S15M
Floor Monitor
• PRO™ circuit provides HF driver
protection
• Constant-directivity 80° x 55° horn
• Usable monitor angles of 50° and 65°
• 250-watt long-term rms power
capacity
• Roadworthy enclosure with metal
corners, a metal grille and a
durable black carpet finish
• Dual 1/4-inch phone jack or dual
Neutrik Speakon
®
inputs
1
1
See Connections section
Description
The Electro-Voice S15M is a 250-watt, two-
way, high-efficiency, constant-directivity
stage floor monitor system, featuring a
vented, direct-radiating woofer section.
Possible system orientations are 50°, 65°,
and perpendicular to the floor. It combines
professional-quality Electro-Voice compo-
nents arranged in a vertical array with an
unusually durable, lightweight enclosure.
The result is wide-range accurate sound re-
production with transparent highs and ex-
tended bass response.
The high-frequency section of the S15M uti-
lizes an 80° x 55° constant-directivity horn
driven by a one-inch throat, wide-bandwidth,
titanium-diaphragm driver. The DH2010A
high-frequency compression driver uses a
unique, convex-drive Time Path
™
phasing
plug structure (U.S. Patent #4,525,604) for
smooth and extended high-frequency perfor-
mance. The voice coil is coupled to the dia-
phragm with EV’s exclusive Resonant
Drive™ Technology. This increases and
smooths the high-frequency response and re-
duces the amount of internal equalization
required for flat frequency response.
Driver output extends to 20,000 Hz.
A self-resetting high-frequency protection
circuit, EV’s PRO™ circuit, is included with
the S15M to prevent against accidental over-
drive and improve system reliability. If the
input power to the high-frequency driver
exceeds the nominal rating, the protection
circuit is activated and reduces the power
delivered to the driver by 6 dB. The system
will remain in this mode of operation until
the input power is reduced to a safe level.
The bass section of the S15M is designed
using Thiele-Small parameters for solid per-
formance to 77 Hz. The 381-mm (15-in.)
SG15 woofer used is a specially designed
unit featuring an extended-length voice coil
and high-temperature construction materials.
The system combines professional-quality
components arranged in an unusually durable
Thiele-Small-aligned vented enclosure. The
result is clear and articulate, high-quality
sound.
Speaker Protection
The S15M, like all other vented systems,
experiences rapidly increasing cone excur-
sion below the box-tuning frequency, while
the acoustic output decreases rapidly. There-
fore, to protect the S15M and maximize the
power output of the system, it is necessary
to insert an active 45- to 80-Hz high-pass
filter into the circuit. The filter should have
a slope of at least 12 dB per octave. Such
subpassband filters are found in many cross-
overs and equalizers manufactured by
Electro-Voice, as well as other commercially
available equipment.
Enclosure Construction
The S15M enclosure is constructed of Road-
Wood™, a structural material that combines
the strength of high-quality plywood with the
density and acoustic damping of particle
board without brittleness. Road-Wood™
uses the same principle of crossbanding ve-
neers, as in plywood, in order to achieve its
very high rigidity. A tough liquid-phenolic
resin is blended with long, narrow strands
of hardwood. Alternate layers are perpen-
dicularly bonded under intense heat and
pressure to form panels of superior unifor-
mity. Unlike many grades of plywood,
Road-Wood™ is dimensionally stable,
water resistant and free from voids.
A combination of dado-cut joints and tough
adhesives ensure a sonically dead enclosure
free from panel resonances.
The densely woven, industrial-grade, abuse-
resistant carpeting provides a finish that is
both attractive and highly durable. Heavy-
duty metal corner protectors, firmly secured
rubber feet, recessed handles and a protec-