performance and reliability
channel delivers 200 watts of power into 8
300 watts into 4 ohms over the full audio frequency
range.
over 600
The
APX
convenience of on-board, bi-amp capability.
module has 24 preset selectable crossover frequencies
50Hzto
from
the octal sockets providedonthe rear of the amplifier
and your system
The 7300
Electro-Voice electronic products. We would appreciate
any
comments you have regarding the performance,
features or reliability of the 7300.
was
designed to deliver exceptional
atanaffordable price.
ohms,
In
the mono bridge mode, the 7300 can deliver
watts.
octal crossover accessory provides the
The
10,000
isanadditiontothe growing family of
Hz.
Simply plug the module
is
bi-amp ready.
Each
and
APX
into
(
Page 3
IEtl7300
STEREO
POWER
AMPLIFIER
Table01Contents
TABLE OF CONTENTS
INTRODUCTION
1.
2.
3.
4.
5.
DESCRIPTION -FRONT PANEL
Power Switch
1A.
Power Status Indicator
B.
1
Channel Attenuation
1C.
10. Clip Indicator
Protect Indicators
E.
1
DESCRIPTION -REAR PANEL
Input Connectors
2A.
Octal Input Sockets
2B.
Dual Bridge Mode
2C.
Output Connectors
20.
SPECIFICATIONS
INSTALLATION
Operating Cautions
4A.
Input Connections
4B.
Output Connections
4C.
40.
Grounding
Ventilation
4E.
OPERATION
Dual/Stereo Mode
5A.
5B.Bridge
APX Crossöver Option
5C.
Alternate Operating Voltage
50.
Modß
6.
7.
8.
TROUBLESHOOTING
Protection
6A.
SCHEMATIC
SERVICE/WARRANTY INFORMATION
***
WARNING
***
The service information contained within this documentisfor use
..
only by Electro
Voice, Inc. authorized warranty stations and
qualified service personnel.
nnA
Page 4
IE~17300
STEREO
POWER
AMPLIFIER
Description
DESCRIPTION
10.
1A.
18.
1C.
1E.
FIGURE 1 -Front Panel View
1.Front Panel
1
A.
Power Switch -The power switch turns the
amplifier
1B.Power Status Indicator -
when the unit is
1C.
Input Attenuators - Clockwise
the amount of amplifier gain.
1
D.
Clip Indicators-
c1ipping,
distortion reduce the input
longer light.
1
E.
Protect Indicators -
when the amplifier overheats or when shorted
loads or
A relay automatically disconnects the load from
the channel when a problem
amplifier will reset itself when the problem
corrected. See the Troubleshooting section for
problem solving.
onand
the clip indicator
dcisdetectedonthe amplifier output.
off.
This
on.
rotation
When
the amplifierisdriven into
will
illuminate.Toavoid
level
until
The
protect light illuminates
is
LED
indicates
increases
the LED's no
detected. The
<.
is
(
Page 5
E
I
tl7300
STEREO
POWER
AMPLIflER
Descrlptlon
28.
2A.
2C.
FIGURE 2 -
Back
Panel
DESCRIPTION
20.
View
2.
Back Panel
on
the
2A.Input Connectors - Located
two 3·pin·XLR-type connectors and two balanced
quarter-inch phone jacks: The inputs can also be
See
unbalanced.
connections.
2B.Octal Accessory Sockets - Located above the
input jacks, accesscry octal sockets
for the
crosscver frequencies are available from 50
to 10,000
2C.Dual/Mono Bridge
located to the right
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
bin
Ensure that the main ac poweriswithin 10% of
selected voltage
unit within these limits voids the warranty.
g.
Use only the proper size'mains
ac voltage.
h.
Da not connect either side of the loudspeaker cable
to ground when operating the unit
The bridged mode
i.
Make certain that test equipmentisnot graund
referenced when testing the unit
j.
Tampering with
personnel will void the warranty
the
amplifierina completely
the
outputs of
the
outputterminalstoa battery, power
is
not covered by the warranty.
and
frequency.
the
channelsinparallel.
Failuretooperate the
fuse
is
balancedtoground.
in
the
circuit er repair by unauthorized
level.
for
in
bridged mode.
the
bridged mode.
of
the
c1osed,
ground lead
the selected
unit.
CH.2
FIGURE
Compresslon
Driver
f-.------1+
4 - Typical Output Connections
__
--
~
HIGHS
4B.Input Connections
is
Pin2Of
(-),
(-).
and the
recom-
the
and
Two conductor shielded low-impedance cable
mended for input lines to the amplifier input.
XLR·type connector
is
pin 1
ground.
impedance input. Tip
is
sleeve
ground.
High impedance
is
high
(+),
pin 3islow
The
V4-inch
is
See
lines
jack may be usedasa low
high
(+),
ringislow
Figure
3.
may be connected to the amplifier
inputs with a single-conductor low capacitance sheilded
cable of 30 feet or
lessiniength. A two conductor
1/4-inch
plug will automatically unbalance the input. To help avoid
in
hum or buzz
fre
physically separated from power wiring er power
the output, be certain that
all
input cables
transformers.
