Electro-Voice 9003 Owner's manual

Electro-Voice 9003 Owner's manual
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OWNERS MANUAL
9003 MIXER/ AMPLIFIERS
OWNER'S MANUAL UNIVERSITY SOUND 9000-SERIES MIXER/AMPLIFIERS
TABLE OF CONTENTS
Page
INTRODUCTION
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BLOCK DIAGRAM
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OPERATION
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INSTALLATION
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Connecting to the Mainframe
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MAINTENANCE
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SERVICE and WARRANTY
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APPENDIX
Parts List, Exploded View, Schematic
WARNING: "TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE."
one
UNIVERSITY SOUND 9000-SERIES MIXER/AMPLIFIERS
FEATURES
Mainframe
(9003) 30—watt mixer/power amplifier with
six input ports.
(9006) 60-watt mixer/power amplifier with six
input ports.
(9012) 120-watt mixer/power amplifier with six
input ports.
A broad range of input modules Is available
from University; also will accept TOA 900-series
input modules (with some limitation on features
specific to University S000 products)
A direct output from the amplifier is provided
for speaker loads of 4 ohms or greater.
Transformer-isolated amplifier outputs are
provided for 25- or 70-volt constant-voltage
speaker systems or 8-ohm low-impedance
speakers.
Separate mixer/preamplifier and power
amplifier sections allow insertion of external
signal processing devices into the
mixer/amplifier signal chain.
True shelving-type tone controls with a defeat
switch and rear-panel adjustable EQ bypass
control,
Bridging input/output allows interconnection of
mix-busses of mixer/preamplifier sections of
multiple 9006/9012 units.
Two separate mute busses allow flexible con-
trol of the mute functions for the installed input
modules.
Remote-controllable VCA (voltage-controlled
amplifier) following the mixer/preamplifier sec-
tion allows remote volume control or limitation
ofthe maximum range ofthe front panel master
volume control.
Auto-reset thermal overload protection of the
power transformer.
Electronic protection circuitry and an output
fuse protects both the power amplifier and
speaker loads.
Two independent signal-processing busses for
mic- and line-level input modules.
Front panel rotary controls are supplied stand-
ard with shaft-locks.
e An illuminated meter indicates the power
OWNER'S MANUAL
amplifier output level.
e Units are rack-mountable with optional CAMB-
931 bracket kit.
DESCRIPTION
The University 9000-series mixer/power amplifiers
provide wide frequency response, low noise, low dis-
tortion and extremely flexible user-configurable fea-
tures. They are ideal for use in sound systems for
churches, schools, auditoriums, business/industrial
environments, backgound/foreground music sys-
tems and paging systems of any type.
As many as six optional modules may be installed in
the ports in the rear panel. Front panel controls are
used to adjust the signal level of each input and a
master volume control adjusts the overall output
level of the combined input signals. Bass and treble
tone controls allow tailoring of the frequency
response of the unit. A front panel pushbutton switch
allows defeating the tone controls (a rear panel ad-
justable EQ bypass control permits setting the max-
imum range of tone control).
Two mute busses give the user great flexibility in
determining which signals should be muted when
paging or other mute-related functions are used. The
mute busses are accessible via terminals located on
the rear panel; bus selection is accomplished by in-
stalling or removing internal jumpers in the 9000-
series modules.
OWNER'S MANUAL
A MASTER VOLUME control, combined with the
OUTPUT LEVEL meter, permits ease of adjustment
of the combined input signal levels to the power
amplifier for optimum output. -
The power amplifier includes thermal, dc-offset and
current-limiting short-circuit protection to help
prevent amplifier or speaker damage due to mis-
wired, open or shorted speaker lines or amplifier
overheating. The amplifier Is muted when switched
on to prevent speaker damage from "turn-on thump.”
