Electro-Voice DeltaMax DML-1122 User manual

E Eleciro-Voice”
y THE DELTAMAX™ SYSTEM
OWNER'S MANUAL
DMC-1122/DMC-1152 CONTROLLERS
DML-1122/DML-1152 LOUDSPEAKERS

THE DELTAMAX" SYSTEM Table of Contents
TABLE OF CONTENTS
Page
DESCRIPTION and FEATURES. cinco vos SSE VAR ya RASS ances
SPECIFICATIONS
Оешма Gontroller (DME) „ао ез аз rmm ITA EVIS KAN kas raa 3
DONSMAKSVEIOMI v. 2; cue pu OKON es ES emia Pan Ee VON KOTAS 3
Dolta] Max: Eoudspeaker (ОМ!) т ¿uQ ess js es sos stere sev uua enas 4
DML-1122/DMC-1122 Frequency Response ...................... 5
DML-1152/DMC-1152 Frequency Response ...................... 5
DMI=1:422 Polar Ĥosponse „su e eso o VE д» antes EN ERR 5,6
DMI-1159 Poar Hesponee.- ее 7,8
DMI=1122/DMET52 Beamwldtft Se eru prr mnt SE pone 9
DME-1122 Directivity Factor, index... sere» er metn mn tme 9
ВМЕ: 152 Directivity ЕВО IBdOX:. ve eee reet ones sie e 9
DML-1122/1152: Harmonie Distortion „se em es meme mre nns 9
FUNCTIONAL BEOCK DIAGRAM ........ 25, ere ko minion nie KIS SS 10
OPERATION
ООО als su ura paras OF о оиа s Kn a e a daa earns 11
Eimit Indicalionig: 2.5: sai sen SONS Sin ace Chee Garam 11
Amplifier Emil zs de vis tr rA IN E OA TKP 11
Exeuralon ШИЕ sus seson: Us (SLE UN kN Beet SA ASSI 11
Temperature: iikuy. occ v PERI e pE EE THING ER 12
INSTALLATION
Amplifier Bedquiremieris urs nt ay apasaq cu pe e nca da eg 12
Connector and Cable ВЋедиігетепќѕ ........................... 12
DeltaMax Speaker Installation ................................ 12
Interconnections for Single Channel Operation .................. 13
DeltáMax Output Connections . . |: ==» xis se ase u. oe Heim laos aw ens 13
Interconnections for Two-Channel Operation .................... 14
DeltaMax Controller Installation. -rsss e» ste mision йн samo niao tee 15
Operating Voltage Selecta .« «uu sm хо ашыкка» ne unge aes 15
МОЧИТЬ: оао аве scm; еее a tine ия атанан еласа T ци ek tu carer 16
Mic op TET ON T CET CTI 16
MONIIAŬON ¿sassa sue =tajs wr excel аган алате а ашу c III SN 16
MAUNTENANGE! еее ыы ko eo okej nepero l sado я 16
X-RAY VIEW OF P.C. BOARDS
Power Supply Ваа: ies ESEO ON EX ENS He ISS 17
Man IBOBIO Ch peso scie ouest NNI КУ EIN SX vB do ee 18
SCHEMATIC DIAGRAMS: = 1524 Im ems ats iae 19-28
SERVICE/WARRANTY INFORMATION
Shipping Damage sss sisi saa 858 alo klako alo ave Skemo элем gie йабан 29
KMIOKIISGNVIOB c оу ero lL krm RE shoud Matias ета 29
Gontroller Power Inspection. sesa us кйш eis 4 su SIU» lanan 29
Driver Replacement): ео lon Y We tis Saa uo Siete НМ 29
а E OE a а ме 29
WARNING: “TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.”
“DeltaMax Loudspeaker (DML)
DeltaMax Controller (DMC)
The DML and DMC abbreviations are used quite frequently in the manual.

