Altec Lansing Anniversary Series Training manual

9444B and 9444B/SA
Anniversary Series Power Amplifier
Operating and Service Instructions
ALTEC LANSING® CORPORATION
II MARK IV compuuy
P. O. Box 26105 • Oklahoma City, OK « 73126-0105 USA ® Tel: [phone] • FAX; [phone]

operating and Service Instructions for the Altec leLnsing 9444B Power Amplifier
Table of Contents
1 EU^CTRICAL...
1.1 120 V ac> 50/00 TTz Power Goiiuections ... -... .
1.2 220/240 V ac, 50/60 Hs^ Power Connectioiis ....
2 INS TAl.lJ ^TTQN.. ......... - - -...
2.1 Eack Mounting -........
2.2 V&ntilatioii .....
3 SIGNAL CONNECTIONS ....- -- -
3.1 Input Conn^tiona......
3.2 Line Output Connections -.. - *. .....
3.3 Output Connections ......
3.4 Output Cable Selection.......
3.4.1 CaJeulating Power Losses with 8 ohm Loads......
3.4.2 Calculating Power Losses with 4 ohm Loads . . - . .... 6
3.5 Damping Factor ... ...................... ......
3.5.1 C alculating the Maxunum Length of Gable for a Specified Damping Factor ..............
3.6 Speaker Protection Fuse Selection ..- .. 4
3.7 Compression Driver Protection Capacitors ....
4 OCTAL ACCESSORY SOCKETS.. . ....- - □
5 PROTECTION SYSTEMS ......
5.1 Load Prot^tion Cireuitiy ....
5.2 Amplifier Protection Circuitry.....
5.3 Protect Indicator... . . . .....
6 OPERATION_______ ______
6.1 Dual Mode of Operation.........
6.2 Bridge Mode of Operation ....
7 IN CASE OF PROBLEMS ..........
8 SPECIFICATION....... .. S
9 SERVICE INFORMATION........
9.1 Trimpot Adjustments ....... ^2
9.2 Equipment Needed.-...... ... 12
9.3 Adjusting R39, the LF Cancel Trimpot ..... ’!
9.4 Adjusting R26, the BIAS Trimpot... . , . ....... i 2
9.5 Adjusting R23 and R24, the Negative and Positive Current Limit Trimpots.. i
9.6 Checking the Short Circuit Current ... ... ... i ^
9.7 Ordering Replacement Parts ........ 1 _
9.8 Factory Service .......
9.9 Technical Assistance ..........
10 THE 9444B/SA .........
i
ALTEC LANSING^ CORPORATION ® a IV Company

operating and Service Instructions for the Altec Lansing 9444B Power Amplifier
1 ELECTRICAL
Two amplifier models are
available* One model has a 50/60
Hz power transformer with two
120 V ac primal^ windings. These
windings may be wired in parallel
or series for operation at either
120 V ac or 220/240 V ao_ 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 windmgs,
1-1 120 V ac, 50/60 Hz
Power Coimectioiie
The amplifier is provided
with the primary of the power tra¬
nsformer 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, 60/60 Hz
Power Connections
The power transformer
has two 120 volt primary windings
which can be connected in parallel
for 120 V ac Hne voltages, or in
series to meet 220/240 V ac requi¬
rements- Use the following pro¬
cedures to re-strap the primary of
the power transformer for 220/240
V ac applications*
1* Make sure the amplifier is
not connected to any po¬
wer source,
2* Remove and save the ele¬
ven 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 innermost screws
inset into the top bumper
strip. Refer to Figure 1 for
the exact screw locations.
Figure 1 Top Cover Removal
3. Locate terminal blocks
TBl and TB2 on the side
of the chassis near the
rear input PC board. Re-
comueet the leads as
shown in Figure 2b.
4- Install the lop cover with
the eleven screws previ¬
ously removed. Two scr¬
ews are longer than the
others removed from the
sides and rear. These
longer screws install into
the rearmost position on
eacli side of the chassis.
5. Install an 5A fuse, Liiieb
fuse Type SAB 5A/2S0V
sio-blo 326-series ceramic
body or equiv.
