Telex CP 1200 User Manual
OWNER‘S MANUAL
BEDIENUNGSANLEITUNG
CP 1200
PRECISION SERIES
CONTENTS
IMPORTANT SAFETY INSTRUCTIONS ....................... 3
IMPORTANT SERVICE INSTRUCTIONS ....................... 3
DESCRIPTION ....................... 4
UNPACKING & WARRANTY ....................... 5
INSTALLATION NOTES ....................... 5
FRONT VIEW ....................... 6
REAR VIEW ....................... 7
INPUT A / INPUT B ....................... 7
PARALLEL ....................... 7
POWER AMP OUTPUT ....................... 8
BRIDGED MODE ....................... 8
GROUND-LIFT SWITCH ....................... 8
MAINS INPUT ....................... 8
SPECIFICATIONS / TECHNISCHE DATEN ....................... 20
BLOCK DIAGRAM ....................... 21
DIMENSIONS / ABMESSUNGEN ....................... 22
WICHTIGE SICHERHEITSHINWEISE ....................... 13
WICHTIGE SERVICEHINWEISE ....................... 13
BESCHREIBUNG ....................... 14
AUSPACKEN & GARANTIE ....................... 15
INSTALLATIONSHINWEISE ....................... 15
FRONTSEITE ....................... 16
RÜCKSEITE ....................... 17
INPUT A / INPUT B ....................... 17
PARALLEL ....................... 17
ENDSTUFENAUSGÄNGE ....................... 18
BRIDGED MODE ....................... 18
GROUND-LIFT SCHALTER ....................... 18
NETZEINGANG ....................... 18
NETZBETRIEB & WÄRMEENTWICKLUNG ....................... 19
SPECIFICATIONS / TECHNISCHE DATEN ....................... 20
BLOCK DIAGRAM ....................... 21
DIMENSIONS / ABMESSUNGEN ....................... 22
2
IMPORTANT SAFETY INSTRUCTIONS
The lightning ash with arrowhead symbol, within an
equilateral triangle is intended to alert the user to the
presence of uninsulated „dangerous voltage“ within
the product’s enclosure that may be of sufcient
magnitude to constitute a risk of electric shock to
persons
The exclamation point within an equilateral
triangle is intended to alert the user to
the presence of important operating and
maintance (servicing) instructions in the
literature accompanying the appliance.
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water. Do not expose this apparatus to dripping or splahing and
ensure that no objects lled with liquids, such as vases, are placed on this apparatus.
6. Clean only with a dry cloth.
7. Do not block any of the ventilation openings. Install in accordance with the anufactures instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus
(including ampliers) that produce heat.
9. Only use attachments/accessories specied by the manufacturer.
10. Refer all servicing to qualied service personnel. Servicing is required when the apparatus has been
damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or
objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not
operate normally, or has been dropped
11. To completely disconnect mains power from this apparatus, the power supply cord must be
unplugged.
For US and CANADA only:
Do not defeat the safety purpose of the grounding-type plug. A grounding type plug has two blades and a third
grounding prong. The wide blade or the third prong are provided for your safety. When the provided plug does not
t into your outlet, consult an electrican for replacement of the absolete outlet.
IMPORTANT SERVICE INSTRUCTIONS
CAUTION: These servicing instructions are for use by qualied personnel only. To reduce
the risk of electric shock, do not perform any servicing other than that ontained
in the Operating Instructions unless you are qualied to do so. Refer all servicing
to qualied service personnel.
1. Security regulations as stated in the EN 60065 (VDE 0860 / IEC 65) and the CSA E65 - 94 have to
be obeyed when servicing the appliance
2. Use of a mains separator transformer is mandatory during maintenance while the appliance is
opened, needs to be operated and is connected to the mains
3. Switch off the power before retrotting any extensions, changing the mains voltage or the output voltage.
4. The minimum distance between parts carrying mains voltage and any accessible metal piece (metal
enclosure), respectively between the mains poles has to be 3 mm and needs to be minded at all times.
