L-Acoustics MTD Series User Manual

L-ACOUSTICS MTD Manual V1.2 11/30/2004 48
SIDE FILL OR DRUM FILL MONITORING
When used in conjunction with SB115, SB118 or SB218 subwoofers, MTD108a, MTD112b or
MTD115b enclosures provide an excellent solution for side fill or drum fill monitoring. Single or
double enclosure stacked configurations are the most common set-up for these applications and the
MTD 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, MTD
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.
For 3-way operation of MTD112b or MTD115b enclosures with SB115, SB118, or SB218 subwoofers
LLC processors should be set in X-OVER mode and the appropriate subwoofer model selected via
the front panel switches. For the MTD108LLCa analog controller, the subwoofer model is selected by
changing a jumper on the circuit board inside the unit (please see Section 5.6 for further details).
5.8 USING MTD WITH SUBWOOFERS
For extended bandwidth sound reinforcement, MTD108a, MTD112b or MTD115b enclosures should
be used with SB115, SB118, SB218 or dV-SUB subwoofers. As a quick reference, L-ACOUSTICS
subwoofer specifications are summarized in Table 17 and Fig 25.
Table 17: L-ACOUSTICS Subwoofer Specification Summary
L-ACOUSTICS Freq Resp Usable LF Sensitivity RMS POW ER POWER 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 25: L-ACOUSTICS Subwoofer Continuous Unweighted SPL Comparison

L-Acoustics MTD Series Specifications

General

Brand	L-Acoustics
Model	MTD Series
Category	Speakers
Language	English