L-Acoustics 108P, Руководство оператора

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L-ACOUSTICS P Series Manual V2.1 7/12/2007
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1.5 112P DESCRIPTION
The 112P is a self-powered, two-way, coaxial full range loudspeaker containing one direct radiating,
bass reflex-loaded, weather-resistant 12-inch low frequency transducer and one 1.4 inch exit, 3 inch
voice coil diameter, titanium alloy diaphragm compression driver. The cone body of the 12” low
frequency component provides pattern control loading for the compression driver and yields a 90-
degree conical directivity pattern that is axi-symmetrical. As a full range system, the frequency
response is 60 Hz to 18 kHz with less than ± 3 dB variation and the usable bandwidth is 50 Hz to 20
kHz (-10 dB).
The 112P contains internal digital signal processing electronics and a mono bridged power amplifier
that provides 1000 W continuous (1 kHz, 0.5% THD) into 8 ohms with thermal protection, short-
circuit/overload output protection, clip and RMS signal limiting. Integral digital signal processing
provides corrective component and system equalization. Four presets are selectable via rear-panel
push button switch with the following characteristics: FILL has nominally flat frequency response
when the loudspeaker is used under freefield conditions; FRONT has +3 dB low and high frequency
shelving characteristics under freefield conditions; MONITOR has nominally flat response under half-
space loading conditions; X-OVER provides a 100 Hz high pass filter and +3 dB high frequency
shelving characteristics for use of the 112P with the L-ACOUSTICS SB15P self-powered subwoofer.
Connection to the 112P is made via two parallel XLR connectors and gain is controllable via rear
panel volume potentiometer. AC power connectors are PowerCon type and 115V or 230V operation
can be selected via rear panel rotary switch.
The 112P has a truncated wedge shape with a curved front profile. Dimensions are 54 cm (21.3 in)
high, 41.6 cm (16.1 in) wide and 39 cm (15.4 in) deep. When used as a floor monitor, the front baffle
of the 112P is oriented at a 30 degree angle with respect to vertical. Enclosure weight is 32.2 kg (70.9
lbs) and cabinet construction consists of 30 mm (1.18 in) and 18 mm (0.70 in) Baltic birch plywood
with internal steel bracing and joints that are sealed, screwed and rabbeted. The finish is maroon-gray
high resilient paint and the front of the enclosure is protected by a black powder-coated, 1.5 mm
(0.06 in) thick steel grill covered with acoustically-transparent grille cloth.
The 112P has 36 mm (1.42 in) diameter pole mount sockets mounted on the top and bottom sides
that can be used with a U-bracket accessory for rigging the enclosure in either horizontal or vertical
orientations with angular adjustment at 10 degree resolution. The XTLIFTBAR accessory functions
with either of the pole mount sockets and provides five attachment points for rigging purposes.
Figure 12: 112P (floor monitor orientation)