L-Acoustics MTD Series, Руководство оператора

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L-ACOUSTICS MTD Manual V1.2 11/30/2004
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1.2 MTD OVERVIEW
L-ACOUSTICS MTD108a, MTD112b and MTD115b loudspeaker enclosures along with their
respective analog controllers provide highly versatile, multi-purpose systems that are designed for
distributed sound reinforcement. Intended for medium-scale touring, sub-hire or fixed installation, the
MTD line of enclosures benefit from the economy, packaging and “plug and play” ease of use afforded
by their companion LLC analog line level controllers.
The MTD108a is a passive 2-way loudspeaker containing a 1” neodymium compression driver that is
directly loaded by the 8” loudspeaker in a coaxial configuration. The MTD112b is a passive 2-way
loudspeaker containing a 1.4" exit compression driver and 12" loudspeaker in a coaxial configuration
while the MTD115b is switchable active/passive and features a 15” loudspeaker plus 1.4" exit
compression driver. As discussed in the introduction, 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 dispersion characteristics that are free of polar
lobing effects typical of traditional 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 MTD108a, MTD112b or MTD115b are ideal for distributed 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 multimedia, distributed reinforcement for sports venues, and
delays for speech reinforcement in convention centre ballrooms. Due to their compact, wedge-
shaped format, axi-symmetrical directivity and full range passive design, MTD enclosures also provide
a cost-effective, high performance floor monitor solution for live sound reinforcement. When used
with additional subwoofers such as the SB115, SB118 or SB218, the MTD line of enclosures can also
be used for side fill or drum monitoring applications.
The L-ACOUSTICS MTD108LLCa, LLC112b-st, LLC115b-st and LLC115b-2w are dedicated analog
controllers that provide optimum signal processing and protection for the MTD108a, MTD112b,
MTD115b (passive mode) and MTD115b (active mode), respectively. Active sense return monitoring
guarantees safe system operation with LLC controllers providing both thermal protection and cone
excursion limiting. LLC controllers also generate a subwoofer feed with switchable high pass filtering
and equalization for use with SB115, SB118 or SB218 subwoofers. Front panel design also allows LLC
controllers to function as a patch panel, providing an ergonomic, cost-effective solution for amplifier
rack packaging.
Pole mount sockets are included as standard and all MTD enclosures are Omnimount-ready.
Adjustable U-brackets are available as optional rigging accessories, allowing MTD enclosures to be
ceiling-, wall- or scaffold-mounted. As standard on the MTD112b and MTD115b, single stud anchor
plates are included for installation of a safety steel using the optional PION1 (single stud Aeroquip
flytrack fitting-to-ring) accessory.