Electro-Voice 7300 User manual

E
ElectroVoice®
i7300 ..
"'---'- ........ ®STEREO POWER AMPLIFIER
OWNER'S MANUAL
II
(7300
STEREO POWER AMPLIFIER
MA~TER COpy

I. INTRODUCTION
The EV 7300 was designed to deliver exceptional
performance and reliability
at an affordable price. Each
channel delivers 200 watts of power into 8 ohms, and
300 watts into 4ohms over the full audio frequency
range.
In the mono bridge mode, the 7300 can deliver
over 600
watts.
The APX octal crossover accessory provides the
convenience of on-board, bi-amp capability.
The APX
module has 24 preset selectable crossover frequencies
from
50 Hz to 10,000 Hz. Simply plug the module into
the octal sockets provided on the rear of the amplifier
and your system
is bi-amp ready.
The 7300
is an addition to the growing family of
Electro-Voice electronic products. We would appreciate
any comments you have regarding the performance,
features or reliability of the 7300.
(

IE tl7300 STEREO POWER AMPLIFIER
TABLE OF CONTENTS
Table 01 Contents
INTRODUCTION
1.
DESCRIPTION -FRONT PANEL
1A. Power Switch
1
B.
Power Status Indicator
1C. Channel Attenuation
10. Clip Indicator
1
E.
Protect Indicators
2. DESCRIPTION -REAR PANEL
2A. Input Connectors
2B. Octal Input Sockets
2C. Dual Bridge Mode
20. Output Connectors
3. SPECIFICATIONS
4. INSTALLATION
4A. Operating Cautions
4B. Input Connections
4C.
Output Connections
40. Grounding
4E.
Ventilation
5. OPERATION
5A. Dual/Stereo Mode
5B. Bridge Modß
5C. APX Crossöver Option
50. Alternate Operating Voltage
6. TROUBLESHOOTING
6A. Protection
7. SCHEMATIC
8. SERVICE/WARRANTY INFORMATION
*** WARNING ***
The service information contained within this document is for use
only by Electro
.. Voice, Inc. authorized warranty stations and
qualified service personnel.
nnA

IE~17300 STEREO POWER AMPLIFIER
1C. 1A.
Description
1E. 10. 18.
FIGURE 1 - Front Panel View
DESCRIPTION
1. Front Panel
1
A. Power Switch -The power switch turns the
amplifier
onand off.
1 B. Power Status Indicator - This LED indicates
when the unit is
on.
1C. Input Attenuators -Clockwise rotation increases
the amount of amplifier gain.
1
D. Clip Indicators - When the amplifier is driven into
c1ipping, the clip indicator will illuminate. To avoid
distortion reduce the input
level until the LED's no
longer light.
1
E. Protect Indicators - The protect light illuminates
when the amplifier overheats or when shorted
loads or
dc is detected on the amplifier output.
Arelay automatically disconnects the load from
the channel when aproblem
is detected. The
amplifier will reset itself when the problem
is
corrected. See the Troubleshooting section for
problem solving.
<.
(

IEtl7300 STEREO POWER AMPLIflER
28.
20.
Descrlptlon
(
2A. 2C.
FIGURE 2 - Back Panel View
DESCRIPTION
2. Back Panel
2A. Input Connectors -Located
on the left side are
two 3·pin·XLR-type connectors and two balanced
quarter-inch phone jacks: The inputs can also be
unbalanced.
See Figure 3for typical input
connections.
2B. Octal Accessory Sockets -Located above the
input jacks, accesscry octal sockets
are provided
for the
APX crossover module. Twenty-four
crosscver frequencies are available from 50
Hz
to 10,000 Hz.
2C. Dual/Mono Bridge Mode -The mode switch
located to the right
cf channel 1input selects
stereo mode er bridge-mode without any
additional patching.
2D. Output Connectors -The speaker connectors
are heavy-duty five-way binding posts. For
protection, there
is abracket on each side of the
bin ding posts.

1~17300 STEREO POWER AMPLIFIER
SPECIFICATIONS
Specifications
RF interference
Over temperature
CONDITIONS -
1,0 dBu ... 0.775 V rms.
2, Dual·mode ratings are for each channel.
3. Both"channels operating at rated output power unless noted.
4. 120 volt ac line voltage maintained throughout testing.
