Musical Fidelity

M6si Stream | Streaming Music System

The M6si Stream is a high-end amplifier, now with a WiiM Pro as streaming add-on.

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Product overview
Design + build
Specifications
Downloads

M6si Stream - Overview

At Musical Fidelity we think of the M6si as being a destination product. The M6si offers such excellent performance, facilities and power that unless you are seeking the most exotic high-end sound quality you would never need another amplifier. We believe it’s that good. The M6si has 220wpc. It has very low distortion, outstanding noise ratio and extremely flat frequency response. Its inputs are phono (MM/MC), 4 line level, 1 balanced XLR and 1 USB ‘B’ up to 24bit 96kHz asynchronous.

Fully Discrete Power Amplifier - Son of TITAN

Internally, the M6si is configured as 2 independent monobloc power amps with a separate pre amp. It is, in fact, a pre amp with 2 monobloc power amps that just happen to share the same casework. It features technology trickled down from our legendary 1kW TITAN power amp. And the M6 combination of high power, high current and extraordinary stability means that it can drive any loudspeaker with ease.

The Musical Fidelity Design-Philosophy

The M6si distills the true Musical Fidelity high-end expertise and design principles down into an unbeatable package in this price point. In use it is hard to hear any practical difference between the M6si and other much more expensive amplifiers. In proper blind listening comparisons, the M6si performs incredibly well. If we sound rather enthusiastic it’s because we are.

We love the M6si and hope that you do too.

Musical Fidelity NOW streams

We’ve seen a surge in offerings from HiFi companies with all-in-one solutions, sometimes with big displays on top. Unfortunately, such developments mean that sound quality suffers. At Musical Fidelity, we acknowledge that any WiFi or BT circuitry generates a substantial amount of RF pollution and distorts analogue amp circuitry when incorporated into integrated, one-box solutions.

Musical Fidelity stands for sound quality and robust design that lasts for decades

We INVEST our money and resources in top-tier hardware and the pursuit of optimal music reproduction.

Robust mechanics - Discrete circuits - Huge transformers - Class A/B amps.
No HF and RF distortion.

We aim to have the best hardware and sound quality in every price range and make true high-end affordable.

We are partnering with one of the best STREAMING SPECIALISTS - the US Californian high-tech company LINKPLAY.

The M6si Stream includes a free WiiM Pro

The separate box and separate power supply ensure that we reduce RF and HF radiation and we can keep our analog amplifier technology as good as it is. LINKPLAY offers state-of-the-art technology, seamlessly compatible with any contemporary streaming service on the market, all navigable through an INTUITIVE and user-friendly APP. Moreover, their consistent maintenance and software updates ensure an optimal user experience.

M6si Stream In Brief

Musical Fidelity NOW streams

WiiM Pro adds modern streaming
Streamlined and easy setup
Countless streaming services and options
Best of both worlds:
Classic analogue high-end amplifier
Modern streaming in a separate box

Amplifier

High-end circuitry from our TITAN amplifier
Fully discrete transistor based Class A/B power amp design
Two independent monoblocs with a separate preamp
Drives power hungry speakers with ease and gracefully manages low impedance dips
220W/8 Ohm & 380W/4 Ohm output power
Extreme power reserves for proper peak power delivery and wide dynamic range
HT-input: bypassed preamp-stage allows connecting home-theater processors to use your M6si as ultimate L/R channel amp

Preamplifier

Low noise design for best THD and signal integrity at low as well as high levels
High quality Burr-Brown stepped attenuator for better channel matching than conventional potentiometer designs
Pre Out for bi-amping with M6sPRX or active subwoofer connection
USB input with meticulously careful digital circtuitry layout to minimize HF interference
Phono input for turntables with MM and MC cartrdiges

Mechanical Construction

Uncompromising metal work in typical Musical Fidelity tradtion
Heavy front, side and top panels milled from extruded aluminium profiles
Clean, stunning and indestructable metal exterior protects against electromagnetical interference

Reviews

Read the Stereoplay review.

M6si Stream - Design and Build

We felt that the original M6i’s package size, power and price were spot on. What was needed was the addition of extra input facilities and, if possible, an all round improvement of technical performance. By the way, despite endless component price rises during the M6i’s life, we didn’t alter its selling price. This made our final requirement even harder; the M6si should not be significantly more expensive than the outgoing model.

First we determined to use Musical Fidelity’s exclusive SMD layout techniques. This reduced the size of the circuit’s footprint and gave us greatly increased flexibility with internal layout. Consequently the new M6si is configured as a pre amp with two completely separate and independent monobloc power amps. The M6si is a proper pre amp with its own separate regulated power supply and discrete monobloc power amps, sharing same casework. This is a big change from the outgoing M6i. The M6si’s technical performance is a significant advance on the old model.

Performance

The M6si performs immaculately. Because of its pre amp with two monobloc power amp configuration both channels perform virtually identically, just what you would expect from a pre amp with separate power amps and not what you would expect from a normal integrated amplifier. The M6si is a cut above everything else.

Distortion is very low at less than 0.005%. More tellingly, HF distortion is incredibly low. At 10 kHz about 0.006% and at 20 kHz an astonishing 0.007%.

The vast majority of amplifiers suffer huge increases in distortion as you go up in frequency. The M6si’s meticulous PCB and circuit design means that HF performance is virtually identical to the LF performance. This is significant for sound quality.

Channel separation is remarkable, and remarkably consistent. Most amplifiers (integrated or pre/power) have dramatically worsening cross talk with increasing frequency. The M6si cross talk is outstanding and even at 20 kHz it is better than 82dB.

The phono stage is also special. It has very accurate RIAA, within ± 0.5dB from 20 Hz to 20 kHz. Also it maintains its accuracy right out to 50 kHz. The MM noise ratio is an outstanding 93dB down whilst the MC stage is, perhaps even more amazingly, about 87dB down. The phono stage distortion is a very low 0.01%. All in all the M6si’s phono stage is exceptional.

USB Input

The 24 bit 96 kHz asynchronous USB input uses exactly the same circuitry and technology as our highly regarded V-Links and other top quality computer interfaces. Jitter is virtually eliminated. Noise is incredibly low and distortion virtually

non-existent. The M6si’s USB input is capable of dredging the finest details from the computer source.

M6si Stream - Specifications

Amplifier

Power output: 220 Watts per channel into 8 Ohms; 380W into 4 ohms; 750W peaks into 2 ohms
THD (+ noise): <0.007 % typical 20Hz - 20 kHz
Signal to Noise Ratio: >107dB ‘A’ - weighted
Frequency Response: +0, –0.1dB, 10Hz to 20 kHz