UNIVERSITY SOUND 9000-SERIES MIXER/AMPLIFIERS
three
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UNIVERSITY SOUND 9000-SERIES MIXER/AMPLIFIERS
MAINFRAME
POWER OUTPUT -
9003:30 watts RMS
9006: 60 watts RMS
9012: 120 watts RMS
TOTAL HARMONIC DISTORTION AT
RATED OUTPUT, 1,000 Hz -
Less than 0.02%
FREQUENCY RESPONSE -
20 Hz - 20,000 Hz, +/- 1dB (direct)
20 Hz - 15,000 Hz, +/- 1dB (xfmr)
20 Hz - 20,000 Hz, + 1/-3dB (xfmr)
TONE CONTROLS -
Bass: +/- 10dB at 100 Hz (shelving)
Trebie: +/- 10 dB at 10,000 Hz (shelving)
SIGNAL-TO-NOISE RATIO,
(tone controls defeated, 20-20,000 HZ) -
Master (at Max): 77dB
Master (at Min): 90dB
Power amp only: 105dB
INPUT SENSITIVITY/IMPEDANCE -
Input Ports: 100mV/10,000 ohms
Bridging: 100mV/3300 ohms
Power Amp: 1V/10,000 ohms
OUTPUT LEVEL/IMPEDANCE -
Preamp: 1V/600 ohms
Aux: 1V/10,000 ohms
Transformer: 25V, 70V, 8 ohms
Direct: 4 ohms
OUTPUT REGULATION -
Transformer Output: 1.0dB, no load to fuil load
Direct Output: 0.5dB, no load to full load
PROTECTION -
Amplifier: Short-circuit current limited, Thermal
cut-out
Load: DC offset, Turn-on/turn-off transients
(delay), Output fuse
Transformer: Auto-reset thermal protection
Mainframe: AC line fuse
four
OWNER'S MANUAL
FRONT PANEL CONTROLS -
(all rotary controls are-lockable)
6 Input Level, Bass, Treble, EQ Defeat pushbut-
ton switch, Master Volume, Power On/Off push-
button switch
METER -
Output Level Meter
FRONT PANEL INDICATORS -
Output Level Meter is illuminated when power
is on
REAR PANEL CONTROLS -
Preamp Out/Power Amp In Link Switch, Lo-cut
switch, EQ Bypass (variable)
REAR PANEL CONNECTORS -
Input Ports 1 thru 6: card edge-connector (for
modules)
Preamp Out: RCA phono jack
Aux Out: RCA phono jack
Power Amp In: RCA phono jack
Bridging In/Qut: RCA phono jack
Mute: Screw terminals
Speakers: 7 screw terminals on barrier strip
(ground, 4 ohms, output transformer in, com-
mon, 8 ohms, 25V, 70V)
Remote Master Volume: Screw terminals
AC Power Cord/Plug: 2 conductor with
ground/3-prong grounded
AC Receptacle: 3-pin grounded
FUSES -
- 9003:0UTPUT FUSE -3AG 250V5A
LINE FUSE -3AG 250V 2A
9006: OUTPUT FUSE - 3AG 250V 5A
LINE FUSE - 3AG 250V 3A
9012: OUTPUT FUSE - 3AG 250V 10A
LINE FUSE - 3AG 250V 5A
POWER REQUIREMENTS -
9003:120 VAC, 60Hz, 50 watts
9006: 120 VAC, 60 Hz, 100 watts
9012: 120 VAC, 60 Hz, 180 watts
OWNER'S MANUAL
OPERATING RANGE -
-10°C to +60°C -
(12°F to 140°F)
DIMENSIONS -
Height: 13.2 cm (5.2 in.), without feet
14.5 cm (5.7 in.), with feet
Width: 42.0 cm (16.5 in.)
Depth: 31.5 cm (12.4 in.)
ENCLOSURE -
Black-painted steel chassis, black-anodized
brushed aluminum front panel, white graphics
WEIGHT -
9003: 7.8kg (17 Ibs)
9006: 11.8 kg (26 Ibs.)
9012: 15.4 kg (34 Ibs.)
OPTIONAL MODULES -
CRH-31X: Transformer-coupled Lo-Z mic
module with muting. XLR connector, gain con-
trol, tone controls. Internal jumpers select
phantom power, muting options.
CRH-31S: Transformer-coupled Lo-Z mic
module with muting. Screw terminal connec-
tions, gain control, tone controls, Internal
jumpers select phantom power, muting op-
tions.
CRL-12S: Transformer-coupled line input
module with muting. Screw terminal connec-
tions, gain control, tone controls. Internal
jumpers select muting options.
CRFM-01: FM tuner module with muting. 75
Ohm "F" connector for antenna, AFC switch,
tuning control. Internal jumpers select muting
options.