CONTINUOUS RATED OUTPUT POWER-
(20 Hz, referenee 1kHz)
Dual Mode, 4Ohms:
300 watts at <0,10% THD
Bridge Mode,8 Ohms: 600 watts at <0.10% THD
Dual Mode, 8Ohms: 2oo,watts at <0.05% THD
Bridge Mode, 16 Ohms: 400 watts at <0.05% THD
MAXIMUM MIDBAND OUTPUT POWER -
(referenee 1kHz, 1%THD)
Dual Mode, 4Ohms:
400 watts
Bridge Mode, 8Ohms: 800 watts
Dual Mode, 8Ohms:
250 watts
Bridge Mode, 16 Ohms: 500 watts
DYNAMIC HEADROOM (referenee 1kHz) -
Dual Mode, 4Ohms: >1.25 dB
Bridge Mode, 8Ohms: >1.25 dB
Dual Mode, 8Ohms: >
1.0 dB
Bridge Mode,' 16 Ohms: > 1.0 dB
POWER BANDW10TH (+ 0, - 3 dB, reference 0dB at 1kHz) -
Dual Mode, 4' Ohms: 7
Hz-70 kHz
Bridge Mode, 8Ohms: 7 Hz-60 kHz
Dual Mode, 8Ohms: 7
Hz-85 kHz
Bridge Mode, 16 Ohms: 7 Hz-65 kHz
VOl TAGE GAIN (reference 1kHz) -
Dual Mode: 32.0 dB
Bridge Mode: 38.0 dB
INPUT SENSITIVITY
FOR RATED OUTPUT POWER-
(referenee 1kHz, ±0.3 dB)
Dual Mode, 4Ohms: 0dBu (0.775 V rms)
Bridge Mode, 8Ohms: 0dBu (0.775 V rms)
Dual Mode, 8Ohms: + 3 dBu (0.902 V rms)
Bridge Mode, 16 Ohms: +1.3 dBu (0.902 V rms)
MAXIMUM INPUT lEVEL (referenee 1kHz) -
+20 dBu (7.75 V rms)
INPUT IMPEDANCE (per ehannel, 20 Hz-20 kHz) -
Balaneed: >
30 kilohms
Unbalanced: >
15 kilohms
PHASE RESPONSE (at rated
output power, any mode) -
at 20 Hz: + 15 degrees
at 20 kHz: -15 degrees
THD (at rated
output power)-
Dual Mode, 4Ohms, 20 Hz-20 kHz: < 0.1 0%
Bridge Mode, 8Ohms, 20 Hz-20 kHz: <0.10%
Dual Mode, 8Ohms, 20
Hz·1 kHz: <0.01%
Dual Mode, 8Ohms, 1kHz·20 kHz: <0.05%
Bridge Mode, 16 Ohms, 20 Hz·1 kHz: <0.01%
Bridge .Mode, 16 Ohms, 1kHz·20 kHz: <0,05%
IMD
[SMPTE1 (at rated output power) -
Dual Mode, 4Ohms: <0.05%
..
