Electro-Voice Deltamax System DML-1152A User manual

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Eleciro-Voice'
THE DELTAMAX™ SYSTEM
OWNER'S MANUAL
DMC 1152B CONTROLLER
DML-1152A/DML-1152MC LOUDSPEAKERS

THE DELTAMAX™ SYSTEM
DESCRIPTION
GENERAL
The DeltaMax™ DMC-1152B/DML-1 152A and
DMC-1152B/DML-1152MC systems consist of two-
way biamped, high-performance speaker systems
and companion electronic controllers. The DML-
1152A is a full-range loudspeaker system intended
for high-level sound reinforcement in touring-sound
and permanent-installation applications. The trap-
ezoidal cabinet shape allows tight cluster designs,
enabling maximum mutual coupling and single-
point-source arrays. The DML-1152MC is a slant-
monitor version of the DML-1152A. The unique
circuitry of the DMC controller provides accurate
protection for the loudspeakers without the use of
shifting high-pass or low-pass filters, shifting cross-
over frequencies or independent bandpass com-
pression. The electronic protection is invoked only
when catastrophic conditions are present for the
loudspeakers. The result is that accurate fre-
quency response is maintained from the lowest
sound pressure levels to the very highest sound
pressure levels available from the loudspeakers.
There are two models in the ОМІ 11524 series:
the DML-1152AP (painted finish) and the
DML-1152APF (painted finish with flying hardware).
The DML-1152MC model is a carpet-covered slant-
monitor version of the DML-1152A and does not
have a flying hardware option.
The DML-1152A and DML-1152MC employ a
15-inch woofer for low-frequency reproduction, and
a standard 2-inch-exit DH1A compression driver.
The systems use flat-front, constant-directivity,
high-frequency homs which are based on the
Electro-Voice HP series (Patent $4,685,532) and
are geometrically optimized for performance from
1,250 Hz to 20,000 Hz.
The DeltaMax™ flying version model
DML-1152APF includes three steel-reinforced
aircraft-type pan fittings on the top and bottom of
the enclosures to facilitate the hanging of multi-
cabinet arrays. Each DeltaMax™ flying system is
packed with a separate owner's manual which pro-
vides specific hanging instructions.
The electronic circuits are designed to provide
optimum audio performance, even when the audio
drive level is increased for maximum loudness.
Precise speaker modeling circuits control a high-
performance compressor and voltage limiter which
provide speaker excursion protection, voice-coil
temperature protection, and amplifier maximum-
power limiting.
Where very high levels of deep bass are required,
the DMC-2181S/DML-2181A DeltaMax™ subwoof-
er system may be added to the DMC-1152B/
DML-11524 or the DMC-1152B/DML-1152MC
combinations. The DML-2181A loudspeaker cabi-
net, with two manifolded eighteen-inch speakers,
Description
and the DMC-2181 series electronic controllers
were designed specifically to work in conjunction
with the two-way systems to provide extremely
high-level low-frequency output down to 35 Hz.
Optimum performance of these speakers can only
be assured when used with their dedicated elec-
tronics. Do not use with other electronic cross-
overs and/or processors.
NOTE: The performance of the DML-1152MC
slant-monitor system is identical to the
DML-1152A series speaker systems. Henceforth,
throughout this manual all references to the
DML-11524 series will be assumed to include the
DML-1152MC.
FEATURE SUMMARY
Fourth-order Linkwitz-Riley crossover filters
provide smooth, accurate response through the
crossover region.
Special equalization circuits allow flat, wideband
system response.
Sensing circuits for the drivers control the com-
pressor and voltage limiter to prevent voice-coil
overheating, overexcursion and amplifier slipping
without affecting spectral balance or
program dynamics.
Dual-time constant compressor circuit with
variable compression ratio reduces peak
and average levels for loudspeaker thermal
protection and amplifier clipping prevention as
necessary while preserving relative program
dynamics.
* Voltage-clamp loudspeaker excursion protection
does not alter overall program dynamics or fre-
quency response.
A connection to the control voltage is available
through a jack on the back panel. This allows
precise gain tracking when more than one unit is
used.
The front panel display shows drive signal level
and compressor gain reduction. Sensing display
for each sense channel shows amplifier limit, ex-
cursion limit, and temperature limit. When its
limit is approached, each LED lights yellow.
Speaker system is trapezoidal for compact ar-
rays. Flying versions feature integral, steel-rein-
forced fittings to facilitate hanging.
Both the woofer and the compression driver em-
ploy the best available technology for high power
and accurate sound reproduction.
