Biamp System Notes

The term headroom deserves some consideration. Program material (music or speech) is made up of many different frequencies and their harmonics. Most music, especially contemporary rock music, is bass-heavy. That is, the low-frequency material contains much more energy than the high-frequency material. If both high- and low-frequency material, such as voice and bass guitar, are present in a full-range system, the high- energy bass frequencies can use up most of the power available from the power amplifier, leaving little (or none) for the high frequencies. The result usually is severe clipping (distortion) of the high-frequency material. In a biamplified system, the high-frequency material is routed to its own power amplifier (and associated loudspeaker), which avoids the clipping problem. This results in an effective increase in system headroom that is greater than that which is obtained by simply using a second power amplifier/speaker combination in full-range operation. To biamp, then, some type of active crossover is employed in the mixer feed to separate the low- and high-frequency material, which is then patched to separate power amplifiers to drive separate loudspeaker components. Such a system is easily accomplished with the Peavey CS 1000X power amplifier patch panel and associated CS Series plug-in active crossover modules.

The Peavey DDT compression system adds a totally new dimension to the typical biamped system. Each power amplifier channel now has its own Distortion Detection Technique circuitry, and each is completely independent. When signal conditions exist that could cause clipping in the low-frequency power amp channel(s), the DDT system will simply limit that portion of the total biamp system. This will in no way affect the high-frequency portion of the biamp system, and it is free to increase in level until conditions exist that could cause clipping in that particular power amp channel(s). At that point, the DDT system will limit the high-frequency portion of the system. This is a very effective two-level compression system and will yield sound pressure levels unmatched by conventional broad-band compression techniques.

1.A biamp configuration is only possible with loudspeaker systems that provide access to the individual speaker components, bypassing the built-in passive crossover (most Peavey systems offer biamp high and low switching jacks on the back panel).

2.The crossover module used must have the proper characteristics to match the particular loudspeaker system. Of greatest importance is the crossover frequency. Peavey offers a variety of plug-in crossover modules that are specifically designed to match the various loudspeakers in the Peavey product line. These crossovers have the correct crossover frequency, high-frequency pad, and equalization for the particular loudspeaker, resulting in system performance with a very flat frequency response. Also available are general purpose crossover modules at various frequencies from 100 to 5000 Hz for non-Peavey loudspeaker systems.

3.The outputs of the crossover modules (both high and low) can drive several power amp inputs. The parallel input jacks can be used to daisy-chain to additional power amps for an expanded system on either the low- or high-frequency system (or both). Remember, the components in most Peavey biampable speaker systems are 8 ohms. All Peavey CSX series power amplifiers are now rated at 2 ohms. This means that the allowable maximum number of components connected to any one particular power amplifier channel is four (four horns, four woofers). If additional components are required in larger systems, more power amp channels are needed. Often experienced sound technicians limit the maximum number of components to three per power amp channel. This practice allows the power amplifiers to run much cooler and creates a system that is less likely to shut down thermally in a high-temperature environment!

4.The PL-2 transformer module can be removed and the jumper reinstalled in any particular crossover island if a balanced input is not desired or required for the crossover module. In this case, the associated XLR connector (11) is now unbalanced as per previous discussion. If desired, the parallel unbalanced phone jack inputs (13) may be used to supply signal to the crossover module. In addition, whenever the XLR connector on a particular crossover island is used (either balanced or

CS 1000X specifications

The Peavey CS 1000X is a professional power amplifier designed to deliver exceptional sound quality and reliability for live performances and installed sound applications. Renowned for its rugged build and innovative technologies, the CS 1000X has become a staple in various settings such as concert venues, clubs, and corporate events.

One of the standout features of the CS 1000X is its power output. It provides 1,000 watts of continuous output at 4 ohms, making it capable of driving large audio systems with ease. This significant power ensures that even the most demanding musical passages can be reproduced accurately without distortion. Its high-efficiency design enables it to deliver exceptional performance while consuming less energy, making it not only powerful but also environmentally friendly.

The amplifier utilizes a patented Peavey Dynamic FET technology, which enhances the overall sound quality by providing a wide frequency response and minimal distortion levels. This technology also contributes to the amplifier's impressive dynamic range, ensuring that both soft and loud sounds are reproduced with clarity and precision.

The CS 1000X features advanced circuit protection systems, including Peavey's exclusive DDT (Dynamic Distortion Termination) clipping protection. This feature prevents distortion and potential damage to connected speakers during peak output, allowing for safe operation under high-demand conditions. Additionally, the amplifier includes a built-in cooling fan that ensures optimal thermal management, prolonging the lifespan of the unit.

In terms of connectivity, the CS 1000X is equipped with a variety of input and output options. These include balanced XLR inputs and both binding post and SpeakON outputs, providing flexibility for different configuration needs. The rear panel also features level controls, allowing users to adjust the output level to suit the requirements of their specific audio setup.

Compact yet powerful, the Peavey CS 1000X is designed with a rugged chassis that can withstand the rigors of transport and installation. This durability, paired with its technical capabilities, makes it an excellent choice for both professional musicians and sound engineers.

In summary, the Peavey CS 1000X power amplifier stands at the forefront of audio technology, combining robust power, advanced protection features, and versatile connectivity options. Its ability to deliver high-quality sound makes it an indispensable tool for any serious audio application.