Meyer Sound DS-2 User manual

Features
High power
Flat frequency response
Arrayable
Rugged
Long-term reliability
Applications
Main PA arrays
Concert reinforcement
Theater sound reinforcement
Live music clubs systems
DS-2
Mid-Bass
Loudspeaker
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
[phone]
FAX [phone]
The DS-2 is a high-power, arrayable
mid-bass unit designed to supplement
Meyer Sound MSL-3 and MSL-10A loud-
speaker systems in the 50-160 Hz range.
Optimized to perform in a wide range of
large-scale sound reinforcement applica-
tions, the DS-2 delivers high sound pres-
sure levels with extremely low distortion
and offers exceptionally controlled directiv-
ity.The system utilizes two proprietary 15-
inch cone drivers in a folded horn enclo-
sure braced with steel vertical reinforcing
rods. The horn features a hyperbolic flare
for maximum energy transfer with mini-
mum frequency response ripple. Its bal-
anced compression chamber presents a
symmetrical load to the drivers, providing
very high power handling. The rugged,
multiple-ply hardwood cabinet is fitted
with handles and, optionally, aircraft-style
rigging pan fittings.
The DS-2 requires a high-quality profes-
sional power amplifier capable of delivering
600 watts continuously into 4 ohms with a
signal voltage gain of 10 dB (minimum) to
32 dB (maximum), and can accommodate
up to 2500 watts burst power.
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Inches

DS-2 Specifications
Acoustical – DS-2 /D-2 System
1
Frequency response
2
50-160 Hz ±3 dB
Maximum SPL
3
Continuous 136 dB
Peak 148 dB
Sensitivity
4
112 dB
Coverage (-6dB points)
Horizontal 120 degrees
Vertical 120 degrees
DS-2 Loudspeaker
Transducers (2) MS-15 15-inch cone driver
Impedance
Nominal 4 ohms
Minimum 3.5 ohms real part, 0 ohms imaginary part, at 80 Hz
Maximum Safe Amplifier Swing 140 Vpk
Enclosure Folded horn, multi-ply Finnish birch
Finish Black textured or charcoal-grey carpet (optional)
Physical Dimensions 21
1
⁄4" W x 56
3
⁄4" H x 30" D
Weight 250 lbs (113.6 kg)
Protective Grill Expanded metal screen frame, vinyl damped,
charcoal-grey foam covering
Connector Cannon EP-4 male, EP-5 male (Europe only)
Rigging Aircraft pan fittings
D-2 Control Electronic Unit
Input Type
5
Balanced ISO-Input,
™
10k ohms, 5k ohms per leg
Output Type Active push-pull, 300 ohms output impedance
Maximum Input Level
Balanced +21 dBu
Unbalanced +21 dBu
Maximum Output Level
Balanced +26 dBu
Unbalanced +20 dBu
Hum and Noise
6
<-90 dBV
Dynamic Range
7
120 dB
Sense Inputs 100k ohms true differential, opto-isolated
Crossover Frequency
Upper 160 Hz
Lower (Mode switch in “DS-2 & Sub” position) 65 Hz
Driver Protection Circuitry RMS limiter, true excursion limiter
Indicators
Sense/Amplifier Gain Detect Green/Red LED
RMS Limiter, Excursion Limiter Red LEDs
Power Supply Green LED
Controls
Front Panel Input attenuator, AC power switch
Preset Panel Mode switch, sub polarity switch, DS-2 power control
Rear Panel Ground lift switch, AC range switches
Connectors
Balanced Input/Output 3-pin XLR (A-3) female/male (front panel input optional)
Sense Inputs Banana jacks (4 dual)
Power 100-120/200-240V AC, 50/60 Hz (rear-panel switchable)
Physical Dimensions 19" W x 1
3
⁄4" H x 7
3
⁄4" D, standard rack mount
Weight 8 lbs. (3.6 kg)
Note 1:
Acoustical specifications are
for the minimum configuration
of two DS-2 cabinets, and are
measured on axis at 2 meters
from 1/R image (located at cabi-
net rear).
Note 2:
Half-space conditions, pink
noise input, in third-
octave bands.
Note 3:
Loudspeaker driven with “A”-
weighted noise (peak-to-RMS
ratio
≈ 12 dB), with amplifier
rated at 600 W/channel at
4␣ohms. The DS-2 will accom-
modate amplifiers capable of
peak output levels up to
± 140␣Vpk.
Note 4:
Loudspeaker driven at 2 vrms
(1 watt @ 4 ohms).
Note 5:
ISO™ Input: Pins 1, 2 and 3
are transformer-isolated, and
shell is connected to chassis/
AC earth ground. Pin 3 positive
for positive pressure output.
Note 6:
“A”-weighted, unbalanced.
Note 7:
“A”-weighted noise floor to
maximum output.

