EAW SM-120-LR User manual

Application
The SM-120-LR fulfills the intense need for a compact
stage foldback monitor enabling performers to hear the full
sonic production while being clearly intelligible at high sound
pressure levels. Its wide bandwidth and smooth response
make it ideally suited for many types of stage applications,
from simple voice foldback to complex vocal over
instrument monitoring.
Qualitatively, the SM-120-LR provides more gain
before feedback than the simple cone driver, tweeter based
monitors often used for foldback applications.
Description
The SM- 120-LR was designed to eliminate
compromises in mid-band and bass response that plague most
of the competitive monitors. Using rugged professional
quality EAW/RCF drivers and a carefully designed third order
equalized frequency dividing network, exceptionally smooth
response is achieved through the critical mid-band region.
This allows for superior gain before feedback and vocal
articulation as compared with simpler designs.
Physical design and implementation benefits from
EAW's years of touring concert equipment design
experience, offering minimum stage height for excellent sight
lines, four angle cabinet design for optimum
monitor/performance geometry and complete road
hardware including perforated steel speaker grill, feet and
recessed handles. The SM-120-LR uses the same 18 ply per
inch cross grain laminated baltic birch hardwood and black
polyurethane scuff-resistant coating as EAW's larger systems.
EAW's cabinets have acquired a reputation for being virtually
indestructible.
Mid/High Frequency
Performance
The SM-120-LR uses the CD-2552 compression
driver with a 17,500 gauss flux density magnetic structure
mated to an 1000 Hz exponential horn. This driver uses a
double suspension composite diaphragm for maximum
power handling and field reliability. The phasing plug and
compression chamber have been optimized to suppress the
inherently rising mid-band output, resulting in smooth
response to the 17,000 Hz region.
Frequency Dividing
Network
The crossover design of the SM-120-LR system is
third-order with 18 dB octave slope. This unit, with two
precision air core inductors, five percent capacitators and
resistors, costs twice as much as the simpler designs offered
in competitive, systems, but EAW crossovers eliminate the
measurable distortion that plagues the others. Ours have a
dynamic headroom of three times the system's power rating,
the greatest overload margin of any available crossover.
Low Frequency
Performance
Bass is provided by a 300mm (12") LF-300-R driver
mounted in a vented enclosure for clean output down to the
50 Hz region. The cast frame driver has a large magnet
providing 14,500 gauss flux in the gap for low distortion and
high efficiency. The rigid curveilinear cone is coupled to a
unique bifilar 75mm (Y) voice coil that exhibits excellent
diaphragm control at high power levels. Excellent bass
response unusual in a compact monitor makes it capable
of reproducing kick drum and bass guitar for important stage
rhythm.

SM-120-LR Specifications
Operating Range: 45 Hz to 18,000 Hz
Frequency Response
on axis ±3 dB: 58 Hz to 16,500 Hz
Sensitivity: 100 dB SPL 1 w at I m
Power Handling
Maximum: 250 w Program
Nominal: 150 w RMS
Maximum Output: 121.5 dB SPL 150w at 1m
Nominal Impedance: 8 ohms
Nominal Coverage Angle: 90' x 40 0 dependent on
horn mounting.
Enclosure Type: 90 liter vented box
Enclosure Volume: 50 litre (1.77 cu. ft.)
Construction Material: Cross-grain- laminated
Birch Hardwood
Crossover Network
Type: Third order, equalized
Frequency: 1,500 Hz
Driver Data LF Driver HF Driver
EAW Model: LF-30OR CD-2552
Diaphragm: 300mm(12") 52mm (2")
paper composit
Flux Density: 14,000 Gauss 17,500 Gauss
Voice Coil Diameter: 75mm (Y) 52mm (2")
Cabinet Dimensions: 15" x 23.75" x 14.25"
Weight: 70 lbs.
Cabinet Finish: Catalyzed Black Polyurathane
Driver Protection
Mechanical: Perforated Steel LF driver grill
Electrical: Individual Driver Fuses