L-Acoustics MTD 112, Owner'S Manual

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MTD 112 18 06/97
4.1 THE MTD 112 ENCLOSURE
a) Technology
The technology of the MTD 112 is based on the two-way dual concentric type. The flare of
the L.F. cone loads directly the H.F. compression driver, hence allowing a true coaxial
axisymmetry of the wavefront generated both by the L.F. and H.F. drivers.(This is not the
case when a small horn is fitted inside the L.F. driver, the L.F. wavefront being splitted near
the cutoff frequency, producing off-axis cancellations).
The L.F. driver is of the 12" standard with a 4" flat wire copper voice coil.
The H.F. driver is of the 2" exit standard, reduced to 13/8 at the output of the phase plug.
The voice coil is of the 3" standard, and the diaphragm is made of titanium alloy. There is
provided a conical aluminum flare matching the internal vent of the driver magnet to achieve
a smooth continuity of the wave path to the edge of the L.F. cone.
The same magnet is used for the H.F. and L.F. drivers, being provided with two opposite air
gaps.
b) Specifications
Frequency response:
65 Hz - 18 kHz +/- 3 dB.
Nominal impedance: 8 Ohms on both ways
Minimum recommended amplification 300 Watts
Continuous maximum S.P.L. @ 1 m. 122 dB.
(measured in half-space, pink noise)
Nominal directivity
90°, conical
c) Measured frequency responses
c-1 : Amplitude/Frequency response (1m, input=2.83V )
.
4. TECHNOLOGY & SPECIFICATIONS
Front
Monitor
X-Over