Altec Lansing 4200A, 6125A User Manual
6125A
4200A
Multi-channel power amplifiers
Altec Lansing PrAltec Lansing Pr
Altec Lansing Pr
Altec Lansing PrAltec Lansing Pr
1000 W. Wilshire Blvd. Suite 362
Oklahoma City, OK 73116 USA
A division of Altec Lansing Technologies Inc, Milford PA 18337-0277 Made In USA
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Operating Manual 6125A and 4200A Multi-Channel Power Amplifier
Table Of Contents
1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 UNPACKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 AC POWER REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1 Voltage Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.2 Current Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.3 AC Grounding & Earth Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 CABLE REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.1 Input Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.2 Output Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5 RACK-MOUNTING REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5.1 Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5.2 Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5.3 Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
6 FRONT PANEL FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
7 REAR PANEL FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.1 Input Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.2 Input Ground Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.3 Multi-Channel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.4 50Hz Low Cut Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7.5 Input Level Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7.6 Stereo/Mono Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
7.7 Dual Channel Mode/Bridge Mode Switches . . . . . . . . . . . . . . . . . . . . . . 8
7.8 Loudspeaker Output Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7.9 AC Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
8 SELF-PROTECTION FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
8.1 Power Supply Undervoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8.2 Power Supply Overvoltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8.3 Output Overcurrent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8.4 Heat Sink Overtemperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8.5 Unacceptable DC or High Frequency Output Content . . . . . . . . . . . . 10
8.6 AC Power Interruption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
9 TYPICAL APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
9.1 Six Channel Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
9.2 Dual Mono Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
9.3 Bridged Mono Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
9.4 Typical PA Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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Operating Manual 6125A and 4200A Multi-Channel Power Amplifier
10 DESIGN THEORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
11 TROUBLESHOOTING TIPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
11.1 No Audio Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
11.2 Distorted Sound . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
11.3 Hum or Buzz Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
12 DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
13 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
14 WARRANTY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Caution: Caution:
Caution:
Caution: Caution:
This power amplifier can prThis power amplifier can pr
This power amplifier can pr
This power amplifier can prThis power amplifier can pr
power levels, and high sound prpower levels, and high sound pr
power levels, and high sound pr
power levels, and high sound prpower levels, and high sound pr
mize the risk of injurymize the risk of injury
mize the risk of injury
mize the risk of injurymize the risk of injury
manual beformanual befor
manual befor
manual beformanual befor
e connecting to a sound system.e connecting to a sound system.
e connecting to a sound system.
e connecting to a sound system.e connecting to a sound system.
, damage, or hearing loss, please r, damage, or hearing loss, please r
, damage, or hearing loss, please r
, damage, or hearing loss, please r, damage, or hearing loss, please r
oduce dangeroduce danger
oduce danger
oduce dangeroduce danger
essuressur
essur
essuressur
e levels in loudspeakers. In ore levels in loudspeakers. In or
e levels in loudspeakers. In or
e levels in loudspeakers. In ore levels in loudspeakers. In or
ous output voltage levels, highous output voltage levels, high
ous output voltage levels, high
ous output voltage levels, highous output voltage levels, high
der to mini-der to mini-
der to mini-
der to mini-der to mini-
ead the entiread the entir
ead the entir
ead the entiread the entir
e owner’e owner’
e owner’
e owner’e owner’
CAUTION
RISK O F ELECTR I C SH OCK
DO NOT OPEN
The lightning flash with arrowhead symbol,
within an equalateral triangle, is intended to alert
the user to the presence of uninsulated "dangerous voltage" within the product's enclosure that
may be of sufficient magnitude to constitute a risk
of electric shock to persons.
TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER. NO USER SER-TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER. NO USER SER-
TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER. NO USER SER-
TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER. NO USER SER-TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER. NO USER SER-
VICEABLE PVICEABLE P
VICEABLE P
VICEABLE PVICEABLE P
TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THISTO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS
TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS
TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THISTO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS
ARAR
TS INSIDE. REFER SERTS INSIDE. REFER SER
AR
TS INSIDE. REFER SER
ARAR
TS INSIDE. REFER SERTS INSIDE. REFER SER
APPLIANCE TO RAIN OR MOISTURE.APPLIANCE TO RAIN OR MOISTURE.
APPLIANCE TO RAIN OR MOISTURE.
APPLIANCE TO RAIN OR MOISTURE.APPLIANCE TO RAIN OR MOISTURE.
