EAW SM-120-LR Specifications

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.