CRX-11R: Auxiliary (line-level) preamplifier with
muting. Internal jumpers select muting options.
CRT-01S: Transformer-coupled line output
module. Provides isolated, line-level output
from mixing bus. Screw terminal connections,
gain contral.
MEC-01: Module extension card. Allows ease
of access to all components and circuit board
of a standard 9000-series module.
UNIVERSITY SOUND 9000-SERIES MIXER/AMPLIFIERS
CRS-03S: Chime module. Module produces
either a "single-strike" or repeating chime tone.
Selection is via screw terminals on module.
Output level, pitch, oscillation controls.
five
6
UNIVERSITY SOUND 9000-SERIES MIXER/AMPLIFIERS OWNER'S MANUAL
MAINFRAME
e BLOCK DIAGRAM
MODULE 1
MUTE == | OPTIONAL
PLUGIN
MODULE 2 AUDIO PROCESSING
MUTE — 1
EQ BYPASS
A VOLTAGE
1 CONTROLLED POWER
MUTE — 7 AMP AMP
MIX EQ VCA
MUTE -——+ | | OPTIONAL AE ВНЕ
PLUG IN
MODULE 3 AUDIO PROCESSING
MODULE 3
7
МУТЕ — =
MODULE 6
MUTE == |
MUTE 1
MUTE ee sul
ERIDGING IN OUT
REMOTE VOLUME
six
OWNER'S MANUAL
UNIVERSITY SOUND 9000-SERIES MIXER/AMPLIFIERS
Pictorial 1.1 - Front Panel Diagram
OPERATION
FRONT PANEL CONTROLS (Refer to Front Panel
Diagram, Pictorial 1.1)
1. POWER ON/OFF: A two-position pushbutton
switch that applies ac mains to the unit.
2. INPUT 1-6: Potentiometers which adjust the out-
put signal level from the corresponding input
module.
3.QUTPUT LEVEL: This meter indicates the output
signal level of the power amplifier. The meter will
read "0" when a sine-wave input signal Is amplified to
the rated output power of the amplifier.
4. BASS: Provides boost or attenuation of the bass
(low) frequencies. Obtain normal or "flat" response
by setting the dot on the knob at "12 o'clock." Rotate
the control clockwise to increase bass output, or
counter-clockwise to decrease bass output. This is
a "shelving" tone control, which means all frequen-
cles below the nominal comer frequency (in this
case, 100 Hz) are raised or lowered equally as the
control Is adjusted.
5. TREBLE: Provides boost or attenuation of the
treble (high) frequencies. Obtain normal or "flat"
response by setting the dot on the knob at "12
o'clock." Rotate the control clockwise to increase
treble output, or counter-clockwise to decrease
treble output. This is also a shelving-type tone con-
trol.
6. TONE IN/OUT: A two-position pushbutton switch
that allows use of the bass and treble (EQ) controls
or to bypass them. With the switch in the "IN" posi-
tion, the bass and treble controls equalize the audio
signal. With the switch in the "OUT" position, the con-
trols are bypassed and no equalization is added to
the signal.
7. MASTER VOLUME: Adjusts the overall level of the
combined signals of the six input channels. Clock-
wise rotation of the control increases the signal level.
seven
UNIVERSITY SOUND 9000-SERIES MIXER/AMPLIFIERS
OWNER'S MANUAL
Pictorial 1.2 - Rear Panel Diagram
OPERATION
REAR PANEL CONTROLS AND CONNECTORS
(Refer to Rear Panel Diagram, Pictorial 1.2)
A description on how to use these controls and con-
nectors may be found in the "Installation" section of
this manual.
1. PREAMP OUT: The output signal (1V/600 ohms)
from the mixer/preamplifier is available at this RCA
phono jack. This signal may be used to drive an ad-
ditional external power amplifier or signal processing
device. The MASTER VOLUME is used to adjust the
signal level.