A state-of-the-art, flat-front, constant-directivity
horn is utilized for even coverage and flat re-
sponse.
page 1

THE DELTAMAX™ SYSTEM
Specifications
CONTROLLER SPECIFICATIONS
CHANNEL CONFIGURATIONS:
Monoaural two-way; two sense channels
FILTER TYPE:
4th-order Linkwitz-Riley
CROSSOVER FREQUENCY:
1,100 Hz
GAIN:
5 dB nominal
SIGNAL PATH EQUALIZATION (see Figure 1),
LF EQ:
-3 dB at 33 Hz, +10 dB at 55 Hz
LF Signal Delay:
0.49 ms at crossover frequency
HF EQ:
4th order optimized for DML-1152A series
HF driver and horn
TOTAL HARMONIC DISTORTION, 20 - 20,000 Hz:
0.03% typical, 0.1% maximum
NOISE, EACH OUTPUT, 20 - 20,000 Hz NBW,
TYPICAL:
-86 dBu
Electronically balanced differential
Maximum Level:
+18 dBu
Impedance:
27,000 ohms and .0015mf
CMRR, Typical:
—55 dB
Connector:
Female 3-pin XLR-type
SENSE CHANNEL INPUTS,
Type:
Floating differential
Maximum Level,
LF: 145 V rms
HF: 145 V rms
Impedance:
100 kilohms each side to ground
Connector:
Two five-way binding posts
OUTPUTS (LF and HF):
Type:
Transformer floating differential
Maximum Level:
+18 dBu
Minimum Load Impedance for Full Level:
600 ohms
Connectors:
Male 3-pin XLR-type
POWER REQUIREMENTS:
100, 120, 220, 240 V ac, 50 - 60 Hz, 13 W
CHASSIS CONSTRUCTION:
Painted steel
COLORS:
Gray front panel/black chassis with white graphics
MOUNTING:
EIA 19-inch rack mount, 1.75 in. high, 8.97 in.
behind panel (including connectors); supplied
with front-panel security cover for controls.
SYSTEM SPECIFICATIONS
Frequency Response, Measured in Farfield,
Calculated to One Meter on Axis, Swept One-Third-
Octave Pink Noise, One Watt into LF Midband
(2.83 V at 250 Hz), Anechoic Environment, +3 dB
(see Figure 2):
50-20,000 Hz
Sound Pressure Level at One Meter, One Watt
Input Power, Anechoic Environment, Band-Limited
Pink-Noise Signal,
High Frequency:
112 dB
Low Frequency:
100 dB
Typical System Maximum Continuous Sound
Pressure Levels at One Meter, Anechoic
Environment:
126 dB
Typical System Maximum Peak Sound Pressure
Levels at One Meter, Anechoic Environment:
132 dB
Crossover Frequency:
1,100 Hz
Beamwidth Angle Included by 6-dB-Down Points
on Polar Responses, Indicated One-Third-Octave
Bands of Pink Noise (see Figure 4),
1.2-20 kHz Horizontal:
60° (+25°, -5°)
1.2-20 kHz Vertical:
40° (+25°, -5°)
Directivity Factor R, (Q) 1.0-20 kHz Median
(see Figure 5):
19.3 (412.8, —7.3)
Directivity Index D, 1.0-20 kHz Median
(see Figure 5):
12.1 dB (+3.0 dB, -1.3 dB)
Distortion, 120 dB SPL at 1 Meter,
Shaped Spectrum (see Figure 6),
Second Harmonic
100 Hz:
4.396
800 Hz:
1.096
Third Harmonic
100 Hz:
0.7%
800 Hz:
1.4%
2,000 Hz:
0.796
5,000 Hz:
1.796

THE DELTAMAX™ SYSTEM Specifications
з SPEAKER SPECIFICATIONS
Transducer Complement,
High Frequency:
DH1A compression driver (2-inch exit)
Low Frequency:
DL15X 15-inch woofer
Efficiency,
High Frequency:
2596
Low Frequency:
5.0%
Long-Term Average Power Handling Capacity,
High Frequency (per AES2-1984):
75 watts
Low Frequency (per ЕА RS-426A):
400 watts
Short-Term Power Handling Capacity,
High Frequency:
300 watts
Low Frequency:
1,600 watts
Maximum Long-Term Midband Acoustic Output,
High Frequency:
18.8 watts
Low Frequency:
20.0 watts
Nominal Impedance,
High Frequency:
8 ohms
Low Frequency:
8 ohms
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FIGURE 1 - DMC-1152B Frequency Response
Minimum Impedance,
High Frequency:
6.5 ohms
Low Frequency:
7.9 ohms
Dimensions,
Height:
75.9 cm (29.88 in.)
Width:
45.2 cm (17.78 in.)
