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Perreaux Prisma 750 Monoblock Power Amplifier

SKU: Prisma-750

Made in New Zealand


The Prisma Series 750 is a high quality, reference, 750W monoblock hifi audio power amplifier, incorporating true-balanced circuit topology and custom designed toroid power supply.


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$9,995.00

Product Description

Details

The Prisma Series 750 is a high quality, reference, 750W monoblock hifi audio power amplifier, incorporating true-balanced circuit topology and custom designed toroid power supply.

General Features

Rugged Build Quality

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.

Ultra Stiff Power Supply

The 750 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 60,000uF, 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.

Hybrid Class-A/AB

The bi-polar transistors used in the 750 are operatin in Class-A. 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 750 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.

Bi-Wiring Made Easy

2 pairs of binding posts make bi-wiring speakers as simple as "A-B-C".

MOSFET Output Stage

The 750 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.

Multiple Protection Systems

The 750 incorporates a full range of protection circuits, isolated from all signal carrying circuits via opto-couplers. However, these circuits are aimed at ensuring an extremely high safety margin for these high-powered products rather than as a mandatory addition to correct for poor or overloaded circuit topologies.

Soft Start

The 750 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 60,000uF of power supply capacitance, would blow the fuses or trip the circuit breakers.

Earthing

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

Highest Quality PCBs and Components

Quality fiberglass PCBs, featuring heavy copper tracks and high quality audiophile grade components, are used throughout the 750.

User Controls

Balanced/Unbalanced Input Select
Rear Mounted Power Switch
Earth Isolation Switch

I/O Compliment

1 Unbalanced Input (RCA)
1 Balanced Input (XLR)
2 pairs Speaker Binding Posts
2 Remote Trigger Inputs (5VDC)

Specifications

Continuous Power Ouput: 750Wrms into 8Ω
  1300Wrms into 4Ω
Total Harmonic Distortion (THD+N):  
  Typically 0.008% @ 1kHz into 8Ω
  20Hz to 20kHz <0.04% into 8Ω
Frequency Response: 20Hz to 25kHz, ±0.25dB
Signal to Noise Ratio  
  Rated Output (unweighted): 100dB
Dynamic Headroom (rated with music): >1.1dB
Maximum Current Output: 160A
Damping Factor: >700 @ 1kHz into 8Ω
Input Impedance:  
  Unbalanced 22kΩ
  Balanced 3.3kΩ
Input Sensitivity:  
  Unbalanced 1.50Vrms
  Balanced ±0.77Vrms
Dimensions:
  Width
  Height
  Depth

430mm (16.9")
186mm (7.3")
497mm (19.6")
Weight: 31.0kg (68.3lb)

Resources

Why buy from us?

Why buy from us?

Rapallo is an independently owned New Zealand company and with more than 15 years experience, we offer you both technical expertise and superior service.

Rapallo is fully authorized to sell products by all of the manufacturers listed on our website and in our store. In most cases we are more than a reseller, we are a direct dealer who also receives training and where possible we personally test products we sell.

Authorized dealers like us offer peace of mind. Rapallo

  • meets manufacturer's standards, from sales to service, in order to receive authorized status.
  • often receives training directly from manufacturer representatives and shares that expertise with you.
  • provides  support for all the products they sell.
  • ensures that manufacturer warranties will be honoured.
  • buys directly from big brand manufacturers and guarantee you buy NZ new, (no grey imports or parallel imports).

The Internet is an incredibly convenient information source and a wonderful way to find savings on the products you want. Protect yourself online by buying from authorized dealers, with genuine feedback and reputations.

A price too good to be true, usually is.
If you've ever searched for a product on a shopping engine (such as Priceme/Pricespy) you may have asked yourself, "Why are some stores charging so much less than other stores?"

Our customers often share these stories with us, so we thought we would share a few with you, in hopes that you don't fall prey to any of these unscrupulous sales tactics.

  • Goods may be grey market/parallel imported. They may state that the product includes the manufacturer warranty, but not tell you that the warranty is valid only in Europe, Japan, or South America, and NOT in NZ.
  • You may be asked to buy an expensive extended warranty. In many cases if you do not purchase the warranty, your purchase will be denied. (The product is now out of stock, your card does not go through, etc.)
  • Included parts may be sold to you separately. Some resellers will open boxes and charge extra for parts that are normally included by the manufacturer.
  • Hidden charges which don't show up until your credit card statement arrives, these charges only show up when your credit card statement is sent to you.
  • When something goes wrong, faulty, late delivery, doesn’t matter how many times you try to email, they don’t get back.
  • There are so many scamming online sellers today, “buyer beware” protect yourself!

Think you have a better price? Call us for the best deal.

12 months interest free over $1,000 or 18 months interest free over $2,000 finance available. Apply here.

Call us 09 2744515

Concerned About Fraud?

The internet has become a more popular source for online shopping, regrettably we have seen more and more instances of fraud affecting online shoppers. Companies trading under many  different names, loading warranties and charging for them as extras when often they are included from the manufacturer. Parallel imports or personal imports where the NZ supplier refuses to repair when things go wrong is often alarming to the unsuspecting purchaser. Inflated freight charges, customs and GST at the border are often forgotten as a buyer is tempted by a lower price. Constantly we hear all these stories, once bitten it’s all to late looking for that refund or replacement. The stories are outrageous at times, customers from Trademe and ebay with no place to turn, time consuming and very frustrating….

So how do you protect yourself from online fraud?

  • Buy from an authorized reseller. If you are at all suspicious, contact the manufacturer directly and ask if a company is authorized to sell their products.
  • Make sure you get a company invoice with GST clearly marked.
  • Make sure you buy from someone who has a phone number and an address on their website, not a P.O.Box number
  • Read customer feedback, you can usually tell if it's genuine or not.

We hope that you will become our next happy customer. And we promise to offer you superior service before, during and after your purchase.