2 INSTALLATION
2-1 Rack Mounting
The amplifier xniiy be in¬
stalled in a stand: - ! 19 inch
equipment rack. It ■ luires 5W
inches of vertical rac> r^-pace and
secures to the rack : binet with
the four rack moun^ screws and
cup washers provide-’’: the hard¬
ware kit.
2.2 Ventilation
The amplifier must be ad¬
equately ventilatfju avoid ex¬
cessive temperatur It should
not be used in area, where the
ambient tempersTurf exceeds 60
(140 ®F). To deteruiine the am¬
bient air temperat ure:-, operate the
^stem in the rack u\ U the temp¬
erature stabilize:;. Measure the
ambient air with a uulb-type ther¬
mometer held at tlie 'jotiom of the
uppermost amplifier. Do not let
the thermometer tm :h the metal
chassis because the c:iiasgis will be
hotter than the ambient air. If the
ALTEC LANSING^ CORPORATION • a Mark IV Company
1

Operating and Service Instructions for the Mtec Lansing 9444B Power Amplifier
Figure 2 Primary Wiring ConfiguratioB for 120 V ac and 220^40 V ac
air temperature exceeds 60
(140 the equipment sJhouId bo
spaced at least 1-75 inches apart
or a blower installed to provide
sufficient air mov^ent within
the cabinet.
WARNING: Do not operiite the
amplifier within a completely
closed unventilated housing,
3 SIGNAL CONNECT¬
IONS
3,1 Input CormectloBS
Balanced input connect¬
ions may be made to either the
barrier strip or the female XLR
connectors. For single-ended in¬
puts, strap the low (—) input to
ground (pin 3 on XLR), Other¬
wise, the electronically-balanced
input stage wib see 6 dB less in-
put signal level than with a bal¬
anced input- Refer to Figure 3 for
typical input connections.
3*2 Line Output Connect¬
ions
The XLR and barrier strip
connectors are wired in paraUeL
Pin 2 of the XLR is the (+) input
on the barrier strip, and pin 3 is
the (—) input. Since the input im¬
pedance of the electronically-
balanced input stage is high (15
kolims), there is min imal loading
on the signal source. When the
input connections are made to one
connector, the other may be used
as an auxiliaiy line output to
other high input impedance equip¬
ment, Refer to Figure 3 for poss¬
ible applications,
3^3 Output Connections
Output connections are
made to the four terminal barrier
strip connector located on the rear
of the unit. Refer to Figure 4 for
typical output connectionE,
3.4 Output Cable Selects.
Speaker wire si2:e playrs a-
important part in quality sot
systems. Small wire gauges ci i
waste power and reduce the dar -
ping factor at the speaker ter i-
inals. This can add coloration
muddio^s to the sound. To ii*-
offset this problem. Table I in
been assembled to enable yov,
calculate the power losses in
speaker cable,
3.4,1 Calculating Powe
Losses with 8
Loads
To calculate the tot
power loss in the speaker caij.
multiply the power loss per
Cor meter) of the 2-wire cal
selected from Table I by
length of the cable in feet
meters). For example, suppose
installer uses 160 feet of 10 GA
wire c^le with an 8 H
^stem. The total power loss
the cable is:
Total Power Loss in cable
- 0,0509 watWfoot x 160 feet
— 8,2 watts
Does this mean that whenever
amplifier produces 200 watt-
output power, 191,9 waits (2i
watts minus 8.1 watts) will Oi:
delivered to the 8 ohm load?
Tlie actual load impedance is
ohms plus the resistance of •
cable (0.00204 ohms/foot
160 feet) for a tot^ll load imp^
dance of 8,3264 ohms. At the 8
rated output power, the outpu
voltage is 40 V rms. Therefor
the amplifier produces 192,2 wax.;
with this load instead of 20f
watts. This was calculated
squaring the voltage and dividi; ,
by the load impedance {40^ div;
ed by 8.3264 ohms). As a resuii.
the actual power delivered to ‘
load is 184A watts (192,2 wa:
minus 8.1 watts).