Bridge Mode, 4Ohms: <0.05%
Dual Mode, 8Ohms: <0.03%
Bridge JAode, 16 Ohms: <0.03%
TIM [OlM 1001 (at rated output power) -
Dual Mode, 4Ohms: <0.05%
Bridge Mode, 8Ohms: <0.05%
Dual Mode, 8Ohms: <0.03%
Bridge Mode, 16 Ohms: <0.03%
AlSE TIME (10%
tc 90%, st rsted output power) ~
Dual Mode, 4Ohms: < 5 IJ.sec
Bridge Mode, 8Ohms: <6llsec
Dual Mode, 8Ohms: < 4.5 Ilsec
Bridge Mode, 16 Ohms: <5.5 IJ.sec
SlEW RATE (at rated output power) -
Dual Mode, 4Ohms:
>20 VfJJsec
Bridge Mode, 8Ohms: >30 VflJ.sec
Dual Mode, 8Ohms: >30 VflJ.sec
Bridge Mode, 16 Ohms: >60 VflJ.sec
DAMPING FACTOR -
Dual Mode, 4Ohms, 20 Hz-1 kHz: >100
Dual Mode, 4Ohms,
'20 kHz: >40
Bridge Mode, 8Ohms, 20 Hz·1 kHz: >200
Bridge Mode, 8Ohms, 20 kHz: >
50
Dual Mode, 8Ohms, 20 Hz-1 kHz: >200
Dual Mode, 8Ohms,
20 kHz: >80
Bridge Mode, 16 Ohms, 20
Hz-1 kHz: >400
Bridge Mode, 16 Ohms, 20 kHz: > 100
CHANNEl SEPARATION -
(below rated
output power, single channel·operatlng)
> 80 dB att kHz
NOISE (below rated output power, A.welghted, any mode) _
>
100 dB
AMPLIFIER PROTECTION -
Excessive output voltage
Shorted loads
Excessive phase shift
LOAD PROTECTION -
Startup/shutdown
transients Infrasonic signals
dc fault Low ac !ine voltage
COOLING -
Heatslnk: Thermally
equafized 3AG-inch aluminum,
black anodized heatsink
Dual-Speed Fan:
106 CFM (high speed), minimum Iife rating of
20,000 hours at 72°C, or 43,500 hours at
25°C ambient temperature
OUTPUT TOPOlOGY -
True complementary symmetry
OUTPUT TYPE -
Dual Mode: Unbalanced, each channel
Bridge Mode: Balanced
OUTPUT DEVICES -
Sixteen 25O-watt, 250-Vf16-A, TO-3 transistors
CONTROlS AND SWITCHES -
Input
level controls <two), rear
Mode
switch, rear
Power
switch, front
FRONT-PANEL INDICATORS -
Power
LED
. Cfip LED's (two)
!Protect LED's(two)
CONNECTIONS -
Input: 6-terminal barrier strip, female XLR·type connectors (two)
Output: 4·terminal barrier strip
Power:
8-foot, 3-wire, 17-GA power cord with NEMA 5-15 plug
POWER REQUIREMENTS -
100, 120, 200,220, 240 V ac, 50/60 Hz, 900 watts
POWER CONSUMPTION/HEAT PRODUCED -
(both channeIs operating dual mode wlth 1kHz Input signal
at
stated output power Imo 4ohms, or bridge mode Into 8ohms)
Idle:
130 wattsf0.442 kBTU/hr
Y3 Power: 900 wattsf2.380 kBTUfhr
Y2 Power: 1060 wattsl2.584 kBTU/hr
Rated Power: 1430 wattsl2.822 kBTUfhr
Maxlmum.Mldband Power: 960 watts/1.564 kBTUfhr
OPERATING TEMPERATURE
RANGE-
Up to 60°C (140°F) ambient
DIMENSIONS -
Helght: 13.3 cm (5
1
/4 in.)
Wldth: 48.2 cm (19 in.)
Depth: 32.4 cm (12
3
/4 in.)
COLOR -Gray/black
ENCLOSURE -
Rack mount chassis, 16-GA steel bottomfsides, V,G-inch
aluminum topfback, 3AG·inch 6061-T6 aluminum front panel
SHIPPING WEIGHT - 21,8 kg (48 Ib)
NET WEIGHT -17.7 kg (39 Ib)
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~ 7300 STEREO POWER AMPLIFIER
Installation
LOADS
Hote 1, Not rlcomm.nded rar cable run, Ollt( 100 fI l30ml
Nole 2, Not recomm.nded for etble run. over I fI (2ml
CH.2
Dual Mode
CH.1
CH.2
--
__ HIGHS
~
Compresslon
Driver
f-.------1+
FIGURE 3 - Typical Input Connections
4. INSTALLATION
4A. Operating Cautions
a. Da not operate the amplifier in acompletely c1osed,
unventilated housing.
b. Da not connect the outputs of the channels in parallel.
c. Da not connect the outputterminals to abattery, power
supply, or the power mains. Damage caused by such
hookup
is not covered by the warranty.
d. Be careful when making connections, selecting signal
sources and controlling the output
level.
e. Da not ite the input signal ground to the ground lead
of
an output. Ground-loop-induced oscillations may
occur.
f. Ensure that the main ac power is within 10% of
selected voltage
and frequency. Failure to operate the
unit within these limits voids the warranty.
g. Use only the proper size'mains fuse for the selected
ac voltage.
h. Da not connect either side of the loudspeaker cable
to ground when operating the unit
in bridged mode.