2. LINK IN/OUT: When this switch Is "IN," the
PREAMP OUT signal is connected to the POWER
AMP IN. When the switch is in the "OUT" position,
the connection between the mixer/preamplifier and
power amplifier is removed. This allows the insertion
of external signal processing devices into the signal
path. Typical processing devices would be a 1/3-oc-
tave equalizer, compressor/limiter, or filter.
eight
3. POWER AMP IN: This RCA phono jack allows
direct access to the power amplifier input when the
LINK switch is in the "OUT" position. The LOW CUT
filter (60 HZ, 6dB/octave) may still be switched in to
remove the extreme low-frequency portion of the sig-
nal. A device used to drive the power amplifier input
should have an impedance less than 10,000 ohms
and a nominal signal level of 1 volt.
4, BRIDGE IN/OUT: This RCA phono jack may be
used as an input, an output, or to interconnect the
mixing bus of the mixer/amplifier with the mixing bus
of another mixer/amplifier that has the same input
signal and impedance specifications. Nominal sig-
nal level is 100mV with an impedance of 3300 ohms.
5. AUX OUT: This RCA phono jack is in parallel with
the POWER AMP IN jack, thus has the same signal.
It would typically be used to drive an external
"booster" power amplifier, as the signal level is con-
trolled by the MASTER VOLUME and the LOW CUT
filter may be switched in the signal path.
6. LOW CUT: When switched in, the LOW CUT filter
removes low-frequency’ signals below 60 Hz at
6dB/octave. The filter does not affect the signal at
the PREAMP QUT or BRIDGE IN/OUT jacks. It is in
the signal path if an external signal is applied to the
POWER AMP IN jack, or if the output signal from the
AUX OUT jack is used for an external device.
OWNER'S MANUAL
7. EQ BYPASS: This control sets the maximum range
available to a user on the front panel tone controls.
When the control is turned fully counter-clockwise,
the tone controls function normally. When the con-
trol is turned fully clockwise, adjusting the front panel
tone controls has ‘no effect on the signal. Inter-
mediate settings of the EQ BYPASS control affect the
adjust range available on the tone controls in a
proportionate manner.
8. MUTE 1, MUTE 2: The mute functions of the plug-
in modules are activated by shorting these terminals
to ground. Grounding the MUTE 1 terminal activates
the mute function on both TOA modules as well as
one of the two mute functions available on University
modules. Grounding the MUTE 2 terminal activates
the second mute function presently available ex-
clusively on University modules.
The availability of two mute functions on University
modules allows greater flexibility in the design of
sound systems requiring various zones of paging.
Shorting these terminals to ground is normally ac-
complished by use of external switches, often part of
paging microphone assemblies.
9. CHASSIS GROUND: This binding post allows use
of stripped wire, spade lugs, or a banana plug to con-
nect the chassis ground of the unit to an external
grounding point. A good ground may usually be
made to a cold water pipe, if the pipe throughout the
building is made of copper. In many newer buildings,
the pipe is made of PVC or other plastic, so it is ad-
visable to ensure that the entire run of pipe being
used as a ground is metallic. Use of an external
ground rod, driven at least 6 feet into the earth Is a
way of ensuring a good ground.
10. BARRIER TERMINAL STRIP: Both direct and
transformer outputs of the amplifier are located on
this terminal strip. The direct output of the amplifier
is rated for a 4-Ohm load. When this output Is linked
with the OT IN terminal, using the supplied shorting
strip, the transformer outputs may be used. These
are rated for 8 ohms, 25V and 70V, with the connec-
tion from the speaker system made using the ap-
propriately marked terminal and the COM terminal.
UNIVERSITY SOUND 9000-SERIES MIXER/AMPLIFIERS
11. OUTPUT FUSE: This fuse protects the speaker
system from excessive current which might occur
under unusual operating conditions, as well as
protecting the amplifier from a short circuit or other
problem in the wiring to the speaker system which
would cause high current flow.
CAUTION: Replace this fuse only with one of the
same type and rating!
12. LINE FUSE: This fuse protects the mixer/amplifier
circuitry from current overload.
CAUTION: Replace this fuse only with one of the
same type and rating!
nine
UNIVERSITY SOUND 9000-SERIES MIXER/AMPLIFIERS
INSTALLATION
UNPACKING
Inspect the unit carefully upon receipt for possible
hidden damage which may have occurred in ship-
ping. Notify the freight company and University
Sound if any damage-is discovered. The nature of
the damage, the date of receipt and the freight waybill
number will all be required to make a claim with the
shipping company.
