the
ports with the
solid plate or the
other port set.
– continued
1. Remove the six screws
that hold the ports in place
3. Replace the six screws.
Tighten them gradually in a
star pattern until each is firmly
set. Do not over tighten.
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