The bridged mode
is balanced to ground.
i. Make certain that test equipment is not graund
referenced when testing the unit
in the bridged mode.
j. Tampering with the circuit er repair by unauthorized
personnel will void the warranty
of the unit.
slx
FIGURE 4 - Typical Output Connections
4B. Input Connections
Two conductor shielded low-impedance cable
is recom-
mended for input lines to the amplifier input.
Pin 2 Of the
XLR·type connector
is high (+), pin 3 is low (-), and
pin 1
is ground. The V4-inch jack may be used as alow
impedance input. Tip
is high (+), ring is low (-). and the
sleeve
is ground. See Figure 3.
High impedance lines may be connected to the amplifier
inputs with asingle-conductor low capacitance sheilded
cable of 30 feet or
less in iength. Atwo conductor 1/4-inch
plug will automatically unbalance the input. To help avoid
hum or buzz
in the output, be certain that all input cables
fre physically separated from power wiring er power
transformers.
4C. Output Connections
Binding posts are provided for speaker terminations, the
red
post is high (+)and the black post is low (- ). The preferred
connector
is ahigh quality dual banana plug. See Figure 4
for typical output configurations.
Before making output connections, the input attenuators
should be turned off (full counterclockwise), doing
so will
eliminate any chance of loud
bl asts cr damage to the
loudspeaker.
Power loss in the speaker wire. The impedance
of the
speakerconnecting wire would ideally be zero, so
all of the
amplifier output power would be delivered
to the speaker
load. However,
the impedance of the speaker wire can
become asignificant percentage
of the speaker impedance.
Thus, part
of the amplifier power is "lost" in the wire (in the
form
of heat) and the power delivered to the speaker system

IE1!1730o STEREO POWER AMPLIFIER
Impedance
AWG
Reslstance
Size
(ohms/1000 feet) 40 80 160
10 1.00.
120 240 480
12
1.59
75 150 300
14
2.50
48 96 190
16
4.02 30 60 120
18
6.39 19
38
75
20
10.1 12
24
48
22
16.2 7 15 30
TABlE I - Cable Selection Chart
is correspondingly reduced. Wire impedance is higher when
using long wire runs and small wire sizes.
Table Ishows the two-wire cable (copper) lengths
permissable
for anumber of wire sizes and speaker
impedances, to avoid aloss of more than 0.5 dB.
For aloss
of 1dB (basically imperceptible) lengths may
be doubled. '
For a2-dB loss, the lengths would be multiplied by 4.4.
In general, note that the higher load impedances allow much
longer smaller-gauge wiring to be used,
40. Grounding
The chassis
of the unit should be grounded. Connecting the
chassis grounds of additional audio equipment
to the chassis
ground of the amplifier may help reduce noise and hum.
4E. Ventilation
In order to offset the heat generated bythe power amplifier,
it is necessary to provide ample ventilation around the unit.
Avoid blocking or impeding the vent slots of thechassis.
Locate
the unit where it is free from direct sunlight, humidity,
dust or vibration to help prevent problems
wh ich might be
caused
by the environment.
5. OPERATION
5A. Dual/Stereo Mode:
In the dual or stereo mode the channels may be operated
independently. Before hook-up .make sure that the mode
switch
is in the dual position and that the level controls are
down
(FCCW). Connect the inputs and outputs (See
Figures 3and
4). Turn the power amp on and slowly
increase level until the desired output power
is obtained.
lf either (clip) LED iltuminates, reduce the output with the
input attenuators or reduce the source signal level.
5B. Bridge Mode:
Input connection should
be made into channel1 only. 00
not make any input connections into channel two. Move the
mode switch to bridge mode and make sure both level
controls
are down (FCCW). Connect the speaker ac ross the
two red binding posts. Channel 1red post
is high (+),
channel 2red post is low ( -). 00 not make aconnection
Operation
to either of the black binding posts, Switch power on and
slowly increase amplifier channel 1level control until the
desired output power
is obtained, If the clip LEO indicators
come
on, reduce the power amp level control or the source
signal level.
5C. APX Crossover Option:
The
APX crossover is a 24 dB per octave Linkwitz-Riley filter
network. There are
24 selectable frequencies from 50 Hz
to 10,000 kHz,
*** CAUTION ***
No user serviceable parts inside. Hazardous voltage
and
currents may be encountered within the chassis.
