Perreaux Prisma 350 Multiple Protection Systems, Earthing Earth Isolation Switch Highest

Multiple

Protection

Systems

Note:

Earthing

Earth

Isolation

Switch

Highest

Quality PCBs

and

Components

Bi-Wiring Made Easy

Soft-Start

Circuitry

Highly

Powered

The 350 is equipped with a number of protection systems, isolated from all signal carrying circuits via opto-couplers, to protect both itself and ancillary equipment.

DC Offset Protection

This system senses if any direct current (DC) is present at the 350 output terminals and disconnects the output to avoid potential speaker damage. DC may be present due to ancillary equipment feeding DC into the input or an amplifier fault.

Short-Circuit/Overdrive Protection

This system senses if there is a short circuit across the 350 output terminals and disconnects the output to avoid amplifier damage. It also senses if the 350 is being driven outside acceptable operational parameters. An example of this would be driving a 1Ω speaker at very high levels.

After the short circuit or overdrive source is removed, the 350 must be turned off then back on to reset and resume operation.

Thermal Protection

This system senses if the 350 is overheating and disconnects the output until a safe operating temperature is reached, at which time the unit will automatically resume normal operation.

Perreaux engineers pay particular attention to designing the product to ensure maximum separation between internal signal and power earths, only meeting at a central starred point.

The toggle switch on the rear of the 350 allows the internal circuitry to be isolated from the mains earth, whilst still maintaining an earth connection to the chassis. This ensures the potentially fatal practice of using an AC cord-set with no earth connection, to alleviate system hum, is not required.

Quality fibreglass PCBs, featuring heavy copper tracks and high-grade components, are used throughout the 350. This provides added stability under variable thermal or electrical loads and assures maximum signal integrity, separation and product life.

Dual pairs of binding posts per channel allow bi-wiring of speakers to be conducted easily.

The 350 utilises soft-start circuitry to protect the fuses and/or circuit breakers in your home’s mains power supply. Without this circuit, the huge inrush current required to charge the 60,000PF of power supply smoothing capacitance can blow the fuses or trip the circuit breakers.

Capable of continuously delivering 350WRMS into 8Ω (600WRMS into 4Ω), the 350 is highly powered. Utilising eight high current Toshiba MOSFETs per channel, the 350 handles even the most difficult loads with ease.

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