VICING TO QUALIFIED SERVICING TO QUALIFIED SER
VICING TO QUALIFIED SER
VICING TO QUALIFIED SERVICING TO QUALIFIED SER
equalateral triangle is intended to alert the user
to the presence of important operating and maintenance instructions in the literature accompany-
ing the device.
The exclamation point within an
VICE PERSONNEL.VICE PERSONNEL.
VICE PERSONNEL.
VICE PERSONNEL.VICE PERSONNEL.
ss
s
ss
TO REDUCE THE RISK OF FIRE, REPLACE ONLTO REDUCE THE RISK OF FIRE, REPLACE ONL
TO REDUCE THE RISK OF FIRE, REPLACE ONL
TO REDUCE THE RISK OF FIRE, REPLACE ONLTO REDUCE THE RISK OF FIRE, REPLACE ONL
REFER REPLACEMENT TO QUALIFIED SERREFER REPLACEMENT TO QUALIFIED SER
REFER REPLACEMENT TO QUALIFIED SER
REFER REPLACEMENT TO QUALIFIED SERREFER REPLACEMENT TO QUALIFIED SER
WW
ARNING: THIS APPARNING: THIS APP
W
ARNING: THIS APP
WW
ARNING: THIS APPARNING: THIS APP
ARAARA
TUS MUST BE EARTUS MUST BE EAR
ARA
TUS MUST BE EAR
ARAARA
TUS MUST BE EARTUS MUST BE EAR
POWER LINE CORDPOWER LINE CORD
POWER LINE CORD
POWER LINE CORDPOWER LINE CORD
Y WITH SAME TYPE FUSE.Y WITH SAME TYPE FUSE.
Y WITH SAME TYPE FUSE.
Y WITH SAME TYPE FUSE.Y WITH SAME TYPE FUSE.
VICE PERSONNEL.VICE PERSONNEL.
VICE PERSONNEL.
VICE PERSONNEL.VICE PERSONNEL.
THED THROUGH THE SUPPLIEDTHED THROUGH THE SUPPLIED
THED THROUGH THE SUPPLIED
THED THROUGH THE SUPPLIEDTHED THROUGH THE SUPPLIED
3
Operating Manual 6125A and 4200A Multi-Channel Power Amplifier
1. INTRODUCTION
The 6125A and 4200A power amplifiers combine
the efficiency of a MOSFET high-speed switching output
stage with the sophistication of modern microprocessor and
DSP technology to produce a multi-channel amplifier with
unprecedented versatility and power in a single 3RU pac kage.
Although similar to other amplifiers with class D
output stages, the 6125A and 4200A amplifiers employ
internal microprocessor and DSP algorithms to optimize
output switching characteristics and eliminate the usual
harshness associated with high-frequency audio in standard class D amplifiers. This optimization results in a
spread-spectrum switched output that varies with input
amplitude and frequency , and minimizes radiated emissions
by eliminating the single-frequency high-energy radiated
interference normally associated with switching outputs.
The use of a simple linear power supply removes another
potential source of radio-frequency interference, an important consideration as racks become more and more
heavily populated with digital signal processing equipment.
A small switching supply using flyback topology provides
an efficient power source for logic, protection, pre-amplifier and indicator circuits.
To assure reliable operation, the usual protection
from excessive high-frequency, DC offset, and thermal
overload is supplemented by power supply undervoltage,
power supply overvoltage, and output overcurrent detection, all monitored and controlled by the latest in miniaturized microprocessor technology.
In sum, 6125A and 4200A amplifiers combine the
best of the new digital technologies with the best of the
traditional analog technologies to provide a product that
will supply clean sound at full output from every channel
while generating minimal heat, thus increasing the reliability of every other piece of equipment in a rack as well
as preserving its own.
2. UNPACKING
As a part of our system of quality control, every
Altec Lansing product is carefully inspected before leaving the factory to ensure flawless appearance. After unpacking, please inspect for any physical damage. Save
the shipping carton and all packing materials, as they were
carefully designed to reduce to minimum the possibility
of transportation damage should the unit again require
packing and shipping. In the event that damage has occurred, immediately notify your dealer so that a written
claim to cover the damages can be initiated.
The right to any claim against a public carrier can
be forfeited if the carrier is not notified promptly and if
the shipping carton and packing materials are not available for inspection by the carrier. Save all packing materials until the claim has been settled.
3. AC POWER REQUIREMENTS
3.1 Voltage Requirements
The 6125A and 4200A amplifiers can be operated
from nominal 120VAC or 240VAC, 50/60Hz mains. This
is user-configurable by changing the insert in the AC Inlet
(See section 7.9). The power connector on the amplifier
accepts a standard IEC-320 receptacle.
