Recommendations for Installation

The CPS250/CPS275 power supply is provided with front panel fixing holes for 19" rack-mounting and will occupy 2U of rack space.

As with any power supply that contains a large mains-voltage transformer, it is preferable to provide a degree of physical isolation of the unit from other electronic equipment, particularly that which carries low level audio signals, to avoid any possible hum pick-up. For this reason the unit is used with a long (7 metres) output cable to enable it to be positioned away from the mixing console.

For the same reason, when rack-mounting it is preferable to avoid locating the unit adjacent to signal processing equipment.

It should be noted that if a complete rack containing a CPS250/CPS275 unit is to be operated from a different mains supply level, then the unit should be withdrawn from the rack in order to reselect the mains voltage setting, at the same time as resetting any other equipment.

The other important consideration when rack-mounting the unit is the need for natural convection of air over the case and an unrestricted air flow through the unit. Note that air is drawn in at the rear of the unit and expelled through the front panel.

Good ventilation BELOW the unit, in the floor or back of the rack, and similarly ABOVE the unit, at the top of the rack, will ensure a path for continuous air flow.

Other equipment in the rack which is known NOT to produce a significant amount of heat should be mounted BELOW the unit. Equipment that also relies on good air flow within the rack (ie. most power amplifiers and other power supplies) should be given due consideration and some space should be provided between such units and between these and the CPS250/CPS275 unit. Forced convection, by means of a fan-tray, may be desirable in this situation.

The CPS250/CPS275 will operate as a free-standing unit without requiring any special cooling arrangement, but should not be allowed to be accidentally or deliberately covered over in any way.

Do not operate the unit with the top cover removed.

The air intake and outflow holes must be inspected regularly and cleaned if necessary to maintain good airflow through the unit. This will be particularly important if the unit is used in a dusty environment.

Finally, some consideration should be given to the earthing arrangement of the system at the centre of which are the console and the CPS250/CPS275 (and any other Soundcraft power supply units). The console chassis is earthed, through the mains earth, via the power supply. When rack-mounting the CPS250/CPS275(and any other Soundcraft power supply units) care should be taken to avoid any possible ‘ground loops’ in the system which would introduce audible hum to otherwise clean audio signals. Ground loops may occur where signal processing equipment, patched to the console, has its signal earth commoned to the equipment chassis. The ground loop is

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Installation

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SoundCraft CPS275, CPS250 technical manual Recommendations for Installation
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CPS250, CPS275 specifications

SoundCraft is renowned for producing high-quality audio mixing consoles that cater to a wide range of audio professionals and enthusiasts. Among their notable offerings are the SoundCraft CPS275 and CPS250 power amplifiers, which combine innovative technologies with reliable performance.

The SoundCraft CPS275 is a powerhouse designed to deliver a robust output with exceptional clarity. It features a dual-channel configuration, providing 275 watts per channel into 4 ohms. The CPS275 is built with a solid-state design, ensuring high efficiency and minimal distortion, making it suitable for both live performances and studio applications. One of its distinguishing features is the advanced thermal protection system, which safeguards the amplifier from overheating, ensuring longevity and reliability even in demanding environments.

On the other hand, the SoundCraft CPS250 is a slightly smaller model, ideal for users seeking a balance between power and portability. It offers 250 watts per channel into 4 ohms, making it perfect for smaller venues or monitors. This model emphasizes versatility and sound fidelity, featuring a class AB circuitry that enhances audio accuracy while maintaining low noise levels.

Both the CPS275 and CPS250 come equipped with comprehensive protection circuitry, which includes short-circuit, overload, and DC protection. This guarantees that both amplifiers will perform consistently without risking damage to connected equipment.

In terms of connectivity, these amplifiers feature XLR and 1/4-inch TRS inputs, allowing seamless integration with a wide array of sound systems. Additionally, the CPS series employs efficient cooling systems, ensuring optimal performance without the risk of overheating even during prolonged usage.

Both models are designed with rugged construction, making them suitable for the rigors of touring and live events. They are equipped with rack-mountable chassis, allowing for easy installation in professional setups.

Overall, the SoundCraft CPS275 and CPS250 amplifiers exemplify the brand's commitment to delivering high-quality audio solutions. With their advanced technologies, protective features, and exceptional sound quality, they cater to a variety of audio applications, making them an excellent choice for professionals in the music and live sound industries. Whether powering large PA systems or smaller setups, these amplifiers are engineered to meet the demands of any audio environment with impressive accuracy and reliability.
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