2
ALTEC LANSING^ CORPORATION • a Mark IV Company

Operating and Service Instructions for the Altec Lansing 9444B Power Amplifier
SOURCE AMPLIFIER'S IKPUTS AUX OUTPUTS
Figure S laical Input Cannections
AMPLIFIER'S OUTPUTS LOUDSPEAKER LOADS
Figure 4 Typical Oatpui Connections
Had IS GA wire been used in the
above example, the loss in the
cable would have been 51*9 watts*
This example illustrate the im¬
portance of using the proper wire
size.
S.4.2 Calculating Power
Losses with 4 ohm
Loads
To calculait the losses
when using a 4 ohm spi^aker as¬
tern, multiply the at 3 ohms
by 3. In the above exair. i ! -, the 10
GA wire would com me 24*3
watts of power while 18 GA
wire wotild waste 15v 7 watts -
more than half of tke arrtplifier^s 4
ohm power raiin^^
3-5 Damping Factor
The higher tht diiinping
factor rating of an ajni liflerj the
greater the ability of ampliiier
to control unwanted s\ - iiker cone
movements. When a sigiml drives
a woofer, current flowii^ through
the voice coil creates Miagneiic
field. This Geld inter;-. with the
permanent magnetic in the
gap and forces the v'fnbmation
cone and voice coil ar ^enibiy to
move outward. When ' signal is
removed^ the asseinbl-. moves in¬
ward hut its momefitu ill causes it
to overshoot its resting licunt. This
overshoot will dampen itself out
eventually but the uir nted mo¬
vements can add consitiex^ble dis-
tori ion products to ih- ;’Ound*
In the process of moving inward
through the magni-' ic field, the
voice coil assembh^ aerates a
current of opposite poinrity to the
original signal. Tiiiti current
induces a voltage or “back EMF'*
which travels through the speaker
wire to the ampliiler*s output*
The lower the ampUni r k output
impedance, the faster the over¬
shoot of the voice coll will dampen
out. The output impetjanoe of an
amplifier can be calc ulated by
dividing the rated cputput impe¬
dance, typically S nhms, by the
damping factor. The has a
damping factor rating of 200
which correspond: ll* an output
impedance of 0.04 ohnis,
3.5-1 Calculating the
Maximo m Length of
Cable for n Specified
ALTEC LANSING^ COJ?PORAT/OiV • a AfarJt IV Company

Operating and Service InBtructions for the Altec Lansing 9444B Power Amplifier
Damping Factor Spec¬
ification at the Load
The damping factor rating
is typically never realiml at the
load because of the resistance of
the cable (and other factors such
as tlie 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 partic¬
ular type of installation, the fo-
ilowing equation can calculate the
maximum length of 2-wire cable
which can be used to achieve the
minimitm damping factor specified
at the load:
Max. Length of 2-wire cable in
feet
ZL — Zo
- JDF_
DCK/ft
where
ZL is the load impedance
to connect to the amp¬
lifier;
Zo is the amplifier's
output impedance (0,04
ohms for the 9444B);
DF is the minimum
permissible damping
factor at the load; aiwl
DCR/ft is the DC resis¬
tance of the 2-wb:e cable
per foot from Table L
The same equation can be used to
calculate the maximum cable leng¬
th in meters by substituting the
DCR per meter value from Table
L
Let's use the equation. Suppose
ZL equals 8 ohms, Zo = 0,04
ohms, and the minimum damping
Table I 9444B Power Losses in 2-wire Speaker Cable
Power
Cable Crni$a-
Power
AWO
DCB/n.
Losa/n Soclioinil DCR/Jiieter LDSs/rR.CtilJ
(GA)
(O/a)
(watWft)
Biva (mm^) (n/m)
0.00081
0.0201
13.30 0.00264 0.0661
8
0.00X21
omm
S.3ti 0.00421 0-1051
10
0.00204
0.0509 5.26 0.00669
0.1669
12
0.00324
0,0809
3.S1 001003 0.2650
14
0.00515
0.1280 3.08 0.01691
0-4210
16
0.00819
0.2043 1.31
0.02685
0.0067
18
0.01302
0.3244 0.82
0.042S9 1.0609
20
0.02070
0.5148
0.52 0.06764 1.0627
22
0.03292
0,8163
0.33 0 10658
2.5950
factor at the load is 25, in add¬
ition, 18 GA cable is preferred.
