M5si Stream | Streaming Music System

The M5si Stream is a sensational integrated amplifier. Now with a WiiM Pro as streaming add-on.

M5si Stream Front Panel
M5si Stream Rear Panel

M5si Stream - Overview

The M5si is a real high end amplifier. At 150wpc, with high current delivery, it will drive virtually any loudspeaker easily. It has inputs for phono (MM), 4 line inputs and USB ‘B’ up to 24bit 96 kHz.

Fully Discrete Power Amplifier

With very low distortion, outstanding noise ratio and an extremely flat frequency response, it is configured as two independent monoblocs with a separate preamp, but all mounted on one pcb. Its technical performance is about equal to the M6si. The M5si produces an extraordinary sweet clear lucid sound. Significantly it was developed after our amazing legendary Nu-Vista 800. Consequently some of the Nu-Vista 800’s subtle pcb layout solutions have found their way into the M5si. And in turn those solutions stem from our legendary TITAN power amp.

The Musical Fidelity Design-Philosophy

Further flexibility is provided by the M5si‘s carefully considered connectivity, which includes 4 line-level inputs, a switchable home-theatre throughput, a USB input, a high quality MM phono stage and trigger in & outputs. When you hear it we are sure you will understand the relationship between the two. The M5si projects a deep and wide stereo image with very extended bass and a crystalline top end without a trace of harshness.

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 M5si 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.

The M5si 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 inspired by TITAN and Nu-Vista 800
  • 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
  • 150W/8 Ohm & 270W/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 M5si 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 or high-output MC cartridges
  • 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


Read the AUDIO review.

M5si Stream - Specifications


  • Power output: 150 Watts per channel into 8 Ohms; 270W into 4 ohms; 512W peaks into 2 ohms
  • THD (+ noise): <0.010 % typical 20Hz - 20 kHz
  • Signal to Noise Ratio: >100dB ‘A’ - weighted
  • Frequency Response: +0, –0.1dB, 10Hz to 20 kHz


  • 4x Line Level RCA
  • 1x USB type ‘B’ connector - asynchronous data stream at up to 24-bit/96kHz
  • 1 x MM phono input
  • Trigger in

Phono Input

  • Sensitivity: 3mV nominal (MM)
  • Signal / noise ratio: >70dB ‘A’-weighted
  • Input impedance: 50k Ohms (MM)
  • Frequency response: RIAA/IEC ±0.5dB 20Hz-20kHz


  • Trigger out
  • Fixed, line level output
  • Variable, preamp output


  • Dimensions - WxHxD (mm): 440 x 100 x 405
  • Weight (unpacked / packed): 14.6 kg/ 18.8 kg

M5si Stream - Downloads

Product Information Sheet

M5si Stream Information Sheet (English)

M5si Stream Information Sheet