4C. Output Connections
Binding posts are provided for speaker terminations, the
post
is
high (+)and
connector
is
the
black postislow (-).The
a high quality dual banana plug. See Figure 4
red
preferred
for typical output configurations.
Before making output connections, the input attenuators
so
should be turned off (full counterclockwise), doing
bl
eliminate any chance of loud
astscrdamage to the
will
loudspeaker.
of
all
of the
(in
the
the
Power loss in the speaker wire. The impedance
speakerconnecting wire would ideally be zero, so
amplifier output power would be delivered
the
load. However,
become a significant percentage
of
Thus, part
of
form
the amplifier poweris"lost"inthe wire
heat)
and
impedance of the speaker wire can
of
the speaker impedance.
the
power delivered to the speaker system
to
the speaker
slx
Page 9
IE1!1730o
STEREO
POWER
AMPLIFIER
Impedance
AWG
Size
10
12
14
16
18
20
22
Reslstance
(ohms/1000 feet)
1.00.
1.59
2.50
4.02
6.39
10.1
16.27
40
120
75
48
30
19
12
80
240
150
96
60
38
24
15
160
480
300
190
120
75
48
30
TABlE I - Cable Selection Chart
is
correspondingly reduced. Wire impedanceishigher when
using long wire runs and small wire sizes.
Table I shows the two-wire cable (copper) lengths
permissable
impedances, to avoid a loss of more than 0.5 dB.
of 1 dB (basically imperceptible) lengths may
For a 2-dB loss, the lengths wouldbemultiplied by 4.4.
In
general, note that the higher load impedances allow much
longer smaller-gauge wiring to be used,
40.
Grounding
The chassis
chassis grounds of additional audio equipment
ground of the amplifier may help reduce noise and hum.
4E.Ventilation
In
order to offset the heat generated bythe power amplifier,
itisnecessary to provide ample ventilation around the unit.
Avoid blocking or impeding the vent slots of thechassis.
Locate
dust or vibration to help prevent problems
caused
for
a number of wire sizes and speaker
For
be
of
the unit shouldbegrounded. Connecting the
to
the
the
unit where itisfree from direct sunlight, humidity,
wh
ich might be
by
the environment.
a loss
doubled. '
chassis
5. OPERATION
5A. Dual/Stereo Mode:
In the dual or stereo mode the channels may be operated
independently. Before hook-up
switch
isinthe dual position and that the level controls are
down
(FCCW).
Figures 3 and
increase level until the desired output power
lf either (clip) LED iltuminates, reduce the output with the
input attenuators or reduce the source signal
5B. Bridge Mode:
Input connection should
not make any input connections into channel
mode switch to bridge mode and make sure both level
controls
two red binding posts. Channel 1 red post
channel 2 red postislow (
are
Connect the inputs and outputs (See
4).
Turn the power amponand slowly
down
(FCCW).
.make sure that the mode
be
made into channel1 only.
two.
Connect the speaker ac
-).
00
not make a connection
is
obtained.
level.
Move the
ross
is
high
(+),
00
the
Operation
to
either of the black binding posts, Switch poweronand
slowly increase amplifier channel 1
desired output power
come
on,
reduce
signal level.
5C.APX Crossover Option:
The
APX
crossoverisa24dB per octave Linkwitz-Riley filter
network. There are
to 10,000 kHz,
is
obtained,Ifthe clip
the
power amp level control or the source
24
selectable frequencies from 50 Hz
***
CAUTION
No user serviceable parts inside. Hazardous voltage
currents
and
To
avoid electricshock, do
may be encountered
unless you are qualified to
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 Illists the primary wire color, the terminal
block
(TB),
and the position of theTBthe wire should be
located
To alter the transformer primary wiring configuration
following procedure:
1. Oisconnect the amplifier from the ac power source.
2.
3. Discharge each large capacitor carefully through a
4.Locate the two voltage-selection terminal blocks
5.
6. Select the desired operating voltage on Table
7. Relocate the fan wires according to the wiring chart.
8. Install the correct line fuse (values
9.Plug the amplifier into a variac and sweep the mains
10. Reinstall the top cover with the ten screws.
in
for operation at the desired voltage.
Remove the
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.
150-ohm, 2-watt resistor for
See Figure
mounted next to each other
between the power transformer and the large capacitor.
