The L-ACOUSTICS
®
MTD112b loud-
speaker enclosure and its accompa-
nying analog controller provide a
highly versatile system that is designed
for distributed sound reinforcement.
Intended for medium-scale touring,
sub-hire or fixed installation, the
MTD112b features proven compo-
nents that are compatible with
previous generation MTD enclosures
while also benefiting from the econo-
my, packaging and "plug and play" ease
of use afforded by it's companion
LLC112b-st stereo line level analog
controller.
The MTD112b is a passive 2-way
loudspeaker enclosure containing a
1.4" exit compression driver that is
directly loaded by the 12"
loudspeaker in a coaxial configuration.
Advantages of the coaxial approach
include: single point source radiation
and excellent phase response, total
wavefront coherency at all frequencies
and axi-symmetrical directivity that
produces identical horizontal and
vertical coverage. Coaxial design also
provides LF/HF superimposed disper-
sion characteristics that are free of
polar lobing effects typical of traditio-
nal horn and woofer combinations.
The end result is natural, studio
monitor level sound quality, ideal for
proximity use and perfectly matching
semi-reverberant environments.
The MTD112b is designed for distri-
buted sound reinforcement and can
also be used in medium power front-
of-house (FOH) applications for
theatres, clubs, multi-purpose venues
or corporate events. Examples of
distributed systems include delay rings
for large-scale installations, surround
effects channels for theatre or multi-
media, distributed reinforcement for
sports venues and delays for speech
reinforcement in convention centre
ballrooms. Due to its compact, wedge-
shaped format, axi-symmetrical
directivity and full range passive design,
the MTD112b also provides a
cost-effective floor monitor solution
for live sound reinforcement. When
used with additional subwoofers such
as the SB115, SB118 or SB218, the
MTD112b can be used in side fill or
drum monitoring applications.
The L-ACOUSTICS LLC112b-st is a
dedicated stereo analog controller that
provides optimum processing and
sense return protection for the
MTD112b. Front panel design of the
LLC112b-st allows the unit to function
as a patch panel, providing an ergono-
mic, cost-effective solution for
amplifier rack packaging.
A pole mount socket and single stud
anchor plate are included as standard
on the MTD112b and the enclosure is
Omnimount-ready. An adjustable
U-bracket is available as an optional
rigging accessory for ceiling, wall or
scaffold mounting.
L-ACOUSTICS specifications are based on measurement procedures which produce unbiased results and allow for realistic performance prediction and simulation.
Some of these specifications will appear very conservative when compared with other manufacturer’s specifications. All measurements are conducted under free
field conditions and scaled to a 1 m reference distance unless otherwise indicated.
Frequency Response
Frequency response 70 - 14k Hz (±3 dB) (LLC FRONT position)
Usable bandwidth 55 - 16k Hz (-10 dB)
Sensitivity
1
(2.83 Vrms @ 1m) 98 dB SPL 70 - 14k Hz
Power Rating
2
Amplification* Impedance
(Long Term) (Recommended) (Nominal)
45 Vrms 250 Wrms 1000 Wpeak 500 W 8 ohms
*Amplifiers must have 32 dB gain in order for LLC112b-st sense return protection to function properly
Nominal Directivity
(-6dB)
3
Axi-symmetrical 85° (± 20°)
System Output
4
SPL
One enclosure 120.5 dB (cont) 126.5 dB (peak) FRONT mode
122.5 dB (cont) 128.5 dB (peak) X-OVER mode
FRONT LLC setting provides a 3 dB low frequency contour under freefield conditions
X-OVER LLC setting applies a 100 Hz high pass filter
Components
LF 1 x 12'' weather resistant loudspeaker (4'' voice coil)
HF 1 x 1.4'' exit compression driver (titanium diaphragm, 3" voice coil, coaxial assembly)
Enclosure
•Height 540 mm 21.3 in
•Front Width 410 mm 16.1 in
•Rear Width 165 mm 6.5 in
•Depth 375 mm 14.8 in
•Trap Angle 45 degrees with
respect to vertical
•Net Weight 27.5 kg 60.6 lbs
•Shipping Weight 30.5 kg 67.2 lbs
•Shipping Dims 615 x 470 x 465 mm
24.2 x 18.5 x 18.3 in
•Connectors : 2x 4-pin Neutrik speakon
• Material : 18 mm, 30 mm Baltic birch plywood
•Finish : Maroon-gray™
•Grill : Black epoxy perforated steel with
acoustically transparent foam
•Rigging : Integrated flying hardware,
handles and pole mount socket,
Omnimount-ready
Additional Equipment
• L-ACOUSTICS LLC112b-st analog controller
•L-ACOUSTICS SB115, SB118, SB218
subwoofers
•L-ACOUSTICS LA 15a, LA 17a or LA 24a
power amplifier
1
Sensitivity is the average SPL measured over the com-
ponent’s rated bandwidth
2
Power rating displays the long term RMS power handling
capacity using pink noise with a 6 dB crest factor over the
component’s rated bandwidth
3
Directivity is averaged over the 1-10 kHz range
4
System Output gives the unweighted SPL output of the sys-
tem referenced to 1 m, including preset equalization and band
leveling adjustment as measured under freefield conditions.
L-ACOUSTICS
®
is a registered trademark
COAXIAL
TECHNOLOGY
MMTTDD111122bb
Passive two-way enclosure
(12" LF, 1.4" HF)
High power coaxial
driver assembly
Point source radiation
(85° conical directivity)
Flexible format for
distributed sound
reinforcement
Wedge-shaped for floor
monitor use
Suitable for medium-
power FOH applications
Designed for both fixed
installation and touring
Compact, rugged
construction,
flexible rigging
Analog processor
control with sense
return protection
(32 pages)
(152 pages)
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