Depth:
41.4 cm (16.28 in.)
Net Weight:
43.3 kg (96 Ib)
Shipping Weight:
47.4 kg (105 Ib)
Enclosure Materials,
Structural:
3/s-inch 14-ply birch plywood
Finish:
Black textured paint
Grille:
Steel with charcoal-gray foam
Hanging (DML-1152APF only):
3-point flying system (accepts Aeroquip 32326 and
32343 fittings)
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FREQUENCY IN HERTZ
FIGURE 2 - DMC-1152B/DML-1152A
Axial Frequency Response
(1 watt/1 meter into LF midband)
page 3

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FIGURE 4 - DMC-1152B/DML-1152A FIGURE 5 - DMC-1152B/DML-1152A
Beamwidth vs. Frequency Whole Space Directivity Factor and Directivity Index
(anechoic) vs. Frequency Whole Space (anechoic)
(Shaped to reflect typical
music frequency spectrum)
LEVEL IN dB
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FIGURE 6 - DMC-1152B/DML-1152A
Harmonic Distortion
(120 dB SPL/1 meter using typical
music frequency spectrum)
DIRECTIVITY INDEX Di (dB)
page 6

THE DELTAMAX™ SYSTEM
Operation
PICTORIAL 1 — DMC-1152B Front Panel Diagram
OPERATION
FRONT PANEL INDICATORS AND CONTROLS
(refer to pictorial 1)
1. INPUT LEVEL INDICATORS: Three LEDs
show the drive level at the input of the control-
ler. Levels are calibrated in dBu (-20, 0, + 16)
NOTE: Do not allow the 16-dB input-level
indicator to stay on continuously. If the 16-dB
indicator is allowed to stay on for long periods,
the input circuit will clip. The input signal
should be reduced until the 16-dB indicator
lights only on loud instantaneous peaks.
GAIN REDUCTION INDICATORS: Three
LEDs show how much gain reduction is occur-
ring in the compressor at the input of the con-
troller. The display is calibrated in relative dB
(3, 6, 12). Gain reduction occurs only when the
maximum temperature, excursion and amplifier
capabilities are exceeded for either the woofer
or compression driver. The Output-Limits dis-
play indicates which limits are being exceeded
when gain reduction occurs.
NOTE: Do not allow the 12-dB-gain-reduction
indicator to stay on continuously. If the 12-dB
indicator is allowed to stay on for long periods,
the speaker may be damaged. The input
signal should be reduced until the 12-dB
indicator lights only on loud passages.
3. OUTPUT LIMIT INDICATORS:
A. TEMPERATURE LIMIT: These LED's
light when the temperatures of the woofer
or compression-driver voice coils
approach their maximum allowable limit.
Under this condition, gain reduction will
occur at the input of the controller so that
the maximum-temperature limits will not
be exceeded for either the woofer or
compression driver.
B. EXCURSION LIMIT: These LED's light
when the excursion of the woofer cone or
compression-driver diaphragm approach
their maximum allowable limit. Under this
condition, voltage clamping will occur at
the output of either the low- or high-
frequency section so that the maximum-
excursion limits will not be exceeded for
either the woofer or compression driver.
C. AMPLIFIER LIMIT: These LED's will
provide status information for the high-
and low-frequency power amplifiers if the
controller has been calibrated to the
amplifiers. (See the AMPLIFIER/
CONTROLLER CALIBRATION section.)
With the Cal/Clip-Limit switch pressed in,
the LED's will signal the occurence of
amplifier clipping. With the switch in the
outward position, the LED's indicate that
gain reduction in the form of hard limiting
is occurring at the input of the controller to
prevent the amplifiers from clipping.
OUTPUT LEVEL CONTROLS:
A. LF: This control adjusts the level of the
low-frequency output signal. The control
range is from -12 dB to +12 dB.
NOTE: The gain has been structured within
the DMC-1152B controller so that DML-1152A
loudspeaker will have a flat frequency re-
sponse (as shown in Figure 3) in an anechoic
environment with the output levels of the
controllers set in the 0-dB-detent position and
with the amplifier channels having identical
gain driving the LF and HF sections of the
speakers.
page 8

THE DELTAMAX™ SYSTEM Operation
OPERATION (continued)
5. AMPLIFIER CALIBRATION CONTROLS:
These controls are used for calibrating the con-
troller to both the low- and high-frequency am-
plifiers so that the controller can monitor the
clipping of the amplifier outputs and, if desired,
act as a limiter to prevent amplifier clipping.
See AMPLIFIER/CONTROLLER CALIBRA-
TION section.
