Peavey CS2000H Mode D'emploi page 10

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S S h h o o r r t t C C i i r r c c u u i i t t
If an output is shorted, the LFC and thermal circuits will automatically protect the amplifier. The LFC
circuit senses the short circuit as an extremely stressful load condition and attenuates the signal,
protecting the channel's output transistors from over current stress. If the short circuit remains, the
channel will eventually thermally protect itself by disconnecting the load.
D D C C V V o o l l t t a a g g e e P P r r o o t t e e c c t t i i o o n n
If an amplifier channel detects DC voltage or subsonic frequencies at its output terminals, its output
relay will immediately open to prevent loudspeaker damage. The channel's DC LED will light.
T T u u r r n n - - O O n n / / T T u u r r n n - - O O f f f f P P r r o o t t e e c c t t i i o o n n
At power-up, the amplifier stays in the protect mode, with outputs disconnected, for approximately
four seconds while the power supplies charge and stabilize. While the output relays are open, the DDT
LEDs light. When power is removed, the speaker loads immediately disconnect so that no thumps or
pops are heard.
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R R a a m m p p U U p p S S i i g g n n a a l l C C o o n n t t r r o o l l
Whenever amplifier powers up or comes out of a protect mode, the RampUp
the speakers are disconnected, the RampUp
closes, the signal slowly and gradually raises up to its set level. The RampUp
has some important advantages over the conventional instant-on circuits:
If a signal is present during power-up (or when coming out of protect), the speakers are
spared a sudden, potentially damaging burst of audio power.
Because the gain is reduced until after the output relay closes, no arcing occurs at the
contacts, thereby extending their useful life.
S S p p e e a a k k e e r r P P r r o o t t e e c c t t i i o o n n
All loudspeakers have electrical, thermal and physical limits that must be observed to prevent
damage or failure. Too much power, low frequencies applied to high frequency drivers, severely
clipped waveforms, and DC voltage can all be fatal to cone and compression drivers. The Peavey
CS2000H amplifier automatically protects speakers from DC voltages and subsonic signals. For more
information, see the section on Protection Features. Mid- and high-frequency speakers, especially
compression drivers, are highly susceptible to damage from overpowering, clipped waveforms, or
frequencies below their rated pass band. Be extremely careful that the low and mid bands of an
electronic crossover are connected to the correct amplifiers and drivers and not accidentally
connected to those for a lower frequency band. The amplifier's clipping point is its maximum peak
output power, and the high power Peavey CS 2000H amplifier can deliver more power than many
speakers can safely handle. Be sure the peak power capability of the amplifier is not excessive for
your speaker system.
Fuses may also be used to limit power to speaker drivers, although as current-limiting rather than
voltage-limiting devices, they are an imperfect solution, and as the weakest links, they only limit once
before needing replacement. Some poor quality fuses have a significant series resistance that could
degrade the amplifier's damping of the speaker's motion and may even deteriorate the system's
sound quality. If you elect to use fuses, check with the speaker manufacturer to determine the proper
current rating and time lag required.
Do not drive any low-frequency speaker enclosure with frequencies lower than its own tuned
frequency; the reduced acoustical damping could cause a ported speaker to bottom out even at
moderate power. Consult the speaker system specifications to determine its frequency limits.
A A m m p p l l i i f f i i e e r r M M a a i i n n t t e e n n a a n n c c e e a a n n d d U U s s e e r r R R e e s s p p o o n n s s i i b b i i l l i i t t y y
A CS 2000H amplifier requires no other routine maintenance and should never need any internal
adjustment during its lifetime. Your CS 2000H amplifier is very powerful and can be potentially
dangerous to loudspeakers and humans alike. It is your responsibility to read the Important
Precautions section and to make sure that the amplifier is installed, wired and operated properly as
instructed in this manual. Many loudspeakers can be easily damaged or destroyed by overpowering,
especially with the high power available from a bridged amplifier. Read the Speaker Protection section
and always be aware of the speaker's continuous and peak power capabilities.
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circuit fully attenuates the signal. After the output relay
10
™ circuit activates. While
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Signal Control circuit