NOTE: The shipping container/box, packing
materials and the damaged unit must be retained for
inspection by the shipping company representative.
VENTILATION
The mixer/amplifier may be mounted on a shelf or in
a rack. For shelf or countertop mounting, rubber feet
are provided to protect the surface and to provide
elevation for air flow underneath the unit. For rack or
cabinet mounting, remove the four rubber feet from
the bottom of the chassis and install the CRMB-931
rack-mount bracket accessory kit to the unit.
If the unit is mounted in a rack or cabinet with other
heat-producing equipment, provide a space of ap-
proximately 1-3/4" (4.45 cm) between the front panel
edges for ventilation.
If the unit is placed on a countertop or a shelf,
separate it from other heat-producing equipment
with enough space for good airflow. The unit should
not be placed in an area where the temperature will
exceed 60°C (140°F).
If there is any question about the temperature of the
environment where the unit is installed, a bulb-type
thermometer should be used to measure the ambient
temperature after the system has been in operation
for several hours. The thermometer should not touch
any of the units and should be near the bottom of the
upper-most unit, if they are rack mounted. If the
temperature exceeds 60°C (140°F), the units will have
to be separated even more and it may be necessary
to add a cooling fan to provide additional air move-
ment.
CAUTION: Do not block the air intake holes in the
bottom of the chassis or the exhaust holes in the top
cover.
ten
OWNER'S MANUAL
SPEAKER OUTPUT CONNECTIONS
Either low-impedance (4- and 8-ohms) or high-im-
pedance constant-voltage speaker loads (25V and
70V lines) may be used with the mixer/amplifier.
For low-impedance speaker loads, either the direct
output or the 8-Ohm transformer output may be
used. The direct output has slightly better frequen-
cy response, as there is no transformer between the
power amplifier and the load. In order to use the
transformer outputs, the shorting strap must be in-
stalled between the terminals marked "+" and "OT
IN." See Figure 1 for wiring information.
=. Lame
EA LETS Es ete a
Ag pos peal OT IN ==
Figure 1 - Speaker Output Connections
NOTE: The LOW CUT switch should be in the CUT
position if the transformer outputs are used. The fre-
quency response of the amplifier must be limited in
the low-frequency range for proper operation with
the transformer. See Figure 2.
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Place the LOW-CUT swilch
in CUT position.
Figure 2 - LOW.CUT switch in CUT position
OWNER'S MANUAL
There are important considerations to make before
connecting the speaker(s) to the amplifier output:
1. Matching speaker impedance to the amplifier's
rated impedance. |
Power amplifiers are designed to deliver the rated
power output into a specific load impedance. Lower
impedances may reduce the maximum available
power at the rated distortion. Significantly lower im-
pedances may cause the one or more of the amplifier
protection fuses to open, especially at high output
power levels. Avoid operating this equipment under
such circumstances!
2. Power loss in speaker cable.
Ideal cable would have no resistance, thus could
deliver all the power from the amplifierto the speaker.
However, all wire has inherent resistance, therefore
causing some power loss. The longer the wire, the
greater the resistance and power loss which will
occur. Cable resistance is related to the wire gauge
(diameter) and length; as the wire diameter
decreases and the length increases, the resistance
of the cable will increase, causing increased loss be-
tween the amplifier and load.
Table 1 shows the 2-conductor copper-wire cable
lengths and gauges which may be used with various
load impedances in orderto avoid aloss of morethan
0.5 dB SPL in output.
UNIVERSITY SOUND 9000-SERIES MIXER/AMPLIFIERS
For a 1 dB loss (basically imperceptible), cable
lengths may be doubled. For a 2 dB loss, the lengths
given in the table should be multiplied by 4.4. In
general, higher load impedances will allow the use
of longer runs of smaller gauge wiring.
