Electro-Voice 7300A Operation manual

'^~J\ Sedrol6ice*
ty 7300A
® I STEREO POWER AMPLIFIER
OWNER'S OPERATION AND SERVICE MANUAL

Operating and Service Instructions for the Electro-Voice 7300A Power Amplifier
Table of Contents
1
2
3
4
5
7
ELECTRICAL .
1.1 120 V ac, 50/60 Hz Power Connections . .
1.2 220/240 V ac, 50/60 Hz Power Connections
INSTALLATION.
2.1 Rack Mounting.
2.2 Ventilation .
SIGNAL CONNECTIONS
3.1
O O
2
. 2
Q Q
. 2
0.0
Q A
. 2
0.4
. 2
0.4.i VM/a.iCllia.Xiing ITOWcr ijUoofcJo WiUii a uiiiii xjKjaxM.i:> ...
. 3
<3 n
. 3
0.0
o
3.5.1 Calculating the Maximum Length of Cable for a Specified Damping Factor . . .
. 4
, . 4
0.0
3.7
Compression Driver Protection Capacitors .
, . 5
OCTAL ACCESSORY SOCKETS
PROTECTION SYSTEMS.
5.1 Load Protection Circuitry ...
5.2 Amplifier Protection Circuitry...
5.3 Protect Indicator.
6
6
6
6
OPERATION ..
6.1 Dual Mode of Operation
6.2 Bridge Mode of Operation
IN CASE OF PROBLEMS . . .
8 SPECIFICATIONS
9
SERVICE INFORMATION ...
9.1 Trimpot Adjustments .
9.2 Equipment Needed .
9.3 Adjusting R39, the LF Cancel Trimpot.
9.4 Adjusting R26, the BIAS Trimpot ..
9.5 Adjusting R23 and R24, the Negative and Positive Current Limit Trimpots ......
9.6 Checking the Short Circuit Current.
9.7 Ordering Replacement Parts.. •
9.8 Factory Service. •
9.9 Technical Assistance.
13
13
13
13
13
14
15
15
15
15
i
Electro-Voice ® a Mark IV Company

Operating and Service Instructions for the Electro-Voice 7300A Power Amplifier
(BOTH SIDES)
1 ELECTRICAL
Two amplifier models are
available. One model hats a 50/60
Hz power transformer with two
120 V ac primary windings. These
windings may be wired in parallel
or series for operation at either
120 V ac or 220/240 V ac. The ot¬
her amplifier model is for export
into countries where the ac line
voltage is 100 volts, 50/60 Hz. The
next two sections refer to the first
model with the dual 120 V ac pri¬
mary windings.
1.1 120 V ac, 50/60 Hz
Power Connections
The amplifier is provided
with the primary of the power
transformer strapped for 120 V ac
operation from the factory. Refer
to Figure 2a for the wiring details.
WARNING! Verify that the power
transformer's primary circuit
configuration is correct for the
intended ac line voltage BEFORE
applying power to the amplifier.
1.2 220/240 V ac, 50/60 Hz
Power Connections
The power transformer
has two 120 volt primary windings
which can be connected in parallel
for 120 V ac line voltages, or in
series to meet 220/240 V ac re¬
quirements. Use the following
procedures to re-strap the primary
of the power transformer for
220/240 V ac applications.
1. Make sure the amplifier is
not connected to 2 iny pow¬
er source.
2. Remove and save the
eleven screws securing the
top cover. There are three
screws on each side and
three along the top-rear
edge of the chassis. In
addition, you must remove
the two inside screws al¬
ong the top edge of the
front panel. Refer to Fig¬
ure 1 for the exact screw
Figure 1 Top Cover Removal
locations.
3. Locate terminal blocks
TBl and TB2 located on
the side of the chassis
near the rear input PC
board. Reconnect the
leads as shown in Figure
2b.
4. Install the top cover with
the eleven screws previou¬
sly removed. Two screws
are longer than the others
removed from the sides
and rear. These longer
screws install into the
rearmost position on each
side of the chassis.
5. Install the 5A fuse,
Littelfuse Type SAB 5A
/250V slo-blo 326-series
ceramic body or equiv¬
alent.
2 INSTALLATION
2.1 Rack Mounting
The amplifier may be
installed in a standard 19 inch
equipment rack. It requires bVi
inches of vertical rack space and
secures to the rack cabinet with
the four rack mount screws and
cup washers provided in the hard¬
ware kit.