NOTE: The calibrated markings on the front
panel correspond to the power level that an
amplifier would deliver to an 8-ohm load. A
crude, approximate calibration can be ob-
tained by rotating the control until the slot of
the trimpot points at a power level equivalent
to the amplifier power rating for an 8-ohm
load. (When the trimpot is in its mid position it
is pointing at 400 watts.)
6. CAL-CLIP LIMIT SWITCH: This switch selects
the mode that controller will monitor the amplifi-
ers (assuming that the controller has been cali-
brated to the amplifiers - see AMPLIFIER/
CONTROLLER CALIBRATION section). With
the switch pushed in, the Amplifier Limit LED's
will indicate when the amplifiers are clipping.
With the switch in the outward position, the Am-
plifier Limit LED's will indicate that gain reduc-
tion is occurring to prevent the amplifiers from
clipping.
NOTE: If the controller has not been cali-
brated to both the low- and high-frequency
amplifiers, the Cal/Clip Limit switch should be
pushed in. This will defeat the compressor/
limiter from trying to prevent amplifier clipping.
(The Amplifier Limit LED's will still flash when
the amplifier exceeds the power levels that the
Amplifier Calibration trimpots are set to.) Poor
sound quality can result with incorrect calibra-
tion and the compressor/limiter engaged.
7. POWERINDICATOR: This LED lights when
the controller is on.
8. POWER SWITCH: This switch turns the con-
troller on and off.
BACK PANEL CONNECTIONS (refer to Pictorial 2)
1. AC POWER CORD RECEPTACLE: This re-
ceptacle is for the ac power cord (supplied with
the unit).
2. FUSE RECEPTACLE: This fuse receptacle
requires either a 0.25 A 250 V slow blow fuse
(for 100/120 V ac operation), or a 0.1 A 250 V
slow blow fuse (for 220/240 V ac operation).
3. SENSE INPUTS:
A. LF: This input is for the connection of the
sense line to monitor the power delivered
to the woofer and should be connected to
the output of the low-frequency amplifier.
B. HF: This input is for the connection of the
sense line to monitor the power delivered
to the compression driver and should be
connected to the output of the high-
frequency amplifier.
NOTE: The Sense Inputs are floating differen-
tial with 5-way binding posts, see CONNEC-
TOR and CABLE REQUIREMENTS section
for detailed wiring information.
4. OUTPUTS:
A. LF: This input is the low-frequency output
of the DMC crossover/controller and
should be connected to the input of the
low-frequency amplifier.
B. HF: This connection is the high-frequency
output of the DMC crossover/controller
and should be connected to the input of
the high-frequency amplifier.
PICTORIAL 2 — DMC-1152B Back Panel Diagram

THE
DELTAMAX™
SYSTEM
Operation
OPERATION (continued)
5. GAIN CONTROL BUS: This '/4-inch jack is for
slaving the gain-control busses of other DMC
controllers to enable gain tracking in a multiple-
controller system. See CONNECTOR and
CABLE REQUIREMENTS section for detailed
wiring information.
6. INPUT: This connection is for the full-range
signal input to the DMC controller. This input is
electronically balanced with a female 3-pin
XLR-type connector with pin 1 as a ground ref-
erence, ріп 2 high (+) and pin З low (-). See
CONNECTOR and CABLE REQUIREMENTS
section for detailed wiring information.
TYPICAL SYSTEM OPERATION
The
DML-1152A
is
a
full-range
biamped
loudspeak-
er
system
to
be
used
with
the
DMC-1152B
elec-
tronic
controller.
The
DML-1152MC
is
a
slant-monitor
version
of
the
DML-1152A
and
is
also
used
with
the
DMC-1152B
controller.
Besides
con-
ventional
frequency
division,
the
DMC
electronic
controllers
have
equalization
and
time
delay
to
ob-
tain
optimum
performance
from
their
respective
DeltaMax™
DML
loudspeaker
systems.
In
addition,
sense
lines
to
the
controllers
monitor
the
voltage
drive
to
each
loudspeaker
in the
system
and
auto-
matically
activate
protection
circuitry
to
prevent
cone/diaphragm
overexcursion,
voice-coil
overheat-
ing
and
amplifier
clipping.
Before
operating
a
DeltaMax™
system,
the
user
should
read
this
man-
ual
thoroughly
and
make
sure
that
the
system
has
been
set
up
as
detailed
in
the
INSTALLATION
sec-
tion
and
the
amplifiers
and
controller
have
been
calibrated
as
detailed
in
the
AMPLIFIER/CON-
TROLLER
CALIBRATION
section.
