Protection Features

RampUp™ Signal Control

Whenever a CS® Series 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 and activates the DDT™ LED. After the output relay closes, the signal slowly and gradually raises up to its set level. The PWR LED will illuminate and the DDT LED will turn off when the signal is no longer attenuated. The RampUp Signal Control circuit has some important advantages over the conventional instant-on circuits:

1.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.

2.Because the gain is reduced until after the output relay closes, no arcing occurs at the contacts, thereby extending their useful life.

Speaker Protection

All loudspeakers have electrical, thermal and physical limits that must be observed to prevent damage or failure. Excessive power, low frequencies applied to high frequency drivers, severely clipped waveforms, and DC voltage can all be fatal to cone and compression drivers. Peavey CS Series amplifiers automatically protect speakers from DC voltages and subsonic signals. If using an electronic crossover, be extremely careful that the low and mid bands are connected to the correct amplifiers and drivers and not to those designed for a higher frequency band. An amplifier’s clipping point is its maximum peak output power, and some of the higher powered Peavey CS Series amplifiers 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. For more information, see the section on Protection Features.

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 deterio- rate 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 acousti- cal 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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Peavey CS 4000, CS 4080 owner manual Speaker Protection, RampUp Signal Control
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CS 4080, CS 4000 specifications

The Peavey CS 4000 and CS 4080 are powerful professional amplifiers, designed to deliver exceptional performance in various audio applications, including live sound, installations, and more. Renowned for their reliability and high output capabilities, these amplifiers have become staples in many sound reinforcement setups.

The CS 4000 is a dual-channel amplifier that produces up to 2,000 watts of continuous power at 4 ohms. This amplifier is well-suited for driving large speaker arrays, making it ideal for concert venues, clubs, and outdoor events. Meanwhile, the CS 4080 ups the ante, offering 4,000 watts of power at 2 ohms, making it an excellent choice for those who need even more headroom and clarity in demanding environments. Both models feature Peavey’s renowned DDT (Dynamic Delay Time) compression technology, which protects against clipping and distortion, ensuring that audio remains clean and defined even at high volumes.

The CS series also includes advanced thermal management systems, which prevent overheating and contribute to prolonged operational life. With forced-air cooling and highly efficient heat sinks, both amplifiers maintain optimal temperatures, even during extended use. The rugged construction provides durability, making them suitable for on-the-road applications as well as permanent installations.

Input flexibility is another key feature of the Peavey CS amplifiers. They come equipped with XLR and 1/4-inch TRS inputs, facilitating seamless integration with various audio sources. Output options include speakON and binding post connectors, ensuring compatibility with a wide range of speaker configurations.

User-friendly controls such as level adjustment knobs on the front panel allow for easy tweaking of output levels. Additionally, the CS 4080 has a built-in Limiter indicator, providing useful feedback on signal levels to prevent unintentional overloading.

Both amplifiers also feature a switchable low-frequency filter, enhancing the overall performance of the sound system by reducing unwanted subsonic frequencies. With their robust power output, technological advancements, and reliable performance, the Peavey CS 4000 and CS 4080 are widely regarded as industry standard amplifiers, capable of meeting the rigorous demands of professional audio environments. Whether for touring musicians, DJs, or permanent installations, the CS series continues to impress audio professionals worldwide.
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