For nominal 120VAC operation, the power cord
should be three-conductor, rated for at least 13A (16AWG).
The line fuse should be type MDA, 12A.
For nominal 240VAC operation, the power cord
should be three-conductor, rated for at least 10A (18AWG).
The line fuse should be type MDA, 10A.
3.2 Current Requirements
1.) Idle (no audio):
6125A 4200A
120V: 0.81A 120V: 0.9A
240V: 0.42A 240V: 0.5A
2.) With typical audio inputs:
8Ω loads on all channels
120V: 4A 120V: 4.6A
240V: 2A 240V: 2.3A
4Ω loads on all channels
120V: 6.5A 120V: 7.0A
240V: 3.3A 240V: 3.5A
6125A and 4200A amplifiers consume less than
12 amps when all channels operate at 1/8 power into rated
(4 ohm) loads. This condition satisfies the UL, CSA and
building electrical code requirements for a piece of audio
equipment not to consume more than 80% of the current
available when plugged into a grounded 15 amp outlet and
operated at 1/8 of maximum power.
3.3 AC Grounding and Earth Grounding
T o reduce the risk of g round loop hum, all system
ground references should originate at the same point in
your A C po wer distribution. Do not remo ve the amplifier’s
ground pin, as it creates a potential shock hazard.
4
Operating Manual 6125A and 4200A Multi-Channel Power Amplifier
4. CABLE REQUIREMENTS
4.1 Input Cables
Be sure to use shielded cable whether balanced or
unbalanced. Shielding which is properly grounded will
protect the signal from outside electrical interference such
as RF, fluorescent lighting, and computer/display emissions. As a general rule, unbalanced or single-ended (tipsleeve) lines of less than 10 feet are satisfactory, but greater
distances or noisy field environments require a balanced
signal. Avoid running input lines in close proximity or
parallel to long speaker lines, AC power cables, or power
transformers, as this may generate hum or oscillation.
4.2 Output Cables
These amplifiers are capable of delivering high
levels of output current, therefore the wire gauge used for
speaker cables is particularly important. Inadequate wire
gauge can add significant resistance to the speaker’s own
impedance, especially over long distances, reducing the
power which is actually delivered to the speaker. It could
also result in a decreased damping factor and possible fire
hazard. Since power at the speaker load is of primary concern in system design, we have included a table to best
determine appropriate wire gauge for your application. The
following table lists the resistance per 100 feet of common copper wire gauges, and also gives the percentage of
the speaker load power which would be lost in an arbitrary
100 ft run of different gauges of 2-conductor copper
speaker wire.
5. RACK-MOUNTING REQUIREMENTS
5.1 Mechanical
The 6125A and 4200A amplifiers are designed to
fit in standard 19-inch equipment racks. The front panel
rack-mount ears are sufficiently strong for most applications, however if you desire further integrity for mobile
racks, we recommend using the four additional holes in
the back of the chassis for supplemental rear-mounting (see
dimensional drawing for details).
5.2 Cooling
Be certain that both the front and back of the rack
have unhindered access to free air flow. Fan direction is
from front to back. It is not necessary to leave empty space
above or below.
5.3 Grounding
In some installations where the sound system is
sensitive to RF noise or system-induced oscillation, it may
be necessary to ground the amplifier’s chassis to the rack
enclosure. This is accomplished using star type
lockwashers on the four rack mounting screws. These star
washers will penetrate through the amplifier’s paint to adequately ground the chassis to the rack.
Wire Gauge Ω/100ft 8Ω load 4Ω load
#8 .0605Ω 0.8% 1.5%
#10 .1018Ω 1.3% 2.5%
#12 .1619Ω 2.0% 4.0%
#14 .2575Ω 3.2% 6.4%
#16 .4094Ω 5.1% 10.2%
#18 .6510Ω 8.1% 16.3%
Table 4.1: Wire gauge resistance/power loss
This table expresses the power loss as a percent-
age of the load’s po wer rather than the total amplifier output power in order to accurately determine power loss at
other cable lengths. For example, if you plan to deliver
150 watts to an 8Ω load through 50 ft of 14 ga. cable, the
power loss in the cable would be half that of a 100 ft run
of #14 wire as shown in the table, or 1.6% of 150W, which
is an insignificant 2.4 watts. However, if you were to run
200 ft of 18 ga. cable to a 4Ω load, the loss would be twice
that of the 100 ft run shown in the table, or 32.6% of 250W,
which is 81.5 watts lost as heat. Always be sure to use
adequate gauge speaker wire.
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