THE DELTAMAX" SYSTEM
Description
DESCRIPTION
GENERAL
The DeltaMax™ System consists of a 2-way biamped, high
performance speaker system and a companion electronic
controller. The DML-1122 and DML-1152 are full-range
loudspeaker systems, intended for high-level sound reinforce-
ment in touring sound and permanent installation applications.
The electronic-protection technology incorporated into the
DeltaMax™ System allows the loudspeakers to be operated at
full capacity with maximum fidelity and reliability. The trapezoidal
cabinet shape allows tight cluster designs, enabling maximum
mutual coupling and single-point-source arrays.
The DML-1152 employs a 15-inch woofer for low-frequency
reproduction, and a standard 2-inch exit DH1A compression
driver, The DML-1122 utilizes a 12-inch woofer and a 1.3-inch
exit modified DH1A high-frequency driver. Both systems use
flat-front, constant-directivity, high-frequency horns 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 versions, models DML-1122F and
DML-1152F, include three steel-reinforced aircraft-type pan
fittings on the top and bottom of the enclosures to facilitate the
hanging of multi-cabinet arrays. The DML-1122F/DML-1152F
Flying Manual is packed with each flying speaker system.
The electronic circuits are designed to provide optimum audio
performance, even when the audio drive level is increased for
maximum loudness. A high-performance compressor is con-
trolled by special speaker modeling circuits to provide speaker
excursion protection, speaker temperature protection, and
amplifier anti-clip limiting.
Optimum performance of these speakers can only be assured
when used with their dedicated electronics. Do not use with
other electronic crossovers and/or processors.
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 each driver control the compressor to
prevent voice coil overheating and amplifier clipping.
Voltage-clamp excursion protection does not alter program
dynamios.
Multi-time-constant compressor circuit with variable compres-
sion ratio reduces peak and average levels as necessary
while preserving relative program dynamics.
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 com-
pressor gain reduction. Sensing display for each sense
channel shows amplifier limit, excursion limit, and
temperature limit. When its limit is approached, each LED
lights yellow. i
Speaker system is trapezoidal for compact arrays. Flying
versions
feature
integral,
steel-reinforced
fittings
to
facilitate
hanging.
Both
the
woofer
and
the
compression
driver
employ
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
response.
ل
ایی

THE DELTAMAX™ SYSTEM Specifications
CONTROLLER SPECIFICATIONS
CHANNEL CONFIGURATIONS —
Monaural two-way; two sense channels
FILTER TYPE —
4th-order Linkwitz-Riley
CROSSOVER FREQUENCY —
1250 Hz
GAIN —
6 dB nominal, equalized outputs
TOTAL HARMONIC DISTORTION, 20-20,000 Hz —
0.03% typical, 0.1% maximum
NOISE, EACH OUTPUT, 20-20,000 Hz NBW, TYPICAL —
— 86 аВи
SIGNAL INPUT —
Maximum Level:
+18 dBu
Impedance:
20,000 ohms
CMRR, Typical:
-55 dB
Connector:
Female 3-pin XLR-type
SYSTEM SPECIFICATIONS
Frequency Response, Measured In Farfield Calculated to One
Meter on Axis, Swept One-Third-Octave Pink Noise, 2.83 V at
500 Hz, Anecholc Environment, +3 dB:
Sound Pressure Level at One Meter, One Watt Input Power,
Anechoic Environment, Band-Limited Pink-Noise Signal,
400-1,200 Hz:
Typical Maximum Continuous Sound Pressure Levels at One
Meter, Anechoic Environment:
Typical Maximum Peak Sound Pressure Levels at One Meter,
Апеспо!с Environment:
Crossover Frequency:
Dispersion Angle Included by 6-dB-Down Points on Polar
Responses, Indicated One-Third-Octave Bands of Pink Noise:
Directivity Factor R, (Q):
Directivity Index Dj:
Distortion, Indicated SPL at 1 Meter, Shaped Spectrum Second
Harmonic,
100 Hz:
800 Hz:
2,000 Hz:
5,000 Hz:
Distortion, Indicated SPL at 1 Meter, Shaped Spectrum Third
Harmonic,
100 Hz:
800 Hz:
2,000 Hz:
5,006 Hz:
SENSE CHANNEL INPUTS —
Maximum Level,
LF: 145 V RMS
HF: 145 V RMS
Impedance:
100 kilohms each side to ground
Connector:
Two 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” rack mount, 1.75" high, 8.25” behind panel
(exciuding connectors)
Supplied with front-pane! security cover for controls.
DML-1122/DMC-1122
70 Hz-20 kHz
(see Figure 1)
98 dB
123 dB
129 dB
1,250 Hz
1.0-20 kHz horizontal
(see Figure 5)
809 (--259, —20°)
3.8-20 kHz vertical
(see Figure 5)
559 (1259, —59)
1.0-20 kHz median
(see Figure 7)
10.6 (+9.3, —4.0)
1.0-20 kHz median
(see Figure 7)
(+3.2 dB, -1.6 dB)
115 dB SPL (see Figure 9)
4.5%
0.8%
0.7%
1.6%
115 dB SPL (see Figure 9)
0.9%
1.8%
0.9%
1.6%
` DML-1152/DMC-1152
50 Hz-20 kHz
(see Figure 2)
100 dB
126 dB
132 dB
1,250 Hz
1.2-20 kHz horizontal
(see Figure 6)
60° (+25°, —5°)
1.2-20 kHz vertical
(see Figure 6)
40° (+25°, —5°)
1.0-20 kHz median
(see Figure 8)
19.3 (+12.8, -7.3)
1.0-20 kHz median
(see Figure 8)
(+3.0 dB, -1.3 dB)
120 dB SPL (see Figure 10)
4.3%
1.0%
0.7%
1.5%
120 dB SPL (see Figure 10)
0.7%
1.4%
0.7%

