L-Acoustics MTD Series User Manual

L-ACOUSTICS MTD Manual V1.2 11/30/2004 7
Loudspeaker focus or aiming can be adjusted so that maximum HF energy is directed towards the
farthest listening areas, therefore balancing the SPL attenuation with distance that occurs in the direct
field. At closer listening positions, the off-axis attenuation at higher frequencies provides a similar tonal
balance and the attenuation with distance is less.
The coaxial configuration therefore provides the optimum directivity required in order to obtain even
coverage and constant tonal balance in a typical semi-reverberant auditorium. Extensive sound design
and installation experience acquired by L-ACOUSTICS over the years confirms this and we are
confident that coaxial, axi-symmetric loudspeaker enclosures are the best tools for multiple source,
distributed sound design.
MTD108a, MTD112b and MTD115b loudspeaker enclosures provide the basic starting tools for
distributed sound reinforcement and, in fact, that’s what MTD stands for : M
ul-Ti-Distributed.
1. THE MTD SYSTEM
The MTD line consists of: MTD108a, MTD112b, MTD115b loudspeaker enclosures with their
respective analog line level controllers (MTD108 LLC, LLC112b-st, LLC115b-st or LLC115b-2w),
MTD rigging accessories and SB115, SB118 or SB218 subwoofers. Please note that amplifier racks plus
loudspeaker cables are not specified but should meet the minimum specification requirements
outlined below.
1.1 MTD SYSTEM COMPONENTS
LOUDSPEAKER ENCLOSURES
(1) MTD108a
Passive 2-way coaxial loudspeaker, containing 8” loudspeaker, 1” exit high frequency
compression driver with 100 degree axi-symmetrical coverage.
(2) MTD112b
Passive 2-way coaxial loudspeaker, containing 12” loudspeaker, 1.4” exit high frequency
compression driver with 85 degree axi-symmetrical coverage.
(3) MTD115b
Switchable active/passive 2-way coaxial loudspeaker, containing 15” loudspeaker, 1.4” exit high
frequency compression driver with 85 degree axi-symmetrical coverage.
SUBWOOFER ENCLOSURES
(4) SB115
Front-loaded, bass-reflex design, single 15’’ subwoofer for low frequency extension
(5) SB118
Dual bandpass-loaded, single 18’’ subwoofer for high level, extended bandwidth applications.
(6) SB218
Front-loaded, bass-reflex design, dual 18’’ subwoofer for high level, extended bandwidth
applications.
For more information concerning SB115, SB118 and SB218 subwoofer enclosures please consult the SB
Subwoofer User’s Manual

L-Acoustics MTD Series Specifications

General

Brand	L-Acoustics
Model	MTD Series
Category	Speakers
Language	English