Peavey ST, LT User Manual
LT/ST Power Amplifier
Owner’s Manual
1
Save the carton and packing materials!
Should you ever need to ship the unit,
use only the original factory packing.
For replacement packaging, call Crest Audio’s
Customer Service Depar tment directly.
2
Read all documentation before
operating your equipment.
Retain all
documentation for future reference.
3
Follow all instructions printed on
unit chassis for proper operation.
4
Never hold a power switch or circuit breaker in the on-position, if
it won’t stay there by itself!
5
Do not use the unit if the electrical
power cord is frayed or broken.
The power supply cords should be
routed so that they are not likely to be
walked on or pinched by items placed
upon or against them.
6
Always operate the unit with the
AC ground wire connected to the
electrical system ground.
Precautions
should be taken so that the means of
grounding of a piece of equipment is not
defeated.
7
Damage caused by connection to
improper AC voltage is not covered
by any warranty.
Mains voltage must be
correct and the same as that printed on
the rear of the unit.
8
Do not ground any hot (red) terminal.
Never connect a hot
(red) output to
ground or to another hot (red) output!
9
Power down and disconnect units
from mains voltage before making
connections.
0
Do not drive the inputs with a signal level greater than that
required to enable equipment to
reach full output.
¡
Do not run the output of any amplifier channel back into another
channel’s input.
Do not parallel- or series-connect
an amplifier output with any
other amplifier output.
Crest Audio is not responsible for damage
to loudspeakers for any reason.
Ô
Do not connect the inputs or outputs of amplifiers to any other
voltage source:
such as a battery,
mains source, or power supply, regardless of whether the amplifier is turned
on or off.
£
Connecting amplifier outputs to
oscilloscopes or other test equipment while the amplifier is in bridged
mono mode may damage both the
amplifier and test equipment!
¢
Do not spill water or other liquids
into or on the unit, or operate the
unit while standing in liquid.
ˆ
Do not block fan intake or
exhaust ports.
Do not operate equipment on a
surface or in an environment
which may impede the normal
flow of air around the unit:
such as
a bed, rug, weathersheet, carpet, or
completely enclosed rack.
§
If the unit is used in an extremely
dusty or smoky environment:
the
unit should be periodically blown free of
foreign matter.
¶
Do not use the unit near stoves,
heat registers, radiators, or other
heat producing devices.
ƒ
The power cord of equipment
should be unplugged from the outlet when left unused for a long period of time.
Service Information
Do not remove the cover!
Removing the cover will expose you to
potentially dangerous voltages.There are
no user serviceable par ts inside.
Equipment should be serviced by
qualified service personnel when:
A. The power supply cord or the plug has
been damaged.
B. The equipment has been exposed to rain.
C. The equipment does not appear to oper-
ate normally, or exhibits a marked change in
performance.
D. The equipment has been dropped, or the
enclosure damaged.
To obtain service:
contact your nearest Crest Audio
Service Center, Distributor, Dealer,
or Crest Audio at 201.909.8700
USA
or visit www.crestaudio.com for additional information.
email techserve
@crestaudio.com
This equipment conforms to EN55022 Class A. In a
domestic environment this product may cause radio
interference in which case the user may be required to
take adequate measures.
This equipment has been tested and found to comply
with the limits for a Class B digital device pursuant to
part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential installation.This equipment generates, uses and can radiate radio frequency energy and, if
not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment
does cause harmful interference to radio or television
reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to
correct the interference by one or more of the following
measures:
*Reorient or relocate the receiving antenna.
*Increase the separation between the equipment and
the receiver.
*Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
*Consult the dealer or an experienced radio/TV techni-
cian for help.
This symbol is used to alert
the operator to follow important
procedures and precautions
detailed in documentation.
This symbol is used to warn operators
that uninsulated “dangerous voltages”
are present within the equipment enclosure that may pose a risk of electric
shock.
important precautions
p. 1
table of contents
1
2
3
4
5
6
7
how to use this manual
p.2
introduction
p.3
installation
p.5
unpacking
mounting
cooling and ventilation
powering
maintenance
features overview
p.9
front panel
rear panel
operation modes
p.15
stereo
parallel
bridged
connections
p.17
input
output
safety
p.21
tourclass protection
precautions
user responsibility
service and support
p.25
support
contact us
registration
specifications
p.27
block diagram
p.28
wire gauge charts
p.29
b
c
a
contents
appendices
p. 2
LT / ST owner’s manual
how to use this manual
1
conventions
terms
official Crest Audio features and
each indicator or control on the amplifier will appear as: terms
actions
specific actions or selections the user can execute will appear as: actions
tasks
are broken down into steps 1
2
3
warnings
indicators
tips
see
see—refers to other sections of the manual containing
supplementary information on the current topic or a related issue
note
note—supplementary feature information
Preferred methods.
Helpful hints.
Feature insights.
+
Procedures not to attempt.
Issues or hazards to keep in
mind when operating
the equipment.
a
What to look for on
the equipment display.
Alerts, indicators, or
prompts that may appear.
®
p. 3
introduction
1
welcome
Congratulations on your purchase of a new LT / ST Series professional power amplifier and thank you for your confidence in Crest Audio products. You are among the growing number of audio professionals who have made Crest
Audio one of the world’s leading suppliers of professional and commercial/industrial audio systems.