THE DELTAMAX" SYSTEM
SPEAKER SPECIFICATIONS
Transducer Complement, High Frequency:
Low Frequency:
Efficiency,
High Frequency:
Low Frequency:
Long-Term Average Power Handling Capacity Per EIA Standard
RS-426A,
High Frequency:
Low Frequency:
Short-Term Power Handling Capacity (10 ms.),
High Frequency:
Low Frequency:
Maximum Long-Term Midband Acoustic Output,
High Frequency:
Low Frequency:
Nominal Impedance,
High Frequency:
Low Frequency:
Minimum Impedance,
High Frequency:
Low Frequency:
Dimensions,
Height:
Width:
Depth:
Net Weight:
Shipping Weight:
Enclosure Materials,
Structural:
Finish:
Grille:
Hanging (DML-1122F and DML-1152F only):
faur
DML-1122
DH1A variant compression
driver (1.3-inch exit)
DL12X variant
12-inch woofer
25%
4.5%
75 watts
300 watts
300 watts
1,200 watts
18.8 watts
13.5 watts
8 ohms
8 ohms
6.0 ohms
8.4 ohms
58.4 cm (23.0 in.)
37.1 ст (14.63 in.)
35.6 om (14.0 in.)
30.7 kg (68 Ib)
33.9 kg (75 Ib)
14-ply birch plywood
Black textured paint
Steel with charcoal gray foam
3-point flying system
(accepts Aeroquip 32326
and 32343 fittings)
Specifications
DML-1152
DH1A compression driver
(2-inch exit)
DL15X 15-inch
woofer
25%
5.0%
75 watts
400 watts
300 watts
1,600 watts
18.8 watts
20.0 watts
8 ohms
8 ohms
6.5 ohms
7.9 ohms
75.9 cm (29.88 in.)
45.2 cm (17.78 in)
41.4 cm (16.28 in)
43.3 kg (96 Ib)
47.4 kg (105 16)
14-ply birch plywood
Black textured paint
Steel with charcoal gray foam
3-point flying system
(accepts Aeroquip 32326
and 32343 fittings)

THE DELTAMAX™ SYSTEM Figures
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FIGURE 1—DML-1122/DMC-1122 Axial Frequency FIGURE 2—DML-1152/DMC-1152 Axial Frequency
Response (1 watt/1 meter into LF midband) Response (1 watt/1 meter into LF midband)
FIGURE 3 — DML-1122/DMC-1122 Polar Response HORIZONTAL
(%-octave pink noise, 4 volts at 20 feet) VERTICAL ————
five

