cient to provide a 37 Hz low-
frequency limit (3 dB down)
without low-frequency lift (EQ).
This degree of low-frequency
extension is appropriate for
most contemporary music.
In the "step-down" mode,
the low-frequency limit of the
Xi-1191 drops to 27 Hz, plumb-
ing the depths of the very-low-
frequency range. This degree of
bass extension is unusual and
enhances many theatrical
effects. Step-down is achieved by
down-tuning the box to 28 Hz
with the supplied vent plug and
applying appropriate equaliza-
tion (in the loudspeaker
processing).
Special-purpose systems
Xi-Series
™
low-frequency and
subwoofer systems are
optimally vented designs
appropriate for single and
multiple use, flown or ground
mounted. All models feature
the renowned, 1,000-watt
(program) EVX-180B very-
low-frequency reproducer
with four-inch voice coil and a
peak-to-peak excursion ability
of nearly two inches! The
EVX-180B woofer is arguably
the world's most resistant to
mechanical fatigue.
(Mechanical fatigue, rather
than thermal overload, is the
chief cause of loudspeaker
failure in contemporary, high-
level music applications.)
Low-frequency and subwoofer systems
Xi-2122/42F: Two-way,
40° x 20° dual-12-inch
horn-loaded MB/HF
system
The Xi-2122/42F’s 40° x 20°
coverage pattern adds long-throw
"punch" to the capabilities of the
medium-throw 60° x 40° Xi-Series
™
systems. Its physical shell is iden-
tical to that of the Xi-1153/64
and Xi-1183/64, with its foot-
print matching that of the taller
Xi-2153/64 and Xi-2183/64.
The Xi-2122/42 operates above
125 Hz and would typically be
used with the low-frequency
augmentation provided by near-
by full-range or low-frequency
systems. Multiple Xi-2122/42’s
can be "fanned out" to form
a horizontal array for wide
horizontal and restricted vertical
coverage. Alternatively,
Xi-2122/42’s may be used in
vertical lines in medium-to-large
concert arrays.
Two DL-type 12-inch cone trans-
ducers are loaded into a large,
19-in. x 33-in. mid-bass horn
proportioned properly for the
40° x 20° coverage pattern. Dual,
vertically stacked DH6 HF drivers
mount on a “twin format”
40° x 20° horn, coaxially mount-
ed within the mid-bass horn.
Xi-1191 and Xi-1191F
subwoofers: One
EVX-180B 18-inch for
high output down to
27 Hz
The Xi-1191's single woofer faces
into a slotted chamber at the
bottom of the enclosure.
Compared to a conventional
direct radiator, this format
reduces distortion and increases
low-frequency efficiency at, and
slightly above, box tuning.
The Xi-1191's enclosure has been
optimized for subwoofer applica-
tion by placing a single 18-inch
transducer within it. Thus, in the
"normal mode" (box tuned to 37
Hz), enclosure volume is suffi-
Xi-2181 and Xi-2181F LF
systems: Dual EVX-180B
18-inch drivers for maxi-
mum output above 37 Hz
The Xi-2181 low-frequency
system places two EVX-180B’s in
an enclosure sized and tuned
identically to that of the single-
18-inch Xi-1191. Above 50 Hz,
this provides a maximum
acoustic output ability four times
that of the Xi-1191 (+6 dB),
making the Xi-2181 the more
efficient, highest-output-per-
cubic-foot approach to low-
frequency reproduction above
37 Hz.
(The single 18-inch Xi-1191,
described earlier, is still the
system of choice for high output
at very low frequencies. From
30-50 Hz, the Xi-1191 is about
3 dB more sensitive than the
Xi-2181.)
Xi-1082: Two-way,
90° x 40° ultracompact
underbalcony/low-
profile full-range system
The Xi-1082 is at home under
balconies and numerous other
medium-output applications
where vertical height is restrict-
ed. The single eight-inch woofer
(with RMD
™
) avoids the mid-
band lobing characteristic of the
dual, spaced woofers used in
conventional underbalcony
systems.
An Mb1082 U-bracket is
optional. Four inserts on the
back of the enclosure fit
OmniMount
®
Series 100
mounting ware.
*
*OmniMount is a registered trademark of
OmniMount Systems, Inc.
PAGE 6
“F” suffix indicates flying configuration.
Systems shown without grille.
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