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MUSICAL FIDELITY

www.musicaldelity.com

M8xi Integrated Amplier

Super Integrated Amplier

Design Background

In 1990, Musical Fidelity made

the rst ever Super Integra-

ted amplier: the A 1000. lt

received a rapturous welco-

me and, even today, second

hand, is selling at high prices.

The A1000 was the rst of a

long line of Super Integrated

Ampliers from Musical Fideli-

ty. Its children: the NuVista M

Tri Vista 300, kW500, M6/500i,

NuVista 800 and NuVista 600

all were equally enthusiasti-

cally welcomed to the audio-

phile world ..

The M8xi is the latest and the

best of the breed.

General Description

The M8xi is a separate pre-

amp with two monobloc po-

wer amps sharing a common

chassis. Each has its own heat

sink and separate transforrner.

Genuinely dual mono.

The preamp has its own se-

parate power supply and is

mounted close to the input

sockets.

Consequently, PCB tracks are

very short. This elegant idea

ensures that both channels

signals are ultra low impedan-

ce from the instant they get

into the amplier. This is a sig-

nicant detail.

Each channel has twelve big

bipolar transistors - 200 amps

peak to peak is easily availa-

ble.

The metalwork is high quality.

The front panel is a custom

made ne line extrusion of mil-

spec aluminium. The custom

made heat sinks have out-

standing dissipation charac-

teristic and nish.

The M8xi construction has the

feeling of solidity and quality.

Summary of content (4 pages)

PAGE 1
M8xi Integrated Amplifier Super Integrated Amplifier Design Background General Description In 1990, Musical Fidelity made the first ever Super Integrated amplifier: the A 1000. lt received a rapturous welcome and, even today, second hand, is selling at high prices. The A1000 was the first of a long line of Super Integrated Amplifiers from Musical Fidelity.
PAGE 2
New Circuitry Over the last 5 years our power amp circuitry has reached a high state of development. In our never ending quest for improving performance and customer value we have been looking for ways to improve our designs. One of the prime directives was to keep the low feedback configuration unchanged .. continue with low feedback! The problern was how to improve efficiency and performance without affecting the sound quality. If I say so myself, I think we have come up with a brilliant solution.
PAGE 3
Distortion The overwhelming majority of amplifier manufacturers only talk about distortion at 1 kHz. We believe that this is only a fraction of the story. From our perspective, an amplifier must have very low distortion from 20 Hz- 20 kHz and beyond. We believe that an amplifier‘s high frequency performance proves the total performance of the circuit and PCB layout. The M8xi distortion hardly changes from 10 kHz to 50 kHz. An outstanding achievement and validation of the circuit design and PCB layout.
PAGE 4
M8xi INTEGRATED AMPLIFIER SPECIFICATION Amplifier: • Power Output (20Hz - 20kHz): 550 Watts per channel into 8 Ohms (870W into 4 Ohms) Peak 1.6kW into 2 Ohms • Maximum output voltage: 67 Volts RMS, 20Hz to 20 kHz; onset of clipping (190 Volts peak-to-peak) • THD+N: <0.