Figures
THE DELTAMAX™ SYSTEM
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FIGURE 3 (continued) — DML-1122/DMC-1122 Polar Response HORIZONTAL
(Vs-octave pink noise, 4 volts at 20 feet)
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Figures
THE DELTAMAX™ SYSTEM
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VERTICAL ———
FIGURE 4 — DML-1152/DMC-1152 Polar Response
(Vs-octave pink noise, 4 volts at 20 feet)

Figures
[EV] THE DELTAMAX" SYSTEM
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(V3-octave pink noise, 4 volts at 20 feet)
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[Ev] THE DELTAMAX™ SYSTEM
BEAMWIDTH IN DEGREES
(-6 dB)
DIRECTIVITY FACTOR Rg (Q)
FIGURE 7 — DML-1122/DMC-1122 Directivity
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FREQUENCY (Hz)
FIGURE 5 — DML-1122/DMC-1122
Beamwidth vs. Frequency
Whole Space (anechoic)
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LEVEL IN dB
Whole Space (anechoic)
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FIGURE 9 — DML-1122/DMC-1122
Harmonic Distortion (115 dB SPL/1 meter
using typical music frequency spectrum)
DIRECTIVITY INDEX Di (dB)
Figures
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FREQUENCY (Hz)
BEAMWIDTH IN DEGREES
FIGURE 6 — DML-1152/DMC-1152
Beamwidth vs. Frequency
Whole Space (anechoic)
£ MO
-—
SPECIFIC
Ra
VALUES
Ht-
DIRECTIVITY FACTOR Ra (Q)
DIRECTIVITY INDEX Di (dB)
FREQUENCY IN HERTZ
FIGURE 8 — DML-1152/DMC-1152 Directivity
Factor and Directivity Index vs. Frequency
Whole Space (anechoic)
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FREQUENCY IN HERTZ
FIGURE 10 — DML-1152/DMC-1152
Harmonic Distortion (120 dB SPL/1 meter
using typical music frequency spectrum)
LEVEL IN dB