For your safety, please read the Important Precautions section before installing and operating the amplifier. The Crest
Audio LT and ST Series amplifiers are designed for high operating efficiency and accurate sonic performance across
the full audio bandwidth, even under stressful conditions.
The Crest Audio LT and ST series both utilize Class D amplifier technology which greatly improves the efficiency of
the amplifier and reduces the power demand from the mains supply. The LT amplifier incorporates a linear power
supply whereas the ST uses a resonant switching supply with power delivery characteristics similar to a linear supply but with greatly reduced weight. Both power supply designs are built to the same uncompromising standards.
This, combined with major advances in amplifier technology provides for extreme reliability and sonic accuracy for
which Crest products are renown.
The Crest audio LT series and ST series amplifiers differ in power supply design,electrical efficiency and weight however, their feature sets are identical.For this reason, the majority of this users manual applies to both models.
LT linear-toroid power supply
A traditional linear power supply is used in the LT Series. Because of the amplifier sections efficiency, (approx
93%) the transformer does not need to be as big or as heavy.This gives the LT Series an advantage in delivering more power in a more compact package.
The efficiency of the output stage also gives the power supply the ability to handle heavy-duty cycles without
compromising sonic integrity.
ST resonant-switching power supply
The ST amplifier switching power supply employs a resonant design which utilizes zero-power switching
technology.
Benefits of resonant-switching include:
• reduced power component stress for
better reliability and efficiency
• 20dB lower noise than conventional switching supplies
(and therefore more EMC friendly)
• behaves like a classic linear supply, but with the added
advantages of size and weight reduction
In order to maintain strict quality assurance standards, all Crest Audio power amplifiers are built in our state-of-theart USA manufacturing facility. Internal components are the finest available and key sub-assemblies are pre-tested
before final assembly. Each amplifier is “burned in” and thoroughly tested (using precision audio test equipment)
before shipping. In addition, all LT / ST Series amplifiers incorporate Crest’s exclusive TourClass
®
protection features
to safeguard both internal circuitry and connected loudspeakers.
This proven combination of advanced design,quality construction and comprehensive circuit protection is your guarantee of fail-safe reliability. You can depend on consistent, stable performance even when your LT / ST Series amplifier is subjected to punishing extremes in the most demanding fixed or mobile sound reinforcement applications.
p. 5
installation
2
unpacking
mounting
cooling and
ventilation
powering
maintenance
/
what to do with the shipping carton
/
proper rack-mounting technique
/
keeping the amplifier cooled
/
required AC line voltages
/
routine maintenance practices
LT / ST owner’s manual
p. 6
installation
2
unpacking
Please inspect the amplifier carefully immediately after unpacking. If you find any damage, notify your supplier/dealer immediately. Only the shipper may file a damage claim
with the carrier for damage incurred during shipping. Be sure to save the carton and
all packing materials for the carrier’s inspection.
If the packing materials are in good condition, please save them.
If you ever need to ship the unit anywhere without mounting it in a rack, you should
take advantage of the original factory packing materials in order to avoid unnecessary
damage.
mounting
All LT / ST Series amplifiers mount in standard 19-inch racks and occupy two rack
spaces. Four front-panel mounting holes are provided on each amplifier. Rear mounting ears give additional support and use of rear supports is highly recommended in all
mobile and touring sound systems. Handles are fitted standard.
front width 19"/483mm
LT shown. ST has the same dimensions
For replacement
packaging, call Crest
Audio’s
Customer Service
Department directly.
see—service and support
+
LT / ST shown
rear width 17"/432mm
front
height
3.47"/
88 mm
front
height
3.47"/
88mm
depth14"/356mm
2
p. 7
installation
Make certain that there
is enough space around
the front and rear of the
amplifier to allow the
heated air to escape.
When mounting in a rack,
try to avoid using doors
or covers on the front
and rear of the enclosure;
the exhaust air must not
be impeded
suggestion
In racks with closed backs
allow at least
one stan-
dard-rack-space opening
for every four amps.
a
cooling and ventilation
LT / ST amplifiers use a forced air cooling system to maintain a low,even operating temperature.
Air is drawn in by a DC fan on the rear panel, flows through the cooling fins and then
exhausts through the front panel vent.
Heat sink temperature is monitored and controls the variable speed fan. Fan speed
increases only as required, keeping fan noise to a minimum.
If the heat sink surpasses its maximum allowed temperature, the thermal protection
circuit will activate and open the output relays allowing the amplifier to cool to a safe
temperature. To continue using the amp, it must be reset by turning the power off and
then turning it back on again.
Thermal protect activation only occurs under extreme thermal conditions and is not
part of normal operation.
powering
Unless otherwise specified when ordered, LT / ST amplifiers are supplied factory set
to following voltage options :
Option 1 US domestic nominal 120Vac 60Hz for rated power output
(safe operating range 100 - 132Vac )
Option 2 export models nominal 230Vac 50Hz for rated power output
(safe operating range 200 - 264Vac )
note
Due to the nature of the switching power supply in the ST, 50 - 60Hz operation is acceptable for both
options.
maintenance
LT / ST amplifiers require no routine maintenance.
If the amplifier is used in an extremely dusty or smoky environment , the unit should
be periodically blown free ( using compressed air ) of any foreign matter that may have
built up inside the unit.
Users will not need to make any adjustments to the amplifier during its lifetime.There
are no user-serviceable parts or adjustments that require opening the amplifier.
p. 9
features overview
3
front panel
rear panel
/
location of connectors and controls
/
legend of panel symbols
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