The minimum distance between parts carrying mains voltage and any switches or breakers that are not
connected to the mains (secondary parts) has to be 6 mm and needs to be minded at all times.
5. Replacing special components that are marked in the circuit diagram using the security symbol (Note) is
only rmissible when using original parts.
6. Altering the circuitry without prior consent or advice is not legitimate.
7. Any work security regulations that are applicable at the location where the appliance is being serviced
have to be strictly obeyed. This applies also to any regulations about the work place itself.
8. All instructions concerning the handling of MOS - circuits have to be observed.
NOTE:
SAFETY COMPONENT ( MUST BE REPLACED BY ORIGINAL PART )
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5
DESCRIPTION
Congratulations! With buying a Electro-Voice CP-SERIES power amplier you have chosen an appliance that employs most advanced technology.
CP-Series power amps combine outstanding audio performance, highest reliability and operational
safety.
The audio performance of CP 1200 power amp is simply extraordinary. Optimised power supply units
employing low-leakage toroidal transformers provide extensive headroom far above the stated nominal
output. At the same time this contributes to a reduction in weight and power dissipation.
The CP 1200 is designed in Class-AB technology, have been designed to full even the most demanding
requirements of touring applications. The CP 1200 amp is protected against thermal and electrical
overload, short circuit and the occurrence of HF/DC at the outputs. Back-EMF-Protection eliminates
the risk of the output transistors being damaged by electrical energy back-feed. The power outputs are
switched via relay with a time delay during soft-start. An inrush current limiter prevents mains fuses from
blowing.
Mechanical construction and workmanship also comply with the highest precision manufacturing
standards. The rigid sheet steel chassis even resists the most wearing tour operation. Two three-speed
high performance fans (off/slow/fast) guarantee outstanding thermal stability at absolute low running
noise. The ventilation is directed front-to-rear allowing trouble-free operation even in smaller amp-racks.
The electronically balanced inputs are carried out via XLR-type connectors (female). Direct-Outs for
through connecting the audio signal are also provided via XLR-type connectors (male). Input routing
allows selecting DUAL (stereo) or PARALLEL (mono) operation mode. By means of the separate
BRIDGED OUT-connector and a Bridged Mode-switch, switching to „Mono Bridged”-operation is truly
uncomplicated as well.
The recessed mounted dB-scaled level controls ensure reliable protection against mechanical damage.
These particularly precise, secure to operate detent-potentiometers are located on the front panel.
The easily readable LED display provides a quick overview of the power amp’s current operational
status. The power outputs CHANNEL A, CHANNEL B and BRIDGED OUT are carried out as extremely
durable SPEAKON-type connectors. Also located on the rear panel is a Ground-lift switch, which helps
eliminating ground-noise loops by separating the power amp’s enclosure from circuit ground. In normal
operation, the CP 1200 power amp is capable of driving loads as low as 2ohms. In Mono-Bridged mode
the allowable minimum load is 4ohms.
CP-Series power amps provide the opportunity for retrotting an internal analogue signal processor
board with x-over and lter functions.
This owner’s manual outlines and explains several other features of your CP 1200 power amplier.
Please, make sure to carefully read all of it and mind the instructions.
4
DESCRIPTION
UNPACKING & WARRANTY
Carefully open the packaging and take out the power amplier. Next to the power amplier itself, the
package also includes this owner’s manual, a mains cord and the warranty certicate. Keep the original
invoice, which states the purchase/delivery date together with the warranty certicate at a safe place.
