Crest audio PRO 200 User Manual
PRO 200 Series
Amplifier Owner’s Manual
Este símbolo tiene el propósito, de alertar al usuario de la presencia de “(voltaje) peligroso” sin aislamiento dentro de la caja del producto y que puede tener una magnitud suficiente como para constituir riesgo de descarga eléctrica.
Este símbolo tiene el propósito de alertar al usario de la presencia de instruccones importantes
sobre la operación y mantenimiento en la información que viene con el producto.
PRECAUCION: Riesgo de descarga eléctrica ¡NO ABRIR!
PRECAUCION: Para disminuír el riesgo de descarga eléctrica, no abra la cubierta. No hay piezas útiles
dentro. Deje todo mantenimiento en manos del personal técnico cualificado.
ADVERTENCIA: Para evitar descargas eléctricas o peligro de incendio, no deje expuesto a la lluvia o
humedad este aparato Antes de usar este aparato, Iea más advertencias en la guía de operación.
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.
Intended to alert the user of the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product.
CAUTION: Risk of electrical shock — DO NOT OPEN!
CAUTION: To reduce the risk of electric shock, do not remove cover. No user serviceable parts inside.
Refer servicing to qualified service personnel.
WARNING: To prevent electrical shock or fire hazard, do not expose this appliance to rain or moisture.
Before using this appliance, read the operating guide for further warnings.
Ce symbole est utilisé dans ce manuel pour indiquer à l’utilisateur la présence d’une tension dangereuse pouvant être d’amplitude suffisante pour constituer un risque de choc électrique.
Ce symbole est utilisé dans ce manuel pour indiquer à l’utilisateur qu’il ou qu’elle trouvera d’importantes instructions concernant l’utilisation et l’entretien de l’appareil dans le paragraphe signalé.
ATTENTION: Risques de choc électrique — NE PAS OUVRIR!
ATTENTION: Afin de réduire le risque de choc électrique, ne pas enlever le couvercle. Il ne se trouve à l’in-
térieur aucune pièce pouvant être reparée par l’utilisateur. Confiez I’entretien et la réparation de l’appareil à
un réparateur agréé.
AVERTISSEMENT: Afin de prévenir les risques de décharge électrique ou de feu, n’exposez pas cet
appareil à la pluie ou à l’humidité. Avant d’utiliser cet appareil, lisez attentivement les avertissements supplémentaires de ce manuel.
Dieses Symbol soll den Anwender vor unisolierten gefährlichen Spannungen innerhalb des Gehäuses
warnen, die von Ausreichender Stärke sind, um einen elektrischen Schlag verursachen zu können.
Dieses Symbol soll den Benutzer auf wichtige Instruktionen in der Bedienungsanleitung aufmerksam
machen, die Handhabung und Wartung des Produkts betreffen.
VORSICHT: Risiko — Elektrischer Schlag! Nicht öffnen!
VORSICHT: Um das Risiko eines elektrischen Schlages zu vermeiden, nicht die Abdeckung enfernen. Es
befinden sich keine Teile darin, die vom Anwender repariert werden könnten. Reparaturen nur von qualifiziertem Fachpersonal durchführen lassen.
ACHTUNG: Um einen elektrischen Schlag oder Feuergefahr zu vermeiden, sollte dieses Gerät nicht dem
Regen oder Feuchtigkeit ausgesetzt werden. Vor Inbetriebnahme unbedingt die Bedienungsanleitung lesen.
Important Safety Instructions
WARNING: When using electrical products, basic cautions should always be followed, including the following:
1. Read all instructions.
2. Keep all instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this device near water.
6. Clean only with a dry cloth.
7. Do not block any of the ventilation openings. Install
in accordance with manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves or other apparatus that produce heat.