Low-Impedance Systems High-Impedance Systems
100W/70.7V 50W/70.7V 25W/70.7V 5W/70.7V 1W/70.7V
Resistance 24 5W/35V 12.25W/35V 6.13W/35V 1.23W/35V .25W/35V
AWG | (ohms/1000 12.5W/25V 6.25W/25V 3.13W/25V 63W/25V .13W/25V
Size feet) 4 Q an (50 Q) (100 0) (200 Q) (1000 Q) (5000 9)
10 1.00 120 240 1,500 3,000 6,000 30,000 150,000
12 1.59 75 150 940 1,900 3,800 19,000 94,000
14 2.50 48 96 600 1,200 2,400 12,000 60,000
16 4.02 30 60 370 750 1,500 7,500 37,000
18 6.39 19 38 230 470 940 4,700 23,000
20 10.1 12 24 150 300 590 3,000 15,000
22 16.2 7 15 93 190 370 1,900 9,300
Table 1 - 2-Wire Copper Cable Lengths In Feet for 0.5dB Loss in SPL
eleven
UNIVERSITY SOUND 9000-SERIES MIXER/AMPLIFIERS
3. Balancing relative speaker levels.
There is no electrically efficient way to balance and
adjust the sound levels among multiple speakers in
a low-Impedance installation. Constant-voltage,
high-impedance systems ease this process because
they employ speakers equipped with transformers
which have multiple input taps that are marked in
watts.
The "University Sound Guide to Commercial Sound
Reinforcement and Public Address Systems" (avail-
able at no charge from University Sound) covers this
subject in detail, but to quickly summarize:
Low-Impedance Speakers.
The 4- and 8-ohm output terminals on the back of the
unit are appropriate for connection to one or more
low-impedance loudspeakers or speaker systems.
For example, a single 8 Ohm speaker may be con-
nected to the COM and 8 Ohm terminals, or if more
than one speaker, as shown In Figure 3.
OWNER'S MANUAL
High-Impedance/Constant Voltage Systems.
When high-impedance speaker loads are connected
to an amplifier, smaller diameter wire may be used,
as the resistance of the cable will be small compared
to the load impedance. Usually, low-impedance
speakers are used in such systems, but matching
transformers are used at the speaker locations to in-
crease the load impedance to the desired value. Mul-
tiple transformer taps, labeled in watts, permit easy
adjustment of the individual speaker power levels.
Connection of the transformer primaries (inputs) is
shown in Figure 4.
160
AMP CUT
Parallel
Connection
ms Dry
AMP OUT 70.7 V ae
cou (D—
25 Y (D +
AMP OUT qi 25 y Low impedance
Speaker
cou D
Figure 3 - Speaker Configurations
When several low-impedance speakers are used, en-
sure that the rules of proper series and parallel im-
pedance summation are followed. This subject Is
also covered in the "University Guide.”
twelve
Figure 4 - High-Impedance/Constant-Voltage
Speaker Configurations
For proper operation, the speakers should be
equipped with transformers of the correct voltage
rating (25V or 70V). The total of all the power taps of
the transformers used in a system should be equal
to orless than the rated output power of the amplifier.
Avoid power totals that are greater than the rated out-
put power of the amplifier, since the total load im-
pedance will be too great for normal operation. This
may cause distortion or may activate some or all of
the protection circuitry of the amplifier.
OWNER'S MANUAL
USING 9000-SERIES PRODUCTS WITH EXTER-
NAL ELECTRONICS
The 9000-series mixer/amplifiers may easily be used
in systems requiring signal processing devices such
as 1/3-octave equalizers or compressor/limiters.
The mixer/amplifiers may easily be interfaced with
additional mixers or amplifiers to increase the num-
ber of input channels available, or for additional
power output requirements for larger systems.
If the external device to be used with the
mixer/amplifier Is used to modify or control the sig-
nal (signal processing), the external device(s) can
easily be inserted into the audio signal path by using
the PREAMP OUT/PWR AMP IN jacks and switching
the LINK switch to the OUT position. The nominal
signal output level of the PREAMP OUT (1V/600
ohms) is appropriate for use with all professional
electronic equipment. The external devices should
be adjusted so that unity gain is maintained.
The output signal of the external device connects to
the PWR AMP IN jack.
Refer to Figure 5 which shows a mixer/amplifier with
a 1/3-octave equalizer inserted into the audio signal
path of the mixer/amplifier.
UNIVERSITY SOUND 9000-SERIES MIXER/AMPLIFIERS
The BRIDGE IN/OUT jack allows the mix bus of mul-
tiple mixer/amplifiers to be tied together. Any signals
present on the mix bus of one unit will be present on
the mix buses of all the other units. A common use
for this feature is where more inputs are required than
are present on one mixer/amplifier. The MASTER
VOLUME control on each unit will control the signal
level going to the power amplifier in that unit, allow-
ing ease of setting the level for different zones with
one amplifier per zone.
