L-ACOUSTICS MTD Manual V1.2 11/30/2004 13
1.3 MTD108a SPECIFICATIONS
The MTD108a is a passive 2-way coaxial full range loudspeaker containing one 8-inch, direct radiating
low frequency component and one 1-inch titanium diaphragm, neodymium magnet, compression
driver. As a full range system, the frequency response is 85 - 20k Hz with less than ± 3 dB variation
and the usable bandwidth is 65 – 20k Hz (-10 dB). Sonic quality and the ratio of performance-to-size
were the chief design criteria for the MTD108a and its frequency response is exceptionally flat,
providing excellent fidelity and optimum speech intelligibility.
The MTD108a is ideal for distributed sound reinforcement in theatre, corporate, restaurant, retail,
club, or television (A/V) applications and is an excellent candidate for delay ring, front fill or under
balcony use. The ultra-compact format of the MTD108a allows for visually discrete installation in all of
these applications. The MTD108a is equally useful as a compact, high-efficiency floor monitor for
concert, theatre, dance, corporate or television applications. Given its superb fidelity and dynamic
response, the MTD108a is effective in situations that are typically unaccustomed to sound
reinforcement, in particular, for classical music and opera where high quality sound reinforcement is
essential.
The cone body of the 8” low frequency component provides pattern control loading of the
compression driver and yields a 100-degree (±15 degrees) conical directivity that is vertically,
horizontally and diagonally symmetrical (i.e., axi-symmetric). As implemented in the passive crossover
network, the crossover point between low and high sections is 2 kHz. Long term power handling
capacity is 250 Wrms at a nominal 8 ohm impedance and connection to the loudspeaker is made via
two parallel 4-pin Neutrik Speakon connectors.
For floor monitoring, the MTD108a has either 22.5° or 45° listening angles with respect to vertical for
short throw or long throw applications, respectively. Dimensions are 42.1 cm (16.6 in) high, 25.0 cm
(9.8 in) wide by 24.2 cm (9.5 in) deep and the weight is 10.5 kg (23.1 lbs). Cabinet construction
consists of 15 mm (0.6 in) and 18 mm (0.7 in) Baltic birch plywood with joints that are sealed,
screwed and rabbeted. The finish is maroon gray, high resiliency paint and the front of the
loudspeaker is protected by a black powder-coated 1.5 mm (0.06 in) thick steel grill that is covered
with 5 mm (0.2 in) thick acoustically transparent open cell foam.
The MTD108a has 4 integral rear attachment points for wall mounting using an optional Omnimount
rigging accessory along with a 36 mm (1.42 in) diameter pole mount socket for tripod mounting. An
integral top plate and the bottom pole mount socket also allows for rigging the MTD108a using the
optional ETR8 adjustable U bracket.
The L-ACOUSTICS MTD108LLCa is a stereo analog controller that provides optimum equalization
and band limiting for the MTD108a along with system protection and processing for use with
subwoofers. Active sense return monitoring guarantees safe operation and the controller provides
both thermal protection and cone excursion limiting.
Figure 3: MTD108a passive 2-way (8” LF + 1” HF) coaxial loudspeaker
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