To avoid electricshock, do not perform any servicing
unless you are qualified to
do so.
50. Alternate Primary Voltage
The amplifier can be powered with line v6ltages other than
120 volts by altering the primary wiring of the power
transformer. Table Illiststhe primary wire color, the terminal
block
(TB), and the position of the TB the wire should be
located
in for operation at the desired voltage.
To alter the transformer primary wiring configuration
use the
following procedure:
1. Oisconnect the amplifier from the ac power source.
2. Remove the ten screws securing the top cover. There
are three screws on each side; two screws on the rear
along the bottom edge, and the two innermost screws
inset into the top strip on the front panel. See Figure 5
for exact screw locations.
3. Discharge each large capacitor carefully through a
150-ohm, 2-watt resistor for
at least one minute.
See Figure
6.
4. Locate the two voltage-selection terminal blocks
mounted next to each other
on the side of the chassis
between the power transformer and the large capacitor.
5. The transformer has six primary leads. Disconnect the
primary leads of the power transformer by pulling each
wire firmly to disengage it from the terminal block.
Note: The primary lead colors are black, brown, white,
black/white, brown/white and white/black.
6. Select the desired operating voltage on Table
11 and
reconnectthe wires accordingly. Push each wire firmly
into the block until
it snaps into place.
7. Relocate the fan wires according to the wiring chart.
8. Install the correct line fuse (values
in Table 111).
9. Plug the amplifier into avariac and sweep the mains
voltage from
zero to full operating voltage while monitor-
ing the amplifier's dc
rail voltages. The dc rail voltage
should be ±
78 Vdc, ± 5% at the selected primary
voltage.
10. Reinstall the top cover with the ten screws.

1"""17300 STEREO POWER AMPLIFIER
(
100 V
TBI TB2
•
•
5 FAN (YL)
WH
WH/BLK 7
FAN (YL)
8BRNIWH
9 BRN
0
240 V
TBI TB2
TBI T82
TBI TB2
220 V
o0
o0
Factory Wlrlng (120 V)
200 V
1UNE GAP (BLK)
2NEUTRAL (WH)
TBI TB2
o0
o0
o0
TBl TB2
Permanent Connections·
(BLK) PWR SW
(BLK) UNE CAP
(BLK) FUSE
(BLKIPWR SW
•Da NOT MOVE THESE WIRES, THEYARE COMMON Ta All PRIMARY VOLTAGES
TABLE 11
Prlmary Power Converslon Chart for 100·, 120-, 200-, 220-, and 240-V, 50/60-Hz Operation
3 SCREWS
L
\ t
UPPER 2 SCREWS
FIGURE 5 - Top Cover Removal
3 SCREWS
J
Une Fuse.
314 Serles
lIne VOltag8
Normal·Blo
100 V ac
10 Al250 V
120 Vac 10 Al250 V
200 Vac 5 Al250 V
220 Vac 5 Al250 V
240 V ac 5 Al250 V
TABLE 111
Maln Fuse Selection Guide
1N __ w .. orlvlf
Ill'DI __ lMlo<Il.to
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FIGURE 6
Capacltor Discharglng (
elght

IEtl7300 STEREO POWER AMPLIFIER
Troubleshootlng ISchematic
6. TROUBLESHOOTING
a. Be systematic; check one thing at time; check the
obvious.
b. Verify that the input connections are properly made.
See Figure 3, page 4.
c. Verify that the output connections are properly
made.
See Figure 3, page 4.
d. Check input and output cables for proper wiring.
e. Check the signal source and theload. Make sure
the level controls are up.
f. Check that the bridge mode switch is in the desired
position.
g. If there are no lights, check ac power switch and
power
fuse.
h. Fuses that blow instantlyon turn-on are asign of
internal distress, and you should
refer the unit to
aquallfied service station.
6A. Protection
1I the amplilier goes into "protect" mode it is probably lor one
01 the following reasons:
Very Low Impedance Load or Shorted Load. Disconnect the
speaker lines Irom the power amplilier and allow the amplilier
to cool.
If the protect LEDs go out after ashort period of time
check the speakers or decrease the number
01 speakers
attached
to the outputs.