Block Diagram
THE DELTAMAX™ SYSTEM
FUNCTIONAL BLOCK DIAGRAM
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[EV] tHe DELTAMAX™ SYSTEM
Operation
OPERATION
CALIBRATION
To prevent amplifier clipping it is necessary to calibrate the
DeltaMax™ Controller's internal amplifier limit circuits to the
actual clip level of the power amplifiers.
Before connecting ac power to the unit make sure that the unit
is compatible with the available mains voltage.
Make Connections
Connect the high- and low-frequency outputs of the
DeltaMax™ controller to the designated high- and low-
frequency inputs of the power amplifier. See the "Installation''
section for details. The maximum power recommendation for
the DMC-1122 is 600 watts per channel, and for the DMC-1152
itis 800 watts per channel. The suggested input cable configura-
tion is a balanced pair with a shield.
Connect the low-frequency output of the power amplifier to the
LF sense input of the DeltaMax™. Connect the high-frequency
output of the power amplifier to the HF sense input of the
DeltaMax™. High quality dual banana plugs are
recommended. Shielded or unshielded cable may be used. The
inputs are high-impedance, floating-differential. Small gauge
wire (i.e., 22 gauge) is acceptable, but be sure the connections
are secure and safe for the high voltages from the amplifier
output. See Figure 13 for a wiring diagram of a single
DeltaMax™ Controller to a dual-channel power amplifier.
BE SURE THE SPEAKERS ARE NOT CONNECTED TO THE
AMPLIFIERS AT THIS TIME
Front Panel Settings:
1. Set the two output level controls to their center-detent
position. The slots of the controls are aligned with the
"o" mark when in the center-detent position.
2. Turn the amplifier calibration control to full-counter-
clockwise.
3. Press the cal switch to its recessed position with a screw-
driver or other suitable tool.
4. Set both amplifier gain controls for 32 dB gain or full-
clockwise.
5. Connect an input signal with a 500-Hz test tone. Music
program may be used if ‘necessary.
6. Turn the LF output level control clockwise with a screw-
driver until the low-frequency channel of the power
amplifier begins to clip. Clipping is noted by the clip
indicator on the power amp or monitored with an
oscilloscope.
7. Turn the LF amplifier calibration control clockwise with
a screwdriver until the LF amplifier limit light of the
DeltaMax™ just comes on or to a lower, predetermined
power level. A lower power level setting is desirable when
the power rating of the amplifier is much greater than 250
watts. It should light at or just before amplifier clipping.
8. If using a test tone, adjust the oscillator for a test signal
of 5 kHz.
9. Turn the HF output level control clockwise with a screw-
driver until the high-frequency channel of the power
amplifier begins to clip.
10. Turn the HF amplifier calibration control clockwise with
a screwdriver until the HF amplifier limit light of the
DeltaMax™ just comes on. Again, the amplifier limit
indicator should light at or just before amplifier clipping.
11. Return the LF and HF output level controls to their
center detent position, and reset the cal switch to the
"Limit" position (out).
NOTE: Ifthe power amplifier has an internal limiter, or if clip
protection is not desired, the user has the option
to leave the "Limit" switch in the recessed
"Cal/Clip" position. When left in the Cal/Clip posi-
tion the “Amplifier Output Limit" lights on the front
panel of the DeltaMax™ will indicate when the
amplifier is self-limiting or clipping.
After the calibration sequence has been completed, connect
the speaker cables to the output of the amplifier. Make certain
that the "lows" are wired to the woofer and that the "highs"
are wired to the compression driver. In addition, be sure to
observe polarity when making speaker connections.
DISPLAY CIRCUITS
The display circuits indicate to the user what is actually
happening in the DeltaMax™ Controller and the DeltaMax™
Loudspeaker:
Input Level
These three indicators show the drive level at the input of the
DeltaMax™ Controller. They are calibrated in dBu (—20, 0,
and +16).
Gain Reduction
These three indicators show how much attenuation is being
imposed on the signal by the compressor. They are calibrated
in relative dB (3, 6, and 12), and provide a good indication of
how much compression is occurring.
NOTE: Do not allow the 12-dB indicator to stay on continuously.
If this happens, then reduce the input signal drive level.
Output Limits (for each output):
Amplifier Limit
With the switch in ‘‘Cal/Clip” position, the Amplifier Calibration
control should be adjusted so that this indicator lights when the
amplifier clips. It then acts as an amplifier clip indicator. With
the switch in the "Limit" position the indicator shows the onset
of DeltaMax™ limiting due to maximum amplifier power.
If this indicator lights frequently when properly calibrated, then
it may be desirable to use a larger power amplifier, or turn down
the system level. See the section on Amplifier Requirements.
Excursion Limit
This indicator lights when output voltage clamping is occurring
due to the detection of high diaphragm excursion. Excessive
diaphragm excursion may occur in the lower frequency ranges
of operation of the drivers during high level operation. Selective

