Peavey CS 1200H, User Manual

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Whenever amplifier powers up or comes out of a protect mode, the RampUp ™ circuit activates. While
the speakers are disconnected, the RampUp ™ circuit fully attenuates the signal. After the output relay
closes, the signal slowly and gradually raises up to its set level. The RampUp ™ Signal Control circuit 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.
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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 CS 1200H
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 1200H 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.
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A CS 1200H amplifier requires no other routine maintenance and should never need any internal
adjustment during its lifetime. Your CS 1200H 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.