De on the Output of the Amplifier. Disconnect the speaker
lines from the power amplilier and allow the amplifier
to cool.
If the protect LEDs do not go out after ashort period of time
it is Iikely that adc vo~age is on the output and that the amplifier
will need servicing.
7. SCHEMATIC
Al~ RfAB INPUT 89
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5. OHE OUTPUT SECT10H OF lWO Sl«lWN.
4. CHANHEl. 2 OESIGNATORS IN (XXX).
BEGIN IN 100 SERIES.
3. All RESISTORS IN OHMS. V.W. 51lo-
REAR INPUT BOARD ONLY.
2. AlL CAPACITORS IN MICROFARADSNOLT.
1. All RESiSTORS IN OHMS. Y1W, 5%.
NOTES: UNLESS OTHERWISE SP€CIFIEO
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fEil 7300 STEREO POWER AMPLIFIER
8. SERVICE/WARRANTY INFORMATION
WARRANTY (Limited) - Electro-Voice Professional Sound
Reinforcement Electronic Components are guaranteed tor
two years
from date of original purehase against malfunc-
tion
due to defects in workmanship and materials. It such
malfunction occurs, unit will be repaired or replaced (at our
option) without charge for materials
or labor if delivered
prepaid
to the proper Electro-Voice service facility. Unit will -
be returned prepaid. Warranty does not extend to finish,
appearance items or malfunction due to abu se or opera-
tion under other than specified conditions, nor does it extend
to incidental or eonsequential damages. Some states do not
allow the exclusion or limitation of incidental or consequential
damages, so the above exclusion may not apply to you.
Repair by other than Electro-Voiee or its authorized service
ageneies will void this guarantee. A list of authorized service
centers is available from Eleetro-Voice, Inc., 600 Ceeil Street,
Buchanan, MI 49107 (AC/616-695-6831); Eleetro-Voiee,
Ine., 3810 148th Avenue N.E., Redmond, WA 98052
(AC/206-881-9555); Electro-Voiee,
Inc., 10500 W. Reno,
Oklahoma City, OK 73128 (AC/405-324-5311); and/or
Eleetro-Voice
West, 8234 Doe Avenue, Visalia, CA 93291
(AC/209-651-7777). This warranty gives you specific legal
rights,
and you mayaiso have other rights which vary from
state to state.
ServicelWarranty
FACTORY SERVICE ADDRESS
Electro-Voiee, Inc.
Service Department
10500
West Reno
Oklahoma City, OK 73125
AC/405-324-5311
Specifications subject
to change
without
notiee.
(
EI!
600 Ceell Street. Buchenan. Mlchlgan 49101, Phon. [phone]. TWX: 810-210-3135
8234 Doe Avenue. Visalia, California 93291, Phone (209)651·7777, TLX 172 119
Electro·Voice Div., 345 Herbert SI., Gananoque, Ontario. Canada K7G 2V1. Phone (613)382·2141. TLX 389 066 3245
Electro-Voice. S.A., Keltenslrasse 5. CH·2563IPSACH, Switzerland, Phone (41)32·51·68·33. TLX 845 934 045. FAX [phone]·21
Electro·Voice, Ud., 2·5·60 lzumi, Suginami·ku. Tokyo, Japan 168, Phone (81)3·325·7900. TLX 781 2322494
Eleclro-Voice Germany, Larchenstrasse 99, 6230 FranklurtJMain BO, Germany. Phone (49)69·380-100, TLX 841 413847
... .1 Electrp·Voice Pty. Ud., 59 Waratah Street, Kirrawee, N.SW. 2232, Australia. Phone (61)2·521·5322, TLX 790 26793
(
Part Number 530990 ©Electro-Voiee,
Ine. 1987 L1THO IN U.S.A.

AZ-REAR INPUT
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5. ONE OUTPUT SECTI
4. CHANNEL 2 ON OF TWO SHOWN
BEGIN IN 1~~~~I~~TORS IN (XXX), .
3. ALL RESISTORS I .
REAR INPUT BOAR
N
OHMS, V.W 5%-
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2. ALL CAPACITORS IN M .
1. ALL RESISTORS IN OH ICROFARADSNOLT.
NOTES: UNLESS OTHE MS, lhW, 5%.
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