Then, the maximum length of 18
GA cable which can be used to
achieve a damping factor of 25 at
the load is;
8 — (G,04>
^5_ = 2L5feet
0.01302 n/ft
Sometimes it may be oec^sary to
locate the speaker 100 feet or
more away fiom the amplifier- In
this situation, a much larger
gauge cable is required. However,
this may not be practical or eco¬
nomical. The size of the 2-wire
cable can be greatly reduced by
stepping up the output voltage of
the amplifier to 70, 100, 140, or
210 volt, uaing an output trans¬
former, then stepping down the
voltage at the load. Such a system
is shown in Figure 5,
The maximum length of 2-wire ca¬
ble in this situation can be ap¬
proximated from the following
equation:
Max. Length of 2-wire cable in
feet
1 Zq
(Pout)(DCR/ft) DP ZL
where
V is the stepped-up
age of the fystem;
Pout is the mted outpi *
power of the amplifier:
Zo is the output imp
ance of the amplifier (O.C
ohms for the
ZL is the load impeda -
IKJR/ft is the DC
tance of the 2-wire cal:
per foot from Table I;
DF is the minimum p
missible damping facto:
the load.
Suppose a 210 volt system iver
used at a 600 watt power level
drive an 8 ohm load with a mi i
mum damping factor of 25, Usin^
the same 18 GA cable as befo^
the maximum Length can now
198 feet. Power companies Wr.
this technique to transfer larga
amounts of power over great di ^
tances.
3.6 Speaker Protectioj
Fuse Selection
Sometimes it may be des¬
irable to use in-line fuses (fuses ir
series with the output) to protect
loudspeaker ^sterns (or the am;
lifier). It is difficult, however,
determine the proper fuse value
with the correct time lag au:.
overload characteristics to match
the limitations of a speaker sys-
tern. The values shown in Table !!
should serve only as a guide, T:
4
ALTEC LANSING* CORPORATION • a Mark IV Company

Operating and Service Instructions for the Altec Lansing 9444B Power Amplifier
Figure 5 High-voltage Distrihution System
use, determine iJie power rating
and load value. Then, ^lect a
standard value fuse of the next
smaller value to the one listed in
the table.
Table n Calculated Output Fuse
VEdues
Power da
sn
jsa
(wtttta) Load Lead
100 5.70 2.62 1.85
150 4.54 5.2i 2.27
200
5.24 3.70 a.G2
300 6.42
4.34
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 doping
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 fre¬
quencies 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 misad-
jnstment of the crossover. Either
of these situations could apply low
frequency signals or hum to the
driver and cause damage. To pre¬
vent a potential mishap, Altec
Lansing recommends using a cap¬
acitor between the amplifier and
the compression driver lo supp¬
ress low frequencies and ^ Gssible
DC, Refer to the eKamp; ■ in Fig¬
ure 4.
In choosing a value, must be
careful not to interfer with the
crossover frequency. A* a jcneraZ
rule, sefeef a capac^:c^ whose
break frequency, with r^pect to the
load, is 3 dB down at appnxdmuie-
iy Vs of the high omer /ne-
quency.
Mylar capacitors witli least a
100 volt ac rating are ra: -umend-
ed. Table lU shows recom¬
mended capacitor val. - for use
with 8 and 16 ohm dri’ ^rs at pop¬
ular crossover frequencies.
Table HI Driver
Protection Capacitors
Crossov,!-
sa
ten
Fmiueniv
Drivor Drivner
SOO Hz m pT
40 (iF
800 Hz
50 pr 25 |iF
1000 Hz
40 jtF
20 t.F
1250 Hz
33 iiF
i6jiF
2000 Hz
20 pjT
10 i*F
3150 Hz 12 jlF
6m.F
6300 Hz
6 jii
3 |iF
4 OCTAL ACCESSORY
SOCKETf
Two octal sockets permit a
variety of plug-in acppr jori^ to be
used with the amplifier Normally,
one "U” jumper Is ^ -inerted bet¬
ween octal socket pins 8 and 1,
and another betwixt: * i ns 7 and 6.