THE DELTAMAX™ SYSTEM
Operation/Installation
OPERATION (continued)
equalization may be used to reduce the level of the frequency
range that is causing the excessive excursion, allowing higher
overall levels to be achieved. For example, program material
with heavy low frequency content played at high levels may
activate the woofer protection circuitry, limiting the overall sound
pressure level attainable. Reducing the levels of the frequency
bands below 100 Hz with an equalizer might eliminate the
excursion problems, allowing the overall level to be turned up
higher.
Temperature Limit
This indicator lights when the temperature of the speaker voice
coil approaches its maximum level. Under this condition, gain
reduction will occur so that the maximum temperature will not
be exceeded.
INSTALLATION
AMPLIFIER REQUIREMENTS
The DML-1122 and DML-1152 speaker systems require
professional power amplifiers with the following ratings:
DML-1122
LF: 300-600 watts continuous into eight onms
HF: 125-250 watts continuous into eight ohms
DML-1152
LF: 400-800 watts continuous into eight ohms
HF: 125-250 watts continuous into eight ohms
The power amplifiers should have a voltage gain between 27
and 35 dB (32 dB is optimum). The use of amplifiers with lower
power ratings is acceptable; however, the full-power capabilities
of the DML speakers will not be realized. The use of amplifiers
with significantly higher power ratings is wasteful and may
endanger the loudspeakers; it is generally not recommended.
Under certain circumstances higher rated power amplifiers are
acceptable. It is acceptable to drive either the DML-1122 or
DML-1152 speakers with a stereo power amp utilizing one chan-
nel to drive the low frequencies and the other channel to drive
the high frequencies. In this configuration the user should set
the “Amplifier Calibration” level to the 125-250-watt range to
limit excessively high power levels from reaching the compres-
sion driver. The user is instructed to consult the "Operation"
section of this manual for details of this procedure.
CONNECTOR AND CABLE REQUIREMENTS
Controller
The DeltaMax™ has XLR-type connectors for signal input and
output. Pin 1 is ground reference, pin 2 is high (+), and pin
3 is low (—). The LF and HF sense connections are five-way
binding posts. Figure 14 illustrates the preferred interconnect-
ing between the DMC and the power amplifier. Two typical
system configurations are illustrated in Figures 13 and 15.
The gain control bus is accessed through a two-conductor
¥%-inch jack. This feature is used when it is desired for the gain
of two or more units to track. Using a standard %-inch patch
cable, connect the jacks together. For more than two units, use
Y-connectors.
Speaker
The DML-1122 and DML-1152 are equipped with ITT-Cannon
EP-4 connectors for electrical connection to the woofer and
compression driver. Each cabinet has two connectors: one male
(EP-4-14) for input signal and one female (EP-4-13) for paralle!
wiring for connecting additional DML loudspeakers. The mating
connectors for the cable ends are the EP-4-11-IC for the input
connection and the EP-4-12-IC for the parallel connection.
Cables, connectors and wiring accessories for the DML
speakers are manufactured by Pro Co Sound, Inc., and
Whirlwind Music Distributors, Inc. To find your local Pro Co or
Whirlwind'dealer, contact:
Pro Co Sound, Inc.
135 E. Kalamazoo Ave.
Kalamazoo, MI 49007
Whirlwind Music Distributors, Inc.
P.O. Box 1075
Rochester, NY 14603
The pin connections are as follows:
Pin 1 = LF (-)
Pin 2 = LF (+)
Pin 3 = HF (-)
Pin 4 = HF (+)
Both the low-frequency and high-frequency inputs present a
nominal eight-ohm load to the amplifer; however, the
compression driver has a low-frequency protection capacitor
in series.
NOTE: DML-1122 speakers may be paralleled with other
DML-1122 speakers if the amplifier is capable of
delivering adequate power at the lower impedance.
The same holds true for the DML-1152 speaker
systems.
SPEAKER INSTALLATION
Hanging
The DML-1122F and DML-1152F are flying versions of the
DML-1122 and DML-1152.
*** CAUTION ***
The DML-1122F and DML-1152F speaker systems should
be suspended overhead only in accordance with the
procedures and limitations specified in the
DML-1122F/DML-1152F Flying Manual which is packed
with each flying speaker system.
Each cabinet has a total of six steel-reinforced aircraft-type pan
fittings (three on the top and three on the bottom). This three-
point flying system makes maximum use of the trapezoidal
cabinets, permitting a wide range of angle adjustment and
offering maximum flexibility in array design and implementa-
tion for both the touring sound company and the sound con-
tractor. The pan fittings mate with the Aeroquip 32343 and
32326 stud fittings.
suala

THE DELTAMAX™ SYSTEM Figure
SENSE INPUTS
HF
DMC-1122
le:
DMC-1152
INPUT CABLE
INPUTS
QO oo AMPLIFIER
HI LO
CHANNEL CHANNEL CHANNEL CHANNEL
TO DML
COMPRESSION
DRIVER
TO DML WOOFER
FIGURE 13 — interconnections for Single Channel Operation
DELTAMAX CONTROLLER
OUTPUT
(ONE CHANNEL SHOWN)
FIGURE 14 — DeltaMax'” Output Connection
att...