9. Do not defeat the safety purpose of the polarized or
grounding-type plug. A polarized plug has two blades
with one wider than the other. A grounding type plug
has two blades and a third grounding plug. The wide
blade or third prong is provided for your safety.If the
provided plug does not fit into your outlet, consult an
electrician.
10. Protect the power cord from being walked on or
pinched, particularly at plugs, convenience receptacles,
and the point they exit from the apparatus.
11. Only use attachments/accessories provided by the
manufacturer.
12. Use only with a cart, stand, tripod,bracket, or table
specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the
cart/apparatus combination to avoid injury from tipover.
13. Unplug this device during lightning storms or when
unused for long periods of time.
14. Refer all servicing to qualified service personnel.
Servicing is required when the device is damaged in any
way, such as liquid has been spilled or objects have fallen
into the device, the unit has been exposed to rain or
moisture, does not operate normally, or has been
dropped.
15. Never break off the ground pin.Connect only to a
power supply of the type marked on the unit adjacent
to the power supply cord.
16. If this product is to be mounted in an equipment
rack, rear support should be provided.
17. Exposure to extremely high noise levels may cause a
permanent hearing loss. Individuals vary considerably in
susceptibility to noise-induced hearing loss, but nearly
everyone will lose some hearing if exposed to sufficiently intense noise for a sufficient time.
The U.S. Government’s Occupational and Health
Administration (OSHA) has specified the following permissible noise level exposures:
Sound Duration Per Day In Hours Sound Level dBA, Slow Response
8 90
6 92
4 95
3 97
2 100
1 1/2 102
1 105
1/2 110
1/4 or less 115
According to OSHA, any exposure in excess of the above permissible limits could result in some hearing loss. Ear
plugs or protectors inserted into the ear canals or over the ears must be worn when operating this amplification system in order to prevent a permanent hearing loss, if exposure is in excess of the limits listed above.To ensure against
potentially dangerous exposure to high sound pressure levels,it is recommended that all persons exposed to equipment capable of producing high sound pressure levels be protected by hearing protectors.
SAVE THESE INSTRUCTIONS!
p. 1
Table Of Contents
1
2
3
4
5
6
7
How To Use This Manual
p.2
Introduction
Terms & Conventions
Installation
p.3
Unpacking
Mounting
Cooling Requirements
Additional Guidelines
Maintenance
Features Overview
p.7
Front Panel
Rear Panel
Operation Modes
p.13
Stereo
Parallel
Bridged
Connections
p.15
Power
Input
Output
Safety
p.19
User Responsibility
Speaker Protection
Protection Circuitry
Service, Support & Warranty
p.23
Support
Contact Crest
Warranty
Specifications
p.25
Block Diagram
p.26
Wire Gauge Chart
p.27
b
c
a
Contents
Appendices
p.2
How to use this manual
1
Introduction
Congratulations on your purchase of a Crest Audio Pro 200 Series power amplifier.
Designed for years of reliable operation under rigorous use, these power amplifiers offer the
sonic superiority and unsurpassed reliability for which Crest Audio is famous. Advanced
technology and extensive protection circuitry allow more efficient operation, especially when
working with difficult loads and power conditions.The Automatic Clip Limiting (ACL) circuit
protects drivers, maintains sonic integrity and ensures trouble-free operation into loads as
low as 2 Ohms.
Crest Audio’s high efficiency design uses tunnel-cooled heat sinks and variable-speed DC fans
to maintain a lower overall operating temperature, resulting in longer output transistor life.
Pro 200 Series models 8200, 7200 and 5200 use Crest Audio’s innovative Power Density circuitry and packaging.
Although these amplifiers are simple to operate and housed in ultra-strong steel chassis,
improper use can be dangerous.These are very high-powered amplifiers that can put out
high voltages and sizable currents at frequencies up to 30 kHz. Always use safe operating
techniques with these amplifiers.
FOR YOUR SAFETY, READ THE IMPORTANT PRECAUTIONS SECTION AS
WELL AS THE INPUT, OUTPUT AND POWER CONNECTION SECTIONS
OF THIS MANUAL.