INSTALLATION NOTES
Generally, installing or mounting power amps should be carried out in a way that guarantees continuously unopposed front-to-rear air circulation. Installation of appliances with opposite air circulation within
one cabinet or closed rack shelf system is not recommended. When including an appliance in a closed
cabinet or rack shelf system make sure to provide sufcient ventilation. Leave a gap of at least 60mm
x 330mm (up to the cabinet’s top ventilation louvers) for air circulation between the rear of the power
amplier and the cabinet’s/rack’s rear inner wall. Make sure to leave at least 100mm of space above the
cabinet or rack shelf system. Since temperatures inside of the cabinet or rack shelf system can easily
rise up to 40°C during operation, bearing in mind the maximally allowable environmental temperature
during operation for all other appliances installed in the same rack shelf system is mandatory (also refer
to “MAINS OPERATION AND RESULTING TEMPERATURE”).
Caution: For trouble-free operation exceeding the maximally allowable environmental temper-
ature of +40°C is not permissible.
The use of installation rails or optionally available “rear-rack-mount” rails is strongly recommended when
installing the appliance in a rack shelf system or cabinet to prevent the front panel from bending.
The power amplier has to be protected against: dripping or splashing water, direct sunlight, high temperatures or direct inuence of heat sources, high humidity, extensive dust and vibrations.
Condensation on internal parts may occur when transporting the power amplier from a cold into a
warmer environment. In that case operation is only permissible after the appliance has gained the
new temperature (after approximately one hour). If foreign objects or liquids have entered the power
amplier’s enclosure make sure to instantly separate the appliance from the mains power and contact
an authorised service centre for inspection before continuing operation.
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7
FRONT PANEL
Use the POWER switch, located on the front panel’s, right side to switch the appliance’s power on. The
soft-start function limits against current inrush peaks on the mains, which in addition prevents the mains
line protection switch from activating during power-on. The loudspeaker outputs are activated via relay
switching with a delay of approximately 2 seconds to efciently attenuate eventual power-on noise. The
PROTECT LED lights during the delay time and the fans run at maximum speed. This is normal, conrm-
ing the immaculate operation of the protection circuitry.
This indicator lights when the power amplier has been switched on. Causes for the
POWER-indicator not lighting are: the appliance is not connected to the mains
or the primary fuse is defective.
The PROTECT LED indicating that one of the internal protection circuits
against thermal overload, short-circuit, Back-EMF, HF-occurrence at the output,
etc., has been activated. The output relays interrupt the connected loads from
the power amps while input signals are interrupted as well, preventing the connected
loudspeaker systems and the power ampliers themselves from being damaged.
Whatever caused the fault – e.g. a short-circuited speaker cable – needs to be reme-
died. In case of thermal overload you have to wait until the power amplier automatically regains normal operation.
The SIGNAL LED lights as soon as an audio signal of approximately 30dB below full
modulation is present at the output. The LED is dimmed when speaker cables are
short-circuited or a protection circuit has been activated.
The 0dB LED lights whenever the power amplier is driven at its maximum. Higher
input voltage does not result in higher peak output voltage. In addition, the 0dB
indicator comes in handy when adjusting external limiters.
This indicator lights as soon as the integrated dynamic audio signal limiter is
activated and the power amplier is driven at the clipping limit or generally at its
maximum capacity. Short-term blinking is not a problem, because the internal limiter
controlls input levels of up to +21dBu down to a THD of approximately 1%. If, on the
other hand, this LED lights constantly, reducing the volume is recommended to
prevent the loudspeaker systems connected from being damaged by probable
overload.
Detent potentiometers scaled in dB (steps of 1dB) for
adjusting the power amp’s overall volume. To prevent
distortion in mixing consoles connected to your CP-Series
amp, setting these controls to a value between 0dB and -6dB
is generally recommended. The dB-scale provides direct
indication of the control attenuation applied to the xed
internal amplication.
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REAR PANEL
INPUT A / INPUT B
The inputs INPUT A & INPUT B are electronically balanced
for direct connection of mixing consoles, signal processors,
etc.