THE DELTAMAX™ SYSTEM
SENSE INPUTS
HF LF
Figure
GAIN
CONTROL
BUS
OUTPUT
HF LF
LF INPUT
n
PATCH
di l
SENSE [|
OUTPUT
HF
OO OO POWER
AMPLIFIER
LEFT RIGHT
LEFT DML
COMPRESSION
DRIVER
RIGHT DML) n
COMPRESSION
DRIVER i |]
L
lu
OUTPUT
LF
оо
о
POWER
Ө AMPLIFIER
LEFT — RIGHT
LEFT DML
WOOFER
RIGHT DML
|] U Û
WOOFER
mM Ш
CABLE
LI INPUT
LEFT RIGHT
HF HF
INPUT — INPUT
FIGURE 15 — Interconnection for Two-Channel Operation
fourteen

THE DELTAMAX™ SYSTEM
| Installation
INSTALLATION (continued)
DELTAMAX™ CONTROLLER INSTALLATION
Operating Voltage Selection
The DMC can be powered with line voltages other than 120
volts by altering the primary wiring of the power transformer.
*** CAUTION ***
No user serviceable parts inside. Hazardous voltage and
currents may be encountered within the chassis. To avoid
electric shock, do not perform any servicing unless you
are qualified to do so. Р
The service information contained within this document
is for use only by Electro-Voice, Inc., authorized warranty
stations and qualified service personnel.
To change the transformer primary wiring configuration use the
following procedure:
1. Disconnect the DMC from the ac power source.
2. Remove the seven screws securing the top cover. There
are two screws on each side, two screws on the rear and
one screw in the front panel (center, top).
3. Locate the voltage-selection terminal strip mounted on the
bottom of the chassis near the power transformer. The
transformer has six primary leads, five of which are
soldered to the terminal strip in the following order:
Position # Wire Color
1 Black
2 Violet
3 Blue
4 Violet/Blue
5 Blue/White
The sixth lead, which is black/white, and two black leads
from the fuse holder, are attached to the terminal strip with
solderless connectors. Primary operating voltage selection
is accomplished by moving these three wires to the
appropriate location. See Table | for the correct wire loca-
tion for the selected mains voltage.
100 V ac
TABLE |
Primary Power Conversion Chart for 100-, 120-, 220-, and 240-V, 50/60-Hz Operation
120 V ac
4. Install the correct line fuse. See values in Table Il.
5. Plug the DMC into a variac and sweep the mains voltage
from zero to full operating voltage while monitoring the
voltage on the primary filter capacitors. The measured
voltage should be +29 volts. See the PCB x-ray view п
Figure 17. If the measured voltage is not within 10% of this
value turn the unit off and verify the connections in step #3.
6. Reinstall the top cover with the seven screws.
Line Fuse,
MDL Series
Slo-Blo
0.25 A/250 V
0.25 A/250 V
0.10 A/250 V
Line Voltage
0.10 A/250 V
TABLE li
Main Fuse Selection Guide
240 V ac

[Ev] rue DELTAMAX" SYSTEM Installation/Maintenance
INSTALLATION (continued) MAINTENANCE
Mounting Use a soft damp cloth to clean the unit when it becomes dirty.
No other maintenance is required.
The unit is one rack-space high (134") and fits a standard EIA
19-inch rack. Mount the DMC in a rack cabinet near the power
amplifier(s) to make wiring easy.
Grounding
A widely accepted grounding technique for audio systems is
the single-point ground. The final configuration will be deter-
mined by the size of the system and the equipment used in
the system. However, the single-point grounding system is
recommended as a starting point.
The interconnecting cables of line level equipment, such as the
DeltaMax™ Controller should have the shields connected at
one point only, usually the receiving end of the signal transmis-
sion. See Figure 14.
Never lift the third wire safety ground of the ac power cable.
It protects against possible shock hazard.
When deciding how to best ground the DMC in a particular
system, note that the DMC's input and output XLR-type
connectors have pin 1 referenced to ground. Circuit ground
is tied to the chassis ground internally at one point. The input
to the DMC is active differential and the output is transformer
isolated.
Ventiliation
Adequate ventilation should be provided in the rack to main-
tain a reasonable operating temperature. Under any conditions
the ambient temperature inside the rack cabinet should not
exceed 60°C, or 140°F.
Security
A security cover and attachment screws are supplied to protect
the control settings against uninvited adjustments.
———O—ns— y P. ws nm. m. -—-..
_ sixteen