2.2 Ventilation
The amplifier must be
adequately ventilated to avoid
excessive temperature rise. It
should not be used in areas where
the ambient temperature exceeds
60 °C (140 °F). To determine the
ambient air temperature, operate
the system in the rack until the
temperature stabilizes. Measure
the ambient air with a bulb-type
thermometer held at the bottom
of the uppermost amplifier. Do
Electro-Voice ® a Mark W Company
1

Operating and Service Instructions for the Electro-Voice 7300A Power Amplifier
not let the thermometer touch the
metal chassis because the chassis
will be hotter than the ambient
air. If the air temperature exceeds
60 °C (140 °F), the equipment
should be spaced at least 1.75
inches apart or a blower installed
to provide sufficient air movement
within the cabinet.
WARNING: Do not operate the
amplifier within a completely
closed unventilated housing.
3 SIGNAL CONNECT¬
IONS
3.1 Input Connections
Balanced input connect¬
ions may be made to either the Vi"
phone (TRS) or the female XLR
connectors. For single-ended in¬
puts, strap the low (—) input to
ground (pin 3 on XLR or Ring on
Va" phone). Otherwise, the elect¬
ronically-balanced input stage will
see 6 dB less input signal level
than with a balanced input. Refer
to Figure 3 for typical input con¬
nections.
3.2 Line Output Connect¬
ions
The XLR and Vi" phone
connectors are wired in parallel.
Pin 2 of the XLR is the Tip of the
Vi" phone connector, and pin 3 is
the Ring. Since the input imped¬
ance of the electronically-balanced
input stage is high (15 kohms),
there is minimal loading on the
signal source. When the input
connections are made to one con¬
nector, the other may be used as
an auxiliary line output to feed
other high input impedance equip¬
ment. Refer to Figure 3 for possi¬
ble applications.
3.3 Output Connections
Output connections eire
made to the binding post connect¬
ors located on the rear. The Red
post is the high (-I-) output and
the Black post is the low (—) out¬
put. Refer to Figure 4 for typical
output connections.
3.4 Output Cable Selection
Speaker wire size plays an
important part in quality sound
systems. Small wire gauges can
waste power and reduce the damp¬
ing factor at the speaker termi¬
nals. This can add coloration and
muddiness to the sound. To help
offset this problem. Table I has
been assembled to enable you to
calculate the power losses in the
speaker cable.
3.4.1 Calculating Power
Losses with 8 ohm
Loads
To calculate the total
power loss in the speaker cable,
multiply the power loss per foot
(or meter) of the 2-wire cable
selected from Table I by the len¬
gth of the cable in feet (or met¬
ers). For example, suppose an in¬
staller uses 160 feet of 10 GA 2-
wire cable with an 8 O speaker
system. The total power loss in
the cable is:
Total Power Loss in cable
= 0.0509 watts/foot X 160 feet
= 8.1 watts
Does this mean that whenever the
amplifier produces 200 watts of
output power, 191.9 watts (200
watts minus 8.1 watts) will he
delivered to the 8 ohm load"? NO!
The actual load impedance is 8
ohms plus the resistance of the
cable (0.00204 ohms/foot times
160 feet) for a total load impe¬
dance of 8.3264 ohms. At the 8 G
rated output power, the output
voltage is 40 V rms. Therefore,
the amplifier produces 192.2 watts
with this load instead of 200
watts. This was calculated by
2
Electro-Voice ® a Mark IV Company

Operating and Service Instructions for the Electro-Voice 7300A Power Amplifier
This example illustrates the im¬
portance of using the proper wire
size.
3.4.2 Calculating Power
Losses with 4 ohm
Loads
To calculate the losses
when using a 4 ohm speaker sys¬
tem, multiply the loss at 8 ohms
by 3, In the above example, the 10
GA wire would consume 24.3
watts of power while the 18 GA
wire would waste 155.7 watts -
more than half of the amplifier's 4
ohm power rating.
3.5 Damping Factor
The higher the damping
factor rating of an amplifier, the
greater the ability of the amplifier
to control unwanted speaker cone
movements. When a signal drives
a woofer, current flowing through
the voice coil creates a magnetic
field. This field interacts with the
permanent magnetic field in the
gap and forces the combination
cone and voice coil assembly to
move outward. When the signal is
removed, the assembly moves in¬
ward but its momentum causes it
to overshoot its resting point. This
overshoot will dampen itself out
eventually but the unwanted mov¬
ements can add considerable dis¬
tortion products to the sound.