The XLR-type connectors OUTPUT A & OUTPUT B are pre-
pared for „through-connecting“ input signals to additional external power amps. The input signal is directly routed to these
output connectors. There are no repeaters or other electronic
components within that signal path. Accordingly, input and output connectors of the corresponding
channel are interconnected in parallel, offering permanent electrical connection, without regard to the
setting of the Power-ON switch.
Although having XLR-type output connectors, some mixing console models provide unbalanced output
connection only. When using mixers with unbalanced outputs, bridging PIN1 and PIN3 of the power
amp’s input connectors or leaving PIN3 of the cable’s plugs unconnected is necessary. Otherwise, when
feeding in unbalanced audio signals via PIN3 (b, -, „cold“) and PIN2 (a, +, „hot“), strange humming and
HF-interference may occur, which very likely will damage the power amplier and/or the connected
speaker cabinets.
NF-CONNECTION CORDS
Choosing high-quality balanced cables (two conductors for the audio signal plus separate shielding
mesh) with XLR-type connectors is recommended for LF-signal connection. Although connecting unbalanced cables to the power amplier inputs is possible as well, using balanced cables is always preferable. A great number of today’s audio appliances employ balanced outputs. With balanced cabling,
the shield connects all metal enclosure parts and therefore efciently eliminates the introduction of
external interference – mostly noise and hum.
XLR-type connector pin-assignment
XLR (male) XLR (female)
PARALLEL
The input connectors of channel A and channel B are electrically connected
in parallel when the selector switch is set to PARALLEL. However, individually
controlling the volume of both channels is still possible via the corresponding level
controls A and B.
DUAL
If the selector switch is set to DUAL, the audio signals of channels A and B are
independently amplied.
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REAR PANEL
POWER AMP OUTPUT CONNECTORS
Power amp output connection for the two channels A
(left) and B (right) is provided via SPEAKON-type output
connectors.
A plastic cover to prevent inadvertent erroneous
connection protects the BRIDGED OUT connector. Make
sure to remove the cover only when actually operating
the power amplier in Bridged-Mode.
BRIDGED MODE
With the BRIDGED-MODE switch being engaged, using the channel A input
for audio signal feed is mandatory, since input B provides no function. While
the amplier of channel A operates as usual, the audio signal is internally
inverted and routed to the amplier of channel B. Both amps – A and B – now
work in push-pull operation to provide doubled output voltage at the
BRIDGED-OUT connector.
The regular output voltage of each amplier channel A / B is still present at the
corresponding output connector CHANNEL A or CHANNEL B. However, using these signals is not recommendable because of the aforementioned phase
inversion. Operating the power amp in Bridged Mode with loads of 2ohms connected is not allowable.
CAUTION: Extremely high voltages might be present at the BRIDGED OUT connector during
Bridged-Mode operation. The connected loudspeaker systems have to be capable of handling
such high voltages. Please make sure that power handling specications as stated in the documentation supplied with your speaker systems match the specications of the power amplier.
GROUND-LIFT SWITCH
The ground-lift switch allows eliminating noise loops. If the power amplier is
operated together with other equipment in a 19“ rack-shelf, setting the switch
to its GROUNDED position is recommended. If the power amplier is operated
together with appliances with differing ground potentials, set the switch to its
UNGROUNDED position.
MAINS INPUT
Under normal circumstances, the mains fuse only blows in case of fault.
Replacing the fuse is only permissible when using a new fuse of the same
type with identical amperage, voltage and blow characteristics. If the mains
fuse blows more often, please contact an authorized service centre.
The high-performance mains cord supplied with your power amplier complies
to applicable safety regulations, plus that its diameter corresponds to the power amp’s power output capacity. Make sure to use the supplied mains cord for connecting the power amp
to the mains, if possible. Using mains cords with smaller diameters results in higher leakage and consequently reduced maximum power output capacity.
At 100V and 120V units the mains fuse is installed internally. This is fore safety reasons. In case of a
blown mains fuse please contact a qualied service personnel for servicing.
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