L-Acoustics 112XT - Using Xt with Subwoofers; Figure 16: L-ACOUSTICS Subwoofer Continuous Unweighted SPL Comparison; Table 12: L-ACOUSTICS Subwoofer Specification Summary

L-ACOUSTICS XT Manual V1.1 2/11/2003 34
SIDE FILL OR DRUM FILL MONITORING
When used in conjunction with SB115, SB118, SB218 or dV-SUB subwoofers, 112XT or 115XT
enclosures provide an excellent solution for side fill or drum fill monitoring. Single or two enclosure
stacked configurations are the most common set-up for these applications and the XT can also be
used without subwoofers depending on the amount of LF extension expected by the monitor
engineer or performing artist.
When stacked on top of vertically-oriented SB118 or SB218 subwoofers for side fill applications, XT
enclosures will physically be at a convenient height that is close to the performer’s ear level. Normally
for drum fill, subwoofers will be oriented horizontally in order to maintain a low profile.
Since the XT and its companion subwoofer are physically coupled for side fill or drum monitoring
applications, 3W presets are recommended since complimentary 100 Hz crossover filtering optimizes
the power bandwidth for the subwoofer and the 112XT or 115XT low section (please see Section 4.8
for further details).
4.8 USING XT WITH SUBWOOFERS
For most music applications, 112XT or 115XT enclosures should be used with SB115, SB118, SB218
or dV-SUB subwoofers. Issues involved in effectively using XT with subwoofers are discussed below
and as a reference, L-ACOUSTICS subwoofer specifications are summarized in Table 12 and Fig 14.
Table 12: L-ACOUSTICS Subwoofer Specification Summary
L-ACOUSTICS Freq Resp Usable LF Sensitivity RMS POW ER POW ER MAX SPL MAX SPL REC'D LOAD
SUB MODEL (+/- 3 dB) (-10 dB) (1W / 1m) Voltage (cont) (peak) (cont) (peak) AMP (ohms)
SB115 45 - 100 Hz 40 Hz 94 45
250 W 1000 W
120 dB 126 dB 500 W 8
SB118 35 - 100 Hz 32 Hz 97 70 600 W 2400 W 125 dB 131 dB 1200 W 8
SB218 28 - 140 Hz 25 Hz 100.5 68 1100 W 4400 W 130 dB 136 dB 2200 W 4
dV-SUB 40 - 200 Hz 35 Hz 104.5 57 1200 W 4800 W 133 dB 139 dB 2400 W 2.7
90.0
92.0
94.0
96.0
98.0
100.0
102.0
104.0
106.0
108.0
110.0
112.0
114.0
116.0
118.0
120.0
122.0
124.0
126.0
128.0
130.0
132.0
134.0
136.0
138.0
140.0
10 100 1000 10000
frequency (Hz)
dB SPL Continuous re: one source
SB118
SB115
dV
-
SUB
SB218
Figure 16: L-ACOUSTICS Subwoofer Continuous Unweighted SPL Comparison