In the process of moving inward
through the magnetic field, the
voice coil assembly generates a
current of opposite polarity to the
original signal. This current
induces a voltage or “back EMF”
which travels through the speaker
wire to the eimplifier’s output.
The lower the amplifier’s output
impedance, the faster the over¬
shoot of the voice coil will dampen
out. The output impedance of an
amplifier can be calculated by
dividing the rated output impe¬
dance, typically 8 ohms, by the
damping factor. The 7300A has a
damping factor rating of 200
which corresponds to an output
Electro-Voice ® a Mark IV Company
3

Operating and Service Instructions for the Electro-Voice 7300A Power Amplifier
impedance of 0.04 ohms.
3.5.1 Calculating the Maxi¬
mum Length of Cable
for a Specified Damp¬
ing Factor Specifica¬
tion at the Load
The damping factor rating
is typically never realized at the
load because of the resistance of
the cable (and other factors such
as the contact resistance of an
output relay or the resistance of
an output fuse). The damping fac¬
tor at the load should be 30 for
general paging systems and 50 for
high fidelity music systems. Econ¬
omics usually dictate, however,
that these numbers are cut-in¬
half. The resulting damping factor
at the load should be based on
experience and customer satis¬
faction. Once a minimum damping
factor is determined for a parti¬
cular type of installation, the
following equation can calculate
the maximum length of 2-wire
cable which can be used to ach¬
ieve the minimum damping factor
specified at the load:
Max. Length of 2-wire cable in
feet
ZL — Zo
= _M _
DCR/ft
where
ZL is the load impedance
to connect to the
amplifier;
Zo is the amplifier’s
output impedance (0.04
ohms for the 7300A);
DF is the minimum
permissible damping
factor at the load; and
DCR/ft is the DC resis¬
tance of the 2-wire cable
per foot from Table I.
The same equation can be used to
calculate the maximum cable
length in meters by substituting
Table I 7300A Power Losses in 2-wire Speaker Cable
Power Cable Cross-
Power
AWG
DCR/ft
Loss/ft Sectional DCR/meter
LossAneter
(GA)
(a/ft)
(watts/ft)
area (mm^) (a/m)
(watts/m)
6 0.00081
0.0201
13.30 0.00264
0.0661
8
0.00121 0.0302
8.36
0.00421
0.1051
10 0.00204
0.0509 5.26 0.00669
0.1669
12 0.00324 0.0809 3.31 0.01063
0.2650
14
0.00515
0.1286 2.08 0.01691
0.4210
16 0.00819
0.2043
1.31 0.02685
0.6667
18 0.01302
0.3244
0.82 0.04289
1.0609
20
0.02070 0.5148
0.52 0.06764
1.6627
22
0.03292 0.8163 0.33 0.10658
2.5950
the DCR per meter value
from
/
1 Zo \
Table 1.
(Pout)(DCR/ft) \
DF ZL 1
Let’s use the equation. Suppose
ZL equals 8 ohms, Zo = 0.04
ohms, and the minimum damping
factor at the load is 25. In
addition, 18 GA cable is preferred.
Then, the maximum length of 18
GA cable which can be used to
achieve a damp-ing factor of 25 at
the load is:
8 — (0.04)
_25_ = 21.5 feet
0.01302 O/ft
Sometimes it may be necessary
to locate the speaker 100 feet or
more away from the amp-lifier.
In this situation, a much larger
gauge cable is required. How¬
ever, this may not be practical or
economical. The size of the 2-
wire cable can be greatly reduced
by stepping up the output volt¬
age of the amplifier to 70, 100,
140, or 210 volt, using an output
transformer, then stepping down
the voltage at the load. Such a
system is shown in Figure 5.
The maximum length of 2-wire
cable in this situation can be ap¬
proximated from the following
equation:
Max. Length of 2-wire cable
in feet
where
V is the stepped-up
voltage of the system;
Pout is the rated output
power of the amplifier;
Zo is the output
impedance of the amplifier
(0.04 ohms for the
7300A);
ZL is the load impedance;
DCR/ft is the DC
resistance of the 2-wire
cable per foot from Table
I; and
DF is the minimum
permissible damping
factor at the load.
Suppose a 210 volt system were
used at a 600 watt power level to
drive an 8 ohm load with a mini¬
mum damping factor of 25. Using
the same 18 GA cable as before,
the maximum length can now be
198 feet. Power companies use
this technique to trsinsfer large
amounts of power over great dis¬
tances.
