Perreaux Prisma 350 owner manual Special Design Features

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Special Design Features

Rugged Build Quality

Ultra Stiff Power Supply

Hybrid Class A/AB

MOSFET Output Stage

Mechanical strength has been a hallmark of Perreaux products since the company first started production back in 1974. The concept behind the physical design and construction is that each structural member should contribute to both rigidity and performance.

The 350 incorporates a massive custom designed, toroidal power transformer, employing unusually heavy gauge wire that reduces copper losses to a minimum. An electrostatic shield prevents AC line borne interference from entering the signal path. The power supply filter capacitors, totaling 60,000µF (30,000µF per channel), have exceptionally low inductance and internal resistance. They charge and discharge in response to load demand far more rapidly than conventional storage capacitors and are capable of delivering the instantaneous current required by the output stages, providing optimum dynamic range and transient response. The wiring from the power supplies to the output boards is designed for unimpeded transmission of the required current and voltage and utilizes heavy gauge, tinned copper wire cables. Since power supply leads radiate at signal frequencies, all wiring is carefully loomed to minimise this effect.

The bi-polar transistors used in the 350 are run in Class A mode. This avoids the crossover notch distortion and the resulting odd-order harmonics present, to some degree, in all other classes of operation. The devices used in the 350 output stage are MOSFETs, which with high quiescent current circuitry, are run in the equivalent of Class A to 10 watts. Beyond this point the output class is technically Class AB (hence the hybrid nomenclature), but with a major difference. The combination of MOSFET characteristics and their application in this circuitry, result in crossover distortion so minimal that it is virtually non- existent.

The 350 output stage takes full advantage of the unique qualities of MOSFET devices and in many ways they are superior to bi-polar transistors. A major advantage is their tendency to draw less current over a large section of the power bandwidth as their temperature rises (Negative Temperature Coefficient), hence self stabilising thermally, whereas bi-polar transistors draw more current as their temperature rises (Positive Temperature Coefficient) and protection circuits become mandatory to prevent thermal runaway and eventual self destruction. MOSFETs have the ability to swing fully across the amplifier’s internal DC voltage and are therefore true "rail-to-rail" devices. Using MOSFETs encourages the highest performance from the balance of the internal amplifier circuitry.

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Contents Prisma Page Introducing the Perreaux 350 Power Amplifier Ii Important Safety Instructions Page Table of Contents IiiUnpacking and Placement Ventilation Requirements Instant Install Congratulations Front Panel Functions Rear Panel Functions Fuse Rating Master Trigger Input Balanced Inputs Special Design Philosophies Minimalism in a Wider Context Special Design Features DC Offset Protection Maximising System Potential Watts is twice as loud as 35 Watts, not ten times as loud Power Mosfet Audio Applications Secondary Breakdown High Frequency Response Other Advantages Care and Maintenance Warranty Information Obtaining ServiceExtended Warranty Registration FormFaultfinding Your System Identifying Isolating Problems Loudspeakers Preamplifier Faultfinding Flowchart 13Specifications 600WRMS into 4SDimensions Voltage Gain 30.7dB Physical Dimensions Contact Details Installation Notes

Prisma 350 specifications

The Perreaux Prisma 350 is an innovative and sophisticated integrated amplifier designed to elevate the listening experience for audiophiles and music enthusiasts alike. Renowned for its robust construction and exceptional audio quality, the Prisma 350 stands out as a versatile piece of equipment in the world of high-fidelity sound systems.

One of the key features of the Prisma 350 is its impressive power output. With a strong performance of 175 watts per channel into 8 ohms, it is capable of driving a wide range of speakers, making it highly adaptable to various listening environments. This level of power ensures that music is delivered with clarity and authority, resulting in a rich and immersive listening experience.

The Prisma 350 utilizes advanced Class A/B amplification technology. This design offers the best of both worlds, delivering the warmth and detail often associated with Class A amplifiers while maintaining the efficiency and power of Class B designs. This combination allows the Prisma 350 to reproduce music with accuracy, ensuring that even the most subtle nuances in recordings are faithfully rendered.

In terms of connectivity, the Prisma 350 boasts a comprehensive array of input options. It includes multiple RCA, balanced XLR inputs, and a built-in phono stage for vinyl enthusiasts. Additionally, it features digital inputs such as USB, optical, and coaxial, ensuring seamless integration with modern digital sources. The inclusion of Bluetooth capability further enhances its versatility, allowing for effortless streaming from mobile devices.

Another noteworthy characteristic of the Prisma 350 is its user-friendly interface. The amplifier is equipped with a clear, intuitive display along with a well-designed remote control, making it easy to navigate settings and adjust sound preferences. The integrated DAC (digital-to-analog converter) elevates digital audio quality, ensuring that even high-resolution files are played back with precision.

Constructed with robust materials, the Perreaux Prisma 350 not only looks elegant but is also built to last. Its heat management system ensures optimal performance without overheating, providing peace of mind during extended listening sessions.

In summary, the Perreaux Prisma 350 is a high-performance amplifier that combines power, versatility, and advanced technology to create an exceptional audio experience. With its rich feature set, attention to detail, and superior build quality, the Prisma 350 is an excellent choice for those seeking to enhance their musical enjoyment at home.