Conventions
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
Installation
2
Unpacking
Mounting
Cooling
Requirements
Additional
Guidelines
Maintenance
/
What to do with the shipping carton
/
Proper rack-mounting technique
/
Keeping the amplifier cooled
/
Tips for trouble free operation
/
Routine maintenance practices
Pro 200 Series Owner’s Manual
p.4
Installation
2
Unpacking
Upon unpacking, be sure to inspect the amplifier. If you find any damage, notify your
supplier immediately. Only the consignee may institute a claim with the carrier for
damage incurred during shipping.Be sure to save the carton and all packing materials.
Should you ever need to ship the unit,use only the original factory packing. If the shipping carton is unavailable, contact Crest to obtain a replacement.
Mounting
Pro 200 Series amplifiers will mount in standard 19" racks. Rear mounting ears are
also provided for additional support,which is recommended in non-permanent installations like mobile or touring sound systems. Because of the cables and connectors
on the rear panel, a right-angle or offset screwdriver or hex key will make it easier to
fasten the rear mounting ears to the rails.
Front Width 19"/ 483mm
Front Panel (8200 shown - 7200 & 5200 have the same dimensions)
For replacement
packaging, call Crest
Audio’s Customer Service
Department directly.
see—service and support
+
Rear Panel
Side Panel
Rear Width 17"/ 432mm
Front
Height
3.47"/
89 mm
Front
Height
3.47"/
88mm
Depth13.75"/349 mm (including rear suppor t ears)
p. 5
Installation
2
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 standard-rack-space opening
for every four amps.
a
Cooling Requirements
Pro 200 Series amplifiers use a forced-air cooling system to maintain a low, even
operating temperature. Air is drawn into the amplifier by fans on the rear panel,
which passes over the cooling fins of the heat sinks and exhausts through the front
grille. If either heat sink gets too hot, its sensing circuit will open the output relay,
disconnecting the load from that particular channel. It is important to have an adequate air supply at the back of the amplifier, and enough space around the front of
the amplifier to allow the cooling air to escape. If the unit is rack mounted, do not
use doors or covers on the front of the rack; the exhaust air must flow without
restriction.If you are using racks with closed backs, use fans on the rear rack panel
to pressurize the rack to ensure an ample air supply. Also make sure there is one
standard rack space opening for every three mounted power amplifiers.
Maintenance
Pro 200 Series amplifiers require little routine maintenance.
When used in an extremely dusty or smoky environment , it should be periodically blown free (using compressed air) of any foreign matter that may have built up
inside.
When used in an environment where residue from smoke/fog machines is regularly present, the amplifier(s) should be periodically checked (by authorized Crest service personnel) for build-up of that residue
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 unit.
Additional Guidelines
Make sure the mains voltage is correct and the same as that printed on the rear of
the amplifier. Damage caused by connecting the amplifier to improper AC voltage is
not covered by any warranty. See the Connecting Power section in Chapter 5 for
more information on voltage.
Note — Always turn off and disconnect the amplifier from mains voltage before
making audio connections. As an extra precaution, have the attenuators turned
down during power-up.
Although Pro 200 Series amplifiers have AutoRamp circuitry,which raises the signal
level gradually after the output relay closes, it is always a good idea to have the gain
controls turned down during power-up. This will prevent speaker damage if there
is a high signal level at the inputs. Whether you buy or make them,use high quality
connections, input cables and speaker cables, along with a good soldering technique.
Most intermittent problems are caused by faulty cables.
Consult the the Wire Gauge Charts in Appendix C to determine proper gauges for
different load impedances and cable lengths. Cable resistance robs amplifier power
in two ways: power lost directly to resistance (I2R loss) and by lowering the total
load impedance. Also make sure the mode switch is set correctly for the desired
application. See Chapter 4 for more information on modes.
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