3.6 Speaker Protection
Fuse Selection
Sometimes it may be de¬
sirable to use in-line fuses (fuses
in series with the output) to pro-
4
Electro-Voice ® a Mark TV Company

Operating and Service Instructions for the Electro-Voice 7300A Power Amplifier
Figure 6 High-voltage Distribution System
tect loudspeaker ^sterns (or the
amplifier). It is difficult, however,
to determine the proper fuse value
with the correct time lag and
overload characteristics to match
the limitations of a speaker sys¬
tem. The values shown in Table II
should serve only as a guide. To
use, determine the power rating
and load value. Then, select a
standard value fuse of the next
smaller value to the one listed in
the table.
Table II Calculated Output Fuse
Values
Power 4ft
8ft 16 ft
(watts) Load
Load Load
100 3.70
2.62 1.85
150
4.54 3.21
2.27
200
5.24 3.70
2.62
300
6.42 4.54 3.21
400
7.41 5.24
3.70
600
9.07 6.42
4.54
The values are calculated for fast-
blow fuses which carry 135% of
their current rating for an hour
but will blow within 1 second at
200%. Other fuse values may be
calculated for different power
levels from the following equation:
Fuse value =
(Pout X ZL) ^ amps
ZL X 1.35
where
Pout is the output power
rating of the amplifier;
and
ZL is the load impedance.
Use 32 volt fuses if possible; they
typically have the lowest internal
resistance which will help mini¬
mize deterioration of the damping
factor at the load. Refer to the
example in Figure 4.
3.7 Compression Driver
Protection Capacitors
Compression drivers, used
for mid to high frequency sound
reproduction, are much more sus¬
ceptible to damage from low freq¬
uencies than large cone loud¬
speakers. Even though an elect¬
ronic crossover may be employed,
problems may arise in the cables
between the crossover and the
power amplifier, or from mis-
adjustment of the crossover.
Either of these situations could
apply low frequency signals or
hum to the driver and cause
damage. To prevent a potential
mishap, Electro-Voice re¬
commends using a capacitor
between the amplifier and the
compression driver to suppress
low frequencies and possible DC.
Refer to the example in Figure 4.
In choosing a value, one must be
careful not to interfere with the
crossover frequency. As a general
rule, select a capacitor whose
break frequency, with respect to the
load, is 3 dB down at approximat¬
ely V 2 of the high pass comer fre¬
quency.
Mylar capacitors with at least a
100 volt ac rating are recom¬
mended. Table III shows the re¬
commended capacitor values for
use with 8 and 16 ohm drivers at
popular crossover frequencies.
Table III Compression Driver
Protection Capacitors
Crossover
8ft
16ft
Frequency Driver
Driver
500 Hz 80 ^iF 40 liF
800 Hz
50 |iF 25 liF
1000 Hz
40 ii? 20 ^lF
1250 Hz
33 jiF
16 nF
2000 Hz 20 |iF 10 ^iF
3150 Hz 12 ^F
6 |iF
4 OCTAL ACCESSORY
SOCKETS
Two octal sockets permit a
variety of plug-in accessories to be
used with the amplifier. Normally,
one “U” jumper is inserted be¬
tween octal socket pins 8 and 1,
and another between pins 7 and 6.
These jumpers must remain in
place for the amplifier to operate
when not using any accessory
modules. To use with an accessory
Electro-Voice © a Mark TV Company
5

Operating and Service Instructions for the Electro-Voice 7300A Power Amplifier
module, remove (and save) the
jumpers and install the module
making sure the key on its center
post aligns with the groove in the
female socket. For operation, refer
to the instructions provided with
the module. Schematically, the
module will be inserted between
the input connector and the bal¬
anced input stage.
Electronic modules are powered
from a bipolar 15 volt supply in
the amplifier. The supply is cap¬
able of supplying up to 25 ma DC
of current. Currents in excess of
25 ma DC may prevent the amp¬
lifier from disengaging from its
built-in protection mechanisms.
5 PROTECTION SYS¬
TEMS
5.1 Load Protection
Circuitry
Each channel independ¬
ently protects its load from start¬
up/shutdown transients, DC, and
large subsonic signals.