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.
reconnectthe wires accordingly. Push each wire firmly
into the block
voltage from
ing the amplifier's dc
should be
voltage.
ten
screws securing the top cover. There
6.
untilitsnaps into place.
zerotofull
±
78
operating voltage while monitor-
rail
V dc, ±5%at the selected primary
level control until the
LEO
***
within
not
perform
do
so.
on
voltages. The dc
any servicing
at
least one minute.
the side of the chassis
in
Table
indicators
the chassis.
use
the
11
and
111).
rail
voltage
Page 10
1"""17300
STEREO
POWER
AMPLIFIER
Permanent
(BLK) UNE
(BLK)
FUSE
(BLKIPWR
(BLK)
PWR
CAP
SW
SW
Connections·
TBl
TB2
o0
1 UNE
2 NEUTRAL (WH)
o0
200
V
TBI
TB2
o0
GAP
(BLK)
Factory Wlrlng (120 V)
TBI
TB2
o0
o0
220
V
TBI
T82
WH
WH/BLK
TBI TB2
•
•
100 V
240 V
TBI
5
7
8 BRNIWH
9
0
TB2
FAN
FAN
BRN
(YL)
(YL)
3
SCREWS
L
• Da
NOT
MOVE
THESE
WIRES,
THEYARE
Prlmary Power Converslon Chart for 100·, 120-, 200-, 220-, and 240-V, 50/60-Hz Operation
COMMONTaAll
TABLE
11
PRIMARY
3
SCREWS
VOLTAGES
lIne
VOltag8
100Vac
120
Vac
200
Vac
220
Vac
240Vac
Maln
Fuse
TABLE
Selection Guide
J
1N
__
w
Ill'DI__lMlo<Il.to
.......
__
\t
UPPER2SCREWS
FIGURE 5 - Top Cover Removal
Capacltor Discharglng
.~Itort.
FIGURE 6
Une
314
Normal·Blo
10
Al250
10
Al250
5
Al250
5
Al250
5
Al250
111
..
orlvlf
(
Fuse.
Serles
V
V
V
V
V
(
elght
Page 11
E
I
tl7300
STEREO
POWER
AMPLIFIER
Troubleshootlng
ISchematic
6. TROUBLESHOOTING
a.
Be
systematic; check one thingattime;
obvious.
b.
Verify that the input connections
See
Figure3,page
c.
Verify that the output connections
See
made.
d.
Check input and output cables for proper wiring.
e.
Check the signal source and theload.
Figure3,page
4.
are
properly made.
are
4.
the level controls are up.
f.
Check that the bridge mode switchisin
position.
g.Ifthere arenolights, check ac power switch and
fuse.
power
h.
Fuses
that blow instantlyon turn-on
internal distress, and you should
are
refer
a quallfied service station.
7. SCHEMATIC
check the
properly
Make
the
desired
a sign of
the
unit to
sure
6A. Protection
1I
the amplilier goes into "protect" mode itisprobably lor one
01
the following
reasons:
Very Low Impedance Load or Shorted Load. Disconnect
speaker lines Irom
If
to cool.
the protect
check the speakers or decrease the number
attached
De
to
on the Output of the Amplifier. Disconnect
lines from the power amplilier and allow the amplifier
If
the
protect
itisIikely
that a dc
the
power amplilier and allow
LEDs
go out after a short periodoftime
the
outputs.
LEDs
do not go out after a short periodoftime
vo~age
isonthe output and that
the
01
speakers
the
the
amplilier
speaker
to
amplifier
will need servicing.
the
cool.
(,
Al~
RfAB
INPUT
',""
'.
;",",
5.
OHE
OUTPUT
4.
3.
2.
1.
NOTES:
SECT10HOFlWO
CHANHEl.2OESIGNATORSIN(XXX).
BEGININ100
SERIES.
All
RESISTORSINOHMS.
REAR
INPUT
BOARD
AlL
CAPACITORSINMICROFARADSNOLT.
All
RESiSTORSINOHMS.
UNLESS
OTHERWISE
ONLY.
Sl«lWN.
V.W.
51lo-
Y1W,
5%.
SP€CIFIEO
89
'+----,;i;~-.~.:;.~:
-:
.c~
I
C".:4;'t:rJoQ.~
I.UItCb\...Clt:)
1tlOv
...
.t.CilI
WlllrtT....
&&C'\I<.l
1lol.Jo(lj
_n:/k&a.
M,(Iwll/.I1"'l'U.·
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Tlll-'I
tu·"
'.""
...
~"n
t.".
'.1-.
r.,.,
l1<f;.
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'.,.,~·
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flll·"f1Io1·.''''-411n'·.
nu·,
f1IIo,
,",z.JI01
e,·,,,·,,1
-,*"
C"l'J~
~
t'1/N
t"""
Tlll·"U..-
~t""
a,·",.""..r.,-
""-IIl'T#!l·.:ral
'.Z'-.
1S1-'
(H'l
fl.t<
'.1-
,.t
'N"
ur·
""7
""I"
'W'
AI~MAIN
POWER
BO
.Vr~~j
~o
':'_~\;~~
I
I
I
I
I
I
I
••
I
I
J
....
1_-
Page 12
fEil
7300
STEREO
POWER
AMPLIFIER
ServicelWarranty
8. SERVICE/WARRANTY INFORMATION
WARRANTY (Limited) -
Reinforcement Electronic Components
from
two years
duetodefectsinworkmanship and
tion
date of original purehase against malfunc-
malfunction occurs, unit
option) without charge for materials