These jumpers must remain in
plctee for the amplii rr to operate
when not using accessory
modules. To use with in accessory
module, remove r . save) the
jumpers and insb.r :he module
making sure the kev o its center
post aligns with tlis roove m the
female socket. For r ^ration, refer
to the instructions Tovided with
ALTEC LANSING^ CORPOitAT/OAT o a Mark IV Company
5

Operating and Service Instructions for the Altec Lansing 9444B Power Amplifier
the module. Schematically, the
module will bo inserted between
the input connector and the bal-
anced input stage.
Electronic modules are powered
from a bipolar 15 vplt supply in
the amplifier, 'Hie supply is cap¬
able of supplying up to 25 ma DC
of current. Currents in excess of
25 ma DC may prevent the ampli-
Ger from diseng^ing from its
built-in protection meciianisms.
5 PROTECTTON SYS¬
TEMS
5.1 Load Protection Cir¬
cuitry
Each channel independ¬
ently protects its Ic^d from
startup/shutdown transients, DC,
and large subsonic signals.
5.2 Amplifier Protection
Circuitry
A unique current-limiting
circuit was designed specifically
for the amplifier. It features a
variable ciirrenl limit which is a
function of the output signal volt¬
age, As a result, tlie amplifier can
deliver the rated currents into
rated loads but substantially lim¬
its the current into low impedance
or shorted loads (diorted 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 temper¬
ature at the fin tips reaches ap¬
proximately 88 ^ (190 TP')> the
fan automatically switch^ to high
speed operation. As the temper¬
ature cools to approximately 78 ®C
(172 "F), low speed operation is
once again reamed.
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. Tills minimizes the thermal
gradient across the heatsink and
forces the devices to operate at
more nearly the same tempera¬
ture, Tills equalizes the lifetimes
and reliability characteristics of
the output devices so that no one
device becomes the weak link in
the chain.
Should the hmtsiiik 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 ‘TROTECT” LED
does not tiirn*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 bri^ter the LED, the
greater the stress on the chan-
nel(sj. This provides a visual not¬
ification 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 unle^ the operating condit¬
ions improve. If a shutdown does
occur, the channel will resume
normal operation as soon as its
devices have cooled to an accept¬
able temperature.
0 OPERATION
6.1 Dual Mode of Oper¬
ation
In the dual mode of oper¬
ation, the channels may be oper¬
ated independently. After install-
ation 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 attom.
ion). Input a 0 dBo (0-775 V
nominal signal level and
power. Slowly increase the
controls until the desired oui
power is obtained. If ci
^^CLIP” LED illuminates, red
the output with the channel lev
control or reduce the input eigi
level at its source.
WARNING: Never attempt o
nect the outputs of the two cka
nels in parallel.
6,2 Bridge Mode of Op-
ation
After installatian
hookup, verify that the mt
switch, located on the rear pan?
is in the “BRIDGE’’ position, h
ate both levels controls fi .
counterclockwise (full atteiin;:
ion). Input a 0 dBu (0.775 V r:
noniinal signal level into chan:^
1 only and apply power. Slowly
crease the level control of char .
1 until the desired output povv
is obtained- If either “CLIP” LK
illuminates, reduce the output le
el with the level control or redur
the input signal level at its sou:
CAUTION: Be sure that no inp'
connectioTis are made to ehannc:
and that its level control is fut
counterclockwise (OFF).
WARNING: The bridged outp:
mode provides a true balanced-tf
ground output Do not use any tei
equipment to test or evaluate tk^
amplifier which does not ha’
floating grounds.
7 In Cajse of Problems
Please check the foUowii..
items:
1. Verify that the amplifier
is properly connected
an ac power source an^
that the source is active.
2, Verify that the input con¬
nections are proper.;
6
ALTEC LANSIN<?^ CORPORATION • a Mark IV Company

Operating and Service Instructions for the Altec Innsing 9444B Power Amplifier
made. Refer to Figure 3.
3. Verify that the output
connections are properly
made. Refer to Figure 4.