5.2 Amplifier Protection
Circuitry
A unique current-limiting
circuit waa designed specifically
for the amplifier. It features a
variable current limit which is a
function of the output signal volt¬
age. As a result, the amplifier can
deliver the rated currents into
rated loads but substantially lim¬
its the current into low impedance
or shorted loads (shorted output
terminals). Once the short is re¬
moved, however, the amplifier will
resume normal operation.
A dual speed fan is also incorp¬
orated to provide efficient cooling
under the most demanding condi¬
tions. When the heatsink temp¬
erature at the fin tips reaches
approximately 88 "C (190 °F), the
fan automatically switches to high
speed operation. As the temper¬
ature cools to approximately 78 °C
(172 °F), low speed operation is
once again resumed.
The heatsink is also thermally
equalized to prevent the output
devices nearest the fan from op¬
erating at a cooler temperature
than the devices at the opposite
end. This minimizes the thermal
gradient across the heatsink and
forces the devices to operate at
more nearly the same tempera¬
ture. This equalizes the lifetimes
and reliability characteristics of
the output devices so that no one
device becomes the weak link in
the chain.
Should the heatsink temperature
of a channel remain excessively
high, the affected channel will
shut down automatically. When
the output devices cool to a safe
operating temperature, the chan¬
nel will automatically resume
normal operation.
5.3 P rotect Indicator
The “PROTECT” LED
does not turn-on abruptly as
others may do; its intensity is
allowed to vary. As a result, its
degree of brightness serves as a
relative indicator of the severity of
the current operating conditions
e.g., the brighter the LED, the
greater the stress on the cha-
nnel(s). This provides a visual
notification well in advance of any
impending shutdown.
Although the channel may still
operate with the LED apparently
at full brightness, a total shut¬
down will occur within a few sec¬
onds unless the operating con¬
ditions improve. If a shutdown
does occur, the channel will re¬
sume normal operation as soon as
its devices have cooled to an
acceptable temperature.
6 OPERATION
6.1 Dual Mode of Oper¬
ation
In the dual mode of
operation, the channels may be
operated independently. After
installation and hookup, verify
that the mode switch, located on
the rear panel, is in the “DUAL”
position and rotate the level
controls fully counterclockwise
(full attenuation). Input a 0 dBu
(0.775 V rms) nominal signal level
and apply power. Slowly increase
the level controls until the desired
output power is obtained. If either
“CLIP” LED illuminates, reduce
the output with the channel level
control or reduce the input signal
level at its source.
WARNINGS Never attempt to con¬
nect the outputs of the two
channels in parallel.
6.2 Bridge Mode of Oper¬
ation
After installation and
hookup, verify that the mode
switch, located on the rear panel,
is in the “BRIDGE” position. Ro¬
tate both levels controls fully
counterclockwise (full atten¬
uation). Input a 0 dBu (0.775 V
rms) nominal signal level into
channel 1 only and apply power.
Slowly increase the level control
of channel 1 until the desired
output power is obtained. If either
“CLIP” LED illuminates, reduce
the output level with the level
control or reduce the input signal
level at its source.
CAUTIONS Be sure that no input
connections are made to channel 2
and that its level control is fully,
counterclockwise (OFF).
WARNINGS The bridged output
mode provides a true halanced-to-
ground output. Do not use any test
equipment to test or evaluate this
amplifier which does not have
floating grounds.
7 I n Case of Problems
Please check the following
items:
6
Electro-Voice ® a Mark IV Company

Operating and Service Instructions for the Electro-Voice 7300A Power Amplifier
1 .
2 .
Verify that the amplifier
is properly connected to
an ac power source and
that the source is active.
Verify that the input
connections are properly
made. Refer to Figure 3.
FAX: [phone]
Electro-Voice Customer
Service/Repair
8324 Doe Avenue
Visalia, CA 93219 U.S.A.
Tel: [phone]
FAX: [phone]
3. Verify that the output
connections are properly
made. Refer to Figure 4.
4. Check the input and
output cables for proper
wiring and continuity.
5. C heck the signal source
and the load.
6. Insure that the two jump¬
ers for each octal socket
are properly installed (if
not using optional plug-in
modules).
7. Insure that any accessory
modules installed do not
draw more than 25 ma
DC of current.
8. Check that the mode
switch is in the desired
position.
NOTICEj Repairs performed by
other than authorized warranty
stations (Dealers) or qualified
personnel shall void the warranty
period of this unit. To avoid loss
of warranty, see your nearest
Electro-Voice authorized dealer, or
call Electro-Voice Customer Ser¬
vice directly at [phone],
FAX [phone], or write:
Electro-Voice Customer
Service/Repair
10500 West Reno
Oklahoma City, OK 73128 U.S.A.