Refer to Figure 6 which shows used of bridged
mixer/amplifiers in a sound system.
BRIDGE IN/OUT
56056
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BRIDGE INOUT
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PRE-OUT
PWR AMP
IN
[65555]
800 pd
ee On
Cok
Figure 5 - External Equalizer Connections
NOTE: The PREAMP OUT signal level is affected by
the MASTER VOLUME control setting.
Figure 6 - Bridged Mixer/Amplifier Connections
The AUX OUT jack is in parallel with the AMP IN jack.
This jack may be used to connect to an external
power amplifier or other devices, such as tape re-
corders.
thirteen
UNIVERSITY SOUND 9000-SERIES MIXER/AMPLIFIERS
MUTING and REMOTE MASTER VOLUME
Activation of the muting circuits is normally ac-
complished by using switches to short the MUTE 1
and/or MUTE 2 terminals to ground. See figure 7 for
the wiring diagram.
1000
№
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MUTE 1 o 3
mn |
A 2 MUTE2 MUTE1
me LR
10K Ohms
OWNER'S MANUAL
da Pati pace ix Reiten
ARgamabion | [ipprex] |ARsswsiics | (port)
=) лав | 9K |-24d8 | 2x
wren |) 208 | 7x |-2708 | 1.7%
wrez | (Y -308 | 4.6K |-3008 | 14
LE -608 | 4.1K |-3398 | 1.1
enouMo | (©) -9dB | 3.7K | -36d8 | 8000
— -1208 | 3.3 |-3908 | 50011
REMOTE ra | (X) =3 вещ | +1598 | 3.0 |-4208 | 2000
rd „ВоВ | 2.7K | -45d8 | SHORT
ED ® 2188 | 2.3K
Figure 7 - Muting and Remote Volume Control
Connections
The REMOTE VOLUME terminals allow use of a
potentiometer or fixed resistors to remotely control
the overall volume of the mixer/amplifier. To obtain
the maximum range of control possible with a poten-
tiometer, a resistance value of 10,000 ohms or
greater should be used. The potentiometer should
be of the "linear" type, for proper operation. If fixed
values of attenuation are desired, resistors may be
used to remotely set the amount of attenuation.
See Table 2 for the amount of attenuation with
various resistors.
fourteen
Table 2 - Fixed Resistor Values and Connections
for Remote Volume Control
RACK MOUNTING
To mount the 9000-serles mixer/amplifiers In a
standard 19" rack, the optional CRMB-931 mounting
kit should be used. If multiple units are mounted in
the same rack, vent panels should be installed be-
tween the units to allow space for ventilation. See
Figure 8 for information on installing the rack-mount
bracket Kit.
Figure 8 - Installing Rack-Mount Bracket Kit
OWNER'S MANUAL
INSTALLING INPUT MODULES
a
Input modules are easily installed into the mainframe.
Carefully slide the module into the appropriate input
port, making sure that the circuit board of the module
is within the guide rails.
Secure the module with the supplied screws. See
Figure 9 for reference. All unused input ports should
be covered with the blank panels supplied with the
mixer/amplifier.
Figure 9 - Installing Input Modules
NOTE: Input modules should not be inserted or
removed while the unit is turned on!
MAINTENANCE
OUTPUT FUSE REPLACEMENT
A fuse is provided in series with the output of the
amplifier to protect the load. If you need to replace
this fuse, use only a fuse of the proper type and
rating. The proper output fuse for the units are:
8003 -3AG 250V 5A
9006 - BAG 250V БА
9012 - 3AG 250V 10A
UNIVERSITY SOUND 9000-SERIES MIXER/AMPLIFIERS
Ifthe fuse continues to open after itis replaced, check
the speaker wiring for a short circuit, or a speaker
system wattage requirement that exceeds 30 watts
(9003), 60 watts (9006) or 120 watts (9012).
If there are no apparent problems inthose areas, take
the unit to the nearest qualified service/repair facility
where the unit may be checked for proper operation,
or repaired if necessary.