D-2 Control Electronics Unit
analog OR condition, automatically tracks
the power amplifier with the greatest out-
put voltage swing to control the system
protection limiters.
Also provided is a switch-defeatable
crossover (Mode switch) and line-level out-
put to drive subwoofer systems, with a sub
polarity switch to facilitate aligning the
subwoofers with the main system. The sub
switches and other setup controls are lo-
cated behind a cover plate on the D-2 front
panel, providing a means for securing the
system installer’s presets.
The DS-2 loudspeaker operates as a
system with the D-2 Control Electronics
Unit (one per channel). Optimized for the
DS-2 and pre-aligned at the factory, the D-2
contains active crossover networks, fre-
quency response and phase response align-
ment circuitry, and Meyer Sound’s exclu-
sive SpeakerSense™ driver protection
circuitry, incorporating peak and RMS
signal limiting as well as excursion protec-
tion. A single-channel device operating at
line level, the D-2 is intended to be the
final component in the signal chain before
the power amplifier.
The D-2 SpeakerSense circuitry protects
the DS-2 loudspeaker components from
damage due to overheating or excessive
excursion under high power conditions.
This unique circuit continuously monitors
the power applied to the DS-2 drivers, and
limits the signal output when the safe oper-
ating areas of the drivers are exceeded.
Until the onset of overload, the Speaker-
Sense circuitry has no effect on the signal.
The D-2 SpeakerSense circuit incorpo-
rates Meyer Sound’s new MultiSense™
function, which allows the use of multiple
power amplifiers having different channel
gains and/or power ratings. The D-2 accom-
modates up to four amplifiers, and provides
separate Sense inputs for each. Its
MultiSense circuit, which implements an
Input Loop
∞
20
10 86543
2
1
0
Attn dB
UltraSeries™ D-2
Ex
RMS
Sense Limit
Power
DS-2 Only
Safe
Min Max
DS-2 Power
DS-2 & Sub 180 Polarity of
Sub Output
(to B-2A)
0
o
Mode
o
PUSH

Architectural and
Engineering Specifications DS-2/D-2
The mid-bass loudspeaker system shall
be of the folded-horn type with two 15"
cone loudspeakers in symmetrical compres-
sion chambers. The drivers shall be se-
curely mounted in the trapezoidal hard-
wood-plywood enclosure, and the loud-
speaker shall operate with a companion
Control Electronics Unit.
The Control Electronics Unit shall con-
tain a power supply capable of operating
from a 100-120/200-240V AC, 50/60 Hz
line, electronic crossover circuitry, RMS
limiters which protect the speakers from
overheating, true excursion limiters to pro-
tect the speakers from excessive excursion,
equalization circuitry, active balanced in-
put, indicator LED’s for power on and lim-
iters. A separate, switch-defeatable sub-
woofer output having switchable polarity
shall be provided. Total harmonic distor-
tion shall be less than 0.1%. The protection
limiters shall be controlled by sensing con-
nections to the power amplifier output, and
the Control Electronics Unit shall accom-
modate four separate amplifiers having dif-
fering gains and/or power ratings, with ana-
log OR circuitry to track the amplifier with
greatest output swing. “A” weighted noise
level shall be at least 90 dB below maxi-
mum rated output of +26 dBu.
Two speaker systems, when combined
with the Control Electronics Unit and a
power amplifier rated at 600 watts into
4␣ohms, shall meet the following criteria:
Frequency response, 50 to 160 Hz plus or
minus 3 dB measured with
1
⁄ 3 octave noise,
136 dB SPL of continuous pink noise out-
put at 1 meter and peaks of 148 dB SPL.
Speaker enclosure dimensions shall be
21
1
⁄ 4 W x 56
3
⁄ 4 " H x 30" D, weight 250 lbs
(113.6 kg).
Control Electronics Unit dimensions
shall be 19" W x 1
3
⁄ 4 " H x 7
3
⁄ 4 " D, weight 8
lbs (3.6 kg).
The horn loudspeaker system shall
be the Meyer Sound DS-2. The Control
Electronics Unit shall be the Meyer
Sound D-2.
Meyer Sound Laboratories has
devoted itself to designing,
manufacturing, and refining com-
ponents that deliver superb sonic
reproduction. Every part of every
component designed and built to
exacting specifications and
undergoes rigorous, comprehen-
sive testing in the laboratories.
Research remains an integral,
driving force behind all pro-
duction. Meyer strives for sound
quality that is predictable and
neutral over an extended lifetime
and across an extended range.
Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702
[phone]
FAX [phone]
© 1989 Meyer Sound 04.058.016.01A
Arraying Examples
Arrayed with MSL-10A
Minimum Configuration
Block of Four Units Arrayed with MSL-3