Electro-Voice Customer
Service/Repair
600 Cecil Street
Buchanan, MI 49107 U.S.A.
Tel: [phone]
Electro-Voice ® a Mark IV Company
7

operating and Service Instructions for the Electro-Voice 7300A Power Amplifier
8 SPECIFICATIONS Bridge mode, 8 or 16 O: 39 dB
Conditionss
1. 0 dBu = 0.775 volts rms.
2. Dual mode ratings are for each channel.
3. Both channels operating at rated output power
unless noted.
4. 120 volt ac line input voltage maintained for all
tests unless noted.
Continuous Rated Output Power:
(20 Hz - 20 kHz at less than 0.1% THD)
Dual mode, 4 D: 300 watts/ch
Bridge mode, 8 O; 600 watts
Dual mode, 8 D: 200 watts/ch
Bridge mode, 16 O; 400 watts
Input Sensitivity for Rated Output Power:
(Ref. 1 kHz, ±0.15 dB)
Dual mode, 4 Cl:
Bridge mode, 8 fl:
Dual mode, 8 fl:
Bridge mode, 16 fl:
Maximum Input Level:
(Ref. 1 kHz)
Input Impedance:
(Ref. 1 kHz)
Balanced:
Unbalanced:
+0.1 dBu (0.78 V rms)
+0.1 dBu (0.78 V rms)
+ 1.2 dBu (0.89 V rms)
+ 1.2 dBu (0.89 V rms)
+20 dBu (7.75 V rms)
15 kO
15kfl
Continuous Rated Output Power to Subwoofer:
(20 Hz - 1 kHz at less than 0.1% THD)
Dual mode, 4 0: 375 watts/ch
Bridge mode, 8 0: 750 watts
Dual mode, 8 O: 225 watts/ch
Bridge mode, 16 O: 450 watts
Polarity:
Positive-going signal
applied to pin 2 of XLR
or Tip of 1 / 4 " TRS jack
produces positive-going
signal at (+) output
terminal.
Maximum Midband Output Power:
(Ref. 1 kHz, 1% THD, @120 volts ac line voltage)
Dual mode, 4 O:
Bridge mode, 8 O:
Dual mode, 8 O:
Bridge mode, 16 O:
>400 watts/ch
>800 watts
>250 watts/ch
>500 watts
(Ref. 1 kHz, 1% THD, @108 volts ac (10% sag))
Dual mode, 4 fl: >325 watts/ch
Bridge mode, 8 fl: >650 watts
Dual mode, 8 fl: >200 watts/ch
Bridge mode, 16 fl; >400 watts
(Ref. 1 kHz, 1% THD, @100 volts ac (17% sag))
Dual mode, 4 O; >230 watts/ch
Bridge mode, 8 O: >460 watts
Dual mode, 8 fl: >175 watts/ch
Bridge mode, 16 fl: >350 watts
Headroom (Before clip): >1 dB
(Ref. 1 kHz, 1% THD, any mode)
Frequency Response; 10 Hz - 90 kHz
(Ref. 1 kHz, 1 watt output, +0/—3 dB)
Power Bandwidth: 20 Hz - 20 kHz
(Ref. 1 kHz, +0/—1 dBr where 0 dBr = rated output
power in any mode)
Voltage Gain:
(Ref. 1 kHz)
Dual mode, 4 fl or 8 fl: 33 dB
Phase Response;
(Any mode)
20 Hz: <+25°
20 kHz: >—15°
THD: <0.1% (lyp. <0.01%)
(Any mode, 30 kHz measurement bandwidth)
IMD (SMPTE 4:1): <0.05% (Typ. <0.01%)
(Any mode)
TIM (DIM 100); <0.05%
(Any mode)
Rise Time: <6 psec
(Any mode, 10% to 90%)
Slew Rate:
Dual mode, 4 or 8 D: >30 V/psec
Bridge mode, 8 or 16 fl: >60 V/psec
Damping Factor:
(Dual mode, 8 fl)
20 Hz - 1 kHz: >200
20 kHz: >75
Crosstalk: <75 dBr
(Ref. 1 kHz, 0 dBr = rated output power into 8
ohms, single channel operating)
Noise: >100 dB
(Below rated output power, A-weighting filter, 8 fl
8
Electro-Voice ® a Mark TV Company