4. Check the input and out¬
put cables for proper
wiring and continuity,
5. Check 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
modnles installed do not
draw more than 25 ma
DC of current,
8. Check that the mode
switch is in the desired
position,
NOTICE: Repairs perfoT-med by
other than authorized^ worranty
stations (Declers) or qudlified
persofiTtel shall void the w<xrrajity
period of this unit To avoid loss
of warranty^ see your nearest Alt^
Lansing authorized dealer^ or call
Altec Lansing Customer Service
directly at (405) 324^5311^ FAX
[phone], or uirite:
Altec Lansing Customer
Service/Repair
10500 W, Reno
Oklahoma City, OK 73128
U,ISA,
ALTEC LANSING^ CORPORATION « a Mark IV Company
7

operating and Service Instructions for the Altec Uinsing 9444B Power Amplifier
8 SPECIFICATIONS
Bridge mode, 8 or 16 Q; 39 dB
Conditions:
1. 0 dBu - 0<775 volts rms.
2. Dual mode ratings are for each charmeL
3. Both channels operating at rated output power
unless noted.
4. 120 volt ac line input voltage maintained for all
tests unless noted.
Continuous; Elated Output Power:
(20 Hz - 20 kHz at less than 0-1% THD)
Dual mode, 4 fl: 300 watts/ch
Bridge mode, 8 A: 600 watts
Dual mode, 8 A: 200 watts/ch
Bridge mode, 16 A: 400 watts
Input Sensitivity for Rat«d Output Power;
(Ret 1 kHz, ±0.15 dB)
Dual mode, 4 A: ±0.1 dBu (0.78 V nn >
Bridge mode, 8 A: +0.1 dBu (0.78 V rm:v
Dual mode, 8 A: +1.2 dBu (0.89 V rm."
Bridge mode, 16 A: +1.2 dBu (0.89 V rm
Maximum Input Level: +20 dBu (7.75 V rme
(Ref, 1 kHz)
input Impedance:
(Ref. 1 kHz)
Balanced; 15 kA
Unbalanced: 15 kA
Continuous Rated Output Power to Subwoofer:
(20 Hz - 1 kHz at less than 0.1% THD)
Dual mode, 4 A: 375 watts/ch
Bridge mode, 8 A: 750 watts
Dual mode, 8 A: 225 watts/ch
Bridge mode, 16 A; 450 watts
Polarity:
Positive-going sign
applied to pin 2 of
or {+) of barrier st.
produces positive-gf
signal at (+) oirt-p
terminal.
Maximum Midband Output Power:
(Ref. 1 kHz, 1% THD, @120 volts ac line volUge)
Dual mode, 4 A: >400 watts/ch
Bridge mode, 8 A: >800 watts
Dual mode, 8 A: >250 watts/ch
Bridge mode, 16 A: > 500 watts
(Ref. 1 kHz, 1% THD, @108 volts ac (10% sag))
Dual mode, 4 A: >325 watts/ch
Bridge mode, S A: >650 watts
Dual mode, 8 A: >200 watts/ch
Bridge mode, 16 A; >400 waits
(Ref 1 kHz, 1% THD, @100 volts ac (17% sag))
Dual mode, 4 A: >230 watts/ch
Bridge mode, 8 A: >460 watts
Dual mode, 8 A: > 176 watts/ch
Bridge mode, 16 A; >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 A or 8 0; 33 dB
<+ 2 5 ^
>-^ 15 "
< 0 . 1 % {Typ. < 0 . 01 %
measurement bandwidth)
Phase Response:
(Any mode)
20 Hz:
20 kHz:
THD:
(Any mode, 30 kHz
IMD (SMPTE 4:1):
(Any mode)
TIM (DIM 100):
(Any mode)
Rise Time:
(Any mode, 10% to 90%)
Slew Rate:
Dual mode, 4 or 8 A:
Bridge mode, 8 or 16 A:
Damping Factor;
(Dual mode, 8 A)
20 Hz - 1 kHz:
20 kHz:
<0.05% (l^p. <0S)m
<0.05%
<6 psec
>30 V/psac
>60 V/psec
>200
>76
Crosstalki <76 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, S
8
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