The
gain
and
equalization
structures
in
the
DMC
controllers
have
been
set
up
so
that
the
DML
loud-
speaker
systems
will
have
a
flat
frequency
re-
sponse
(in
an
anechoic
environment)
when
the
Output
Level
trimpots
on
the
controllers
are
set
in
the
0-dB
detent
position
and
the
amplifiers
all
have
the
вате
gain
(i.e.,
the
amplifiers
are
calibrated
for
32
dB
of
gain
as
detailed
in
the
AMPLIFIER/CON-
TROLLER
CALIBRATION
section).
This
gives
the
user
a
standard
reference
every
time
the
system
is
setup.
Adjustments
to
the
drive
levels
of
the
low-
and
high-frequency
sections
are
then
only
needed
to
compensate
for
room
acoustics
or
array
configu-
rations.
When
adjustments
are
required,
they
should
be
made
with
the
Output
Level
trimpots
on
the
controllers.
The
level
controls
on
the
amplifiers
should
be
left
in
their
calibrated
positions.
(See
the
MULTIPLE
LOUDSPEAKER
ARRAY
section
for
circumstances
when
it
is
permissible
to
adjust
the
amplifier
level
controls.)
The
input
circuit
of
the
DMC
controllers
clips
with
a
*18
dBu
(6.2
volts
rms)
input
signal.
The
input-
signal
level
display
has
three
LED's
calibrated
to
-20,
0
and
+16
dBu.
To
avoid
clipping,
the
input
should
be
driven
only
to
the
point
that
the
+16
dB
LED
lights
on
instantaneous
peaks.
If
more
gain
is
desired
from
the
controller,
the
Output
Level
trimpots
may
be
turned
up.
Note
that
there
are
cali-
brated
markings
on
the
front
panel
of
the
controller
(3
dB
per
division)
to
enable
accurate
gain
adjust-
ments.
Extensive
modeling
circuits
allow
the
controller
to
monitor
the
status
of
the
voice-coil
temperature
and
the
cone/diaphragm
excursion
of
the
loudspeakers
in
each
frequency
band.
If
a
loudspeaker
in
one
of
the
frequency
bands
approaches
its
maximum
ther-
mal
limit,
a
multi-time-constant
compressor
circuit
with
a
variable
compression
ratio
will
reduce
the
peak
and
average
levels
of
the
full-range
input
sig-
nal
as
necessary
to
protect
the
driver,
while
pre-
serving
the
spectral
balance
and
the
relative
program
dynamics.
When
gain
reduction
occurs,
an
Output
Limit
Temperature
LED
will
light
indicat-
ing
which
frequency-band
loudspeaker
is
reaching
its
thermal
limit.
If
a
loudspeaker
in
one
of
the
fre-
quency
bands
approaches
its
maximum
excursion
limit,
a
dynamic
frequency-sensitive
voltage-clamp-
ing
circuit
at
the
output
of
that
frequency
band
will
clamp
the
peak
of
the
output
waveform
at
a
level
above
which
excursion
damage
would
occur
to
the
loudspeaker;
hence,
preserving
the
overall
spectral
balance.
When
voltage
clamping
occurs,
an
Output
Limit
Excursion
LED
will
light
indicating
which
fre-
quency-band
loudspeaker
is
reaching
its
excursion
limit.
The
DMC
Controller
will
also
prevent
long-term
amplifier
clipping.
The
controller
must
be
calibrated
as
detailed
in
the
AMPLIFIER/CONTROLLER
CALIBRATION
section
and
the
Cal/Clip
Limit
switch
must
be
in
the
Out
position
for
this
function
to
work
properly.
If
an
amplifier
in
one
of
the
fre-
quency
bands
approaches
clipping,
a
multi-time-
constant
compressor-limiter
circuit
will
reduce
the
peak
and
average
levels
of
the
full-range
input
sig-
nal
as
necessary
to
prevent
long-term
clipping
while
preserving
the
overall
spectral
balance.
When
gain
reduction
occurs,
an
Output
Limit
Ampli-
fier
LED
will
light
indicating
which
frequency-band
amplifier
is
reaching
its
power
limit,
With
the
Cal/
Clip
Limit
switch
pushed
in,
gain
reduction
will
not
occur
to
prevent
amplifier
clipping
and
the
Output
Limit
Amplifier
LED's
will
simply
indicate
when
the
amplifiers
are
going
into
clipping.
The
DeltaMax™
DMC
controllers
provide
protection
for
the
loudspeakers
without
affecting
the
overall
spectral
balance
or
dynamic
range.
The
controllers
have
an
LED
display
to
inform
the
user
when
the
protection
circuitry
is
activated
and
what
is
causing
the
protection
to
take
place.
Each
frequency
band
—
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—
page 10