Musical Fidelity M8x DAC

Musical Fidelity M8x DAC

M8x DAC continues Musical Fidelity's legacy of pioneering DAC technology, dating back to the early 90s when the company was among the first to build separate DACs to enhance CD player sound quality. Built on the same design principles as Musical Fidelity's acclaimed amplifiers, it uses 2x ES9038Q2M DAC chips in dual differential mode for a fully balanced, dual-mono design, supporting up to 768kHz PCM, DSD256 via DoP, and native DSD512 via USB, with full hardware MQA decoding on both USB and SPDIF inputs. A high-power, fully discrete and balanced headphone amplifier is built in, capable of driving demanding low-impedance headphones down to 8 ohms. As an authorized Musical Fidelity dealer in Toronto, Canada, Vinyl Sound can help you integrate this DAC into your digital and headphone setup.

Key Features

• 32-bit Hyperstream II DAC circuit, 2x ES9038Q2M chips in dual differential mode
• Discrete, fully balanced output stage — a major step up from the M6x DAC's IC-based output
• High-power, fully discrete and balanced headphone amplifier with 4-pin XLR balanced output
• Drives low-impedance headphones down to 8 ohms with ease
• 16-core XMOS and CPLD MAX II Altera processors
• Switchable advanced reclocking and upsampling
• 8 selectable digital filters for PCM, including an oversampling bypass mode
• Full hardware MQA decoding on USB and SPDIF inputs (new vs. the M6x DAC)
• Roon Tested
• Super Silent Power Transformer with discrete input power filtering and DC blocking
• 1x asynchronous USB (up to 768kHz), 1x coaxial, 3x optical SPDIF, 1x AES/EBU, 1x I2S (for Musical Fidelity CD players)
• 1x RCA, 1x balanced XLR output, switchable variable/fixed
• Trigger in/out
• No display — reduces electromagnetic interference and keeps the design timeless
• Front, side, and top panels milled from extruded aluminium profiles

Dual ES9038Q2M DAC Architecture

M8x DAC uses 2x ES9038Q2M chips in dual differential mode for a pristine dual-mono design, supporting up to 768kHz PCM files, DSD256 via DoP, and native DSD512 via USB. SPDIF inputs have also been improved, now supporting MQA (up to 384kHz) and DSD (DoP 64). A low-noise, low-dropout regulator with dual-regulator architecture, combined with a Time Domain Jitter Eliminator, achieves total correlated jitter below 100 femtoseconds — outperforming many respected standalone audiophile clock generators. 16-core XMOS and CPLD MAX II Altera processors handle upsampling, reclocking, digital filters, and MQA processing, which is now available on both USB and SPDIF inputs, unlike the prior M6x DAC.

Upsampling, Reclocking, and Oversampling Bypass

Upsampling and reclocking can be individually switched on or off for PCM signals, while DSD and MQA use their own format-specific settings and filters. For PCM, M8x DAC offers 8 selectable digital filters. Filter 8 activates an oversampling bypass mode — the default setting out of the box — which disables the DAC's oversampling FIR filters and upsamples source data to 352.8kHz or 384kHz. At ultra-high sample rates of 705.6kHz and 768kHz, source data enters the DAC block directly, turning off all remaining filtering. Because the oversampling filter is the largest single digital block on the ESS DAC chip by silicon area, powering it down reduces on-chip PSU/ground noise and lowers signal-correlated clock modulation on the DAC die.

Discrete, Fully Balanced Circuitry

M8x DAC's output stage is fully discrete and fully balanced, a major evolution from the M6x DAC's IC-based output stage. In a true balanced design, the + and - signal paths for each channel are processed independently rather than combined early (as in a "pseudo-balanced" design), doubling the amplifier sections needed but allowing common-mode noise to be subtracted out along the way. Musical Fidelity states this benefits both sound quality and long-term repairability, since discrete components remain serviceable long after specific ICs go out of production.

High-Power Balanced Headphone Amplifier

The built-in headphone amplifier uses a fully discrete design with DC-coupled power operational amplifiers built from transistors, rather than the chip-based designs found in most standalone headphone amps. It offers a 6.3mm jack for unbalanced headphones and a 4-pin XLR output for balanced headphones. The fully differential balanced design delivers 3.9W into 8 ohms (versus 2W unbalanced), with short peaks in excess of 10W handled with ease, and runs in Class A up to full power for headphones rated 30 ohms or higher. Output transistors are also chosen to comfortably drive low-impedance headphones down to 8 ohms.

Power Supply and Build

M8x DAC uses a Super Silent Power Transformer alongside a sizable, separate discrete power filtering and DC-blocking PCB, industrial-grade power sockets with EMI filtering and DC blocking, and an encapsulated toroidal transformer with low core saturation purpose-built for digital audio and headphone applications. Digital and analogue power supplies are carefully separated, and each output and headphone amp stage has its own DC servo, powered by two symmetrical low-noise power supplies (one per channel). Front, side, and top panels are milled from extruded aluminium profiles, and the case's mass acts as a Faraday cage protecting the sensitive internals from external electromagnetic fields — the deliberate absence of a front display further supports this shielding.

Reviews

"However you pair it, the M8x DAC is superb. Offering a sonic performance that majors on cohesion and delicate detail, it never 'forgets' that enjoying music is about emotion, not analysis." — Jamie Biesemans, Hi-Fi News, December 2026

"The M8x DAC definitely goes a step further. This latest addition from Musical Fidelity is extremely versatile, multipurpose and superbly organised. It has set a new standard for audiophile DACs." — