Musical Fidelity - M6xi - High-End Integrated Amplifier

The next evolution of Musical Fidelity's acclaimed M6 line. 220W per channel into 8Ω / 320W into 4Ω, fully discrete dual monoblock power amplifier with TITAN-derived circuitry, Burr-Brown stepped attenuator, upgraded MM/MC phono stage, HDMI eARC, USB-C 24/192, isolated USB-A streamer power output and RS232 control. Heroic aluminium construction. The M6xi is the definitive high-end integrated amplifier.

The Next Evolution of the M6 Line

The Musical Fidelity M6xi is the most advanced and capable integrated amplifier the company has ever produced in the M6 line. Building on the outstanding success of the M6si, the M6xi carries the same proven formula — massive power, uncompromising engineering, and true high-end sound — and elevates it with a comprehensively upgraded internal architecture, modern connectivity for today's systems, and refinements drawn directly from Musical Fidelity's legendary TITAN power amplifier.

The M6xi is not merely an update. It is a statement of where Musical Fidelity's engineering philosophy leads when given the freedom to push further.

Son of TITAN — Fully Discrete Dual Monoblock Power Amplifier

The M6xi's power amplifier stage is configured as two fully independent monoblock power amplifiers sharing a single chassis with a separate preamplifier. In practice, this is a preamplifier with two dedicated monoblock amplifiers — and every part of this architecture benefits from technology trickled down directly from the legendary 1kW TITAN power amplifier.

At its core lies a low-distortion Darlington output stage arranged in the classic Musical Fidelity configuration. This design eliminates crossover artefacts while maintaining extremely low residual distortion across the entire frequency range, preserving musical detail and tonal accuracy in a way that competing designs cannot. Two pairs of output devices per channel, combined with an oversized encapsulated toroidal transformer, deliver extraordinary headroom and current capability — 45 amps peak-to-peak, with peak power reaching 280W into 8Ω and 450W into 4Ω.

With 220 watts per channel into 8Ω and 320 watts into 4Ω under continuous conditions, the M6xi possesses the authority to drive the most demanding loudspeakers with complete composure — including through the low-impedance dips that expose lesser amplifiers. All power supplies remain purely analogue during operation, reducing high-frequency noise and minimising EMC-related interference throughout the signal path.

A new PCB layout — the result of meticulous engineering — minimises circuit imbalances that would otherwise require corrective feedback, allowing the amplifier to operate more naturally and transparently. The main transformer and power supply PCB are now encapsulated within a metal enclosure, dramatically reducing electromagnetic interference inside the chassis and benefiting every circuit in the amplifier.

Preamplifier — Precision at Every Level

The M6xi's preamplifier stage is a fully analogue, low-noise design engineered for absolute signal integrity across the entire dynamic range. Volume control is handled by a high-quality Burr-Brown stepped attenuator — a significant advantage over conventional potentiometer designs, offering more precise channel matching, perfectly balanced stereo imaging and consistent tonal accuracy at every listening level.

Whether at quiet background levels or full-scale output, the M6xi preserves microdetail and harmonic accuracy with total harmonic distortion of less than 0.007% and a signal-to-noise ratio exceeding 107dB A-weighted. The result is effortless clarity, stable imaging and uncompromised musical realism.

Upgraded MM/MC Phono Stage

Vinyl playback receives equal attention in the M6xi. The upgraded MM/MC phono stage features an improved PCB layout with enhanced isolation and shielding — a critical consideration given that phono circuits operate at amplification factors up to 1,000×, making them uniquely susceptible to electromagnetic interference. With the transformer and power supply PCB now encapsulated in a dedicated metal enclosure, the phono stage benefits directly, delivering lower noise, lower distortion and greater transparency than ever.

The result is a phono input capable of revealing the full warmth, depth and dynamic nuance of high-quality vinyl recordings, whether from a moving magnet or moving coil cartridge.

Modern Connectivity — Built for Today's Systems

The M6xi's connectivity suite has been comprehensively expanded to meet the demands of contemporary audio systems:

• HDMI eARC — single-cable connection to TVs and home theatre processors, bringing the M6xi's analogue power stages to bear on television and streaming audio
• USB-C input — high-resolution audio up to 24-bit/192kHz, with a meticulously optimised digital circuitry layout to minimise high-frequency interference within the chassis
• Optical and Coaxial digital inputs — versatile connectivity for a wide range of digital sources
• Isolated USB-A 5V/2A power output — a dedicated, ultra-clean power supply with its own separate transformer winding and linear power supply stage, allowing modern USB streamers to be powered directly from the M6xi with a meaningful performance improvement
• RS232 interface — for custom installation, professional integration and advanced system control
• Home Theatre Bypass (HT input) — bypasses the preamplifier stage entirely, allowing seamless integration with AV processors and enabling the M6xi to serve as a high-performance stereo power amplifier for left and right channels in a multichannel system
• Balanced XLR input — for connection to balanced sources
• 4× RCA line inputs — comprehensive analogue source connectivity
• MM/MC phono input — upgraded, with improved shielding and circuit optimisation
• Variable Pre-Out — for bi-amping with the M6sPRX or connection to active subwoofers
• Fixed Line Out — ideal for connection to a dedicated headphone amplifier

Digital boards are physically separated on their own PCBs with their own linear power supply, ensuring that no RF interference from digital sources compromises the analogue signal path.

Heroic Build Quality

The M6xi's mechanical construction is uncompromisingly rigid and solid in the finest Musical Fidelity tradition. The front and side panels are milled from massive extruded aluminium profiles, creating an enclosure that is effectively immune to environmental vibration. The massive aluminium chassis also acts as a Faraday cage — protecting the internal circuitry from external electromagnetic fields while simultaneously shielding the rest of your system from any fields generated by the M6xi itself.

This is not a cosmetic choice. It is a fundamental engineering decision that contributes directly to the M6xi's exceptional sonic performance.

New Remote Control

The M6xi introduces a significantly redesigned remote control — elegant, lightweight and perfectly weighted for comfortable everyday use. Thoughtfully colour-coded in Musical Fidelity's distinctive brand palette, it is designed for seamless universal compatibility across the M-line range, including amplifiers, CD players and DACs. One beautifully engineered controller. Complete command of your entire system.