LINE FUSE REPLACEMENT
If the line fuse opens, the OUTPUT LEVEL meter will
no longer be illuminated and ac mains power to the
internal circuitry will be interrupted. If this happens,
turn the power switch off and remove the line cord
plug from the AC outlet. Remove the defective fuse
from the back panel holder and replace it with a fuse
of the proper type and rating. If the fuse continues to
open when power is applied to the unit, take the unit
to the nearest qualified service/repair facility for
repair. Use of improper substitute fuses which
causes damage to the unit will void the warranty.
fifteen
UNIVERSITY SOUND 9000-SERIES MIXER/AMPLIFIERS
SERVICE AND WARRANTY
Replacement Parts - a
Most of the components used in the mixer/amplifier
are standard and available from electronic parts
stores. If you replace transistors, use those made by
the specified manufacturer. Parts from another
manufacturer, or parts which are of the "universal re-
placement” variety may not work properly or as
reliably.
WARRANTY (Limited) University Electronic Com-
ponents are guaranteed for one year from date of
original purchase against malfunction due to defects
in workmanship and materials. If such malfunction
occurs, unit will be repaired or replaced (at our op-
tion) without charge for materials or labor if delivered
prepaid to University Sound. Unit will be returned
prepaid. Warranty does not extend to finish, ap-
pearance items, or malfunction due to abuse or
operation under other than specified conditions, nor
does it extend to incidental or consequential
damages. Some states do not allow the exclusion of
limitation of incidental or consequential damages,
so the above exclusion may not apply to you. Repair
by other than University Sound will void this guaran-
tee. This warranty gives you specific legal rights, and
you may also have other rights which vary from state
to state.
sixteen
OWNER'S MANUAL
Service and repair address for this product:
University Sound, Inc.
13278 Ralston Avenue
Sylmar, CA 91342-7607
Phone: (818)362-9516
Fax: (818)367-5292
Specifications subject to change without notice.
PARTS LIST
NO
1
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
DESCRIPTION
FRONT PANEL
FRONT CHASSIS
MAIN CHASSIS
TOP COVER
VU METER
PUSHBUTTON
POWER SWITCH
LAMP
KNOB
VR CONTROL P. C. B.
T3x 12 SCREW BLK
T3X 12 SCREW
MAIN P. C. B.
POWER TRANSFORMER
OUTPUT TRANSFORMER
HEATSINK
T3X6 SCREW BLK
MOTHERBOARD P. C. B.
MODULE CARD BOX
MUTE/REMOTE P. C. B.
IN/OUT P. C. B.
POT LINEAR 50K
PLASTIC FOOT
FUSE HOLDER
FUSE 2A AG 250V
PART NO.
700—0011—00
700—0012—00
700—0013—00
700—0014—00
160—6000—00
080 — 6001 — 00
090—6002—00
160—6012—00
080 — 6002 —00
800 — 9555 — 00
170—6018—03
170—6018—02
800— 9556 — 00
050—6007— 00
050 — 6008 — 00
700—0015—00
170—6018—04
800—9557—00
700—9502—00
800 — 9558 — 00
800— 9559 —00
070— 6009 — 00
160—6001—00
120—6006—00
120—0515—00
ли
=
= E
= A
q
PARTS LIST
NO
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
DESCRIPTION
FUSE 5A AG 250V
ACCESSORY OUTLET
LINE CORD
OUT TERMINAL P. C. B.
POT TAPER 10K
LOCKING NUT
3/8 INT TOOTH WASHER
MOUNTING NUT |
WASHER
POWER TRANSISTOR
POWER TRANSISTOR
BARRIER STRIP (5 POS)
1 6—32x 3/4 SPACER
#6—32% 1/4 SCREW
T3Xx12 SCREW BK
13xX6 SCREW BK
PART NO.
120—0446—00
120—6007—00
120—0454—09
800 —9560—00
070—6010—00
170—6017—00
173—381 — 00
170—6017—01
173—38DW—00
100—6018—00
100—6019—00
110—6030—00
175—6002—00
170—6000—00
170—6018—00
170—6018—01
BLES
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MAIN BOARD 9003
MUTE REMOTE PCB 9003
IN/OUT PCB 9003
«тет,
MOTHER BOARD 9003
LAMP METER PCB 9003
POWER S/W PCB 9003
OUT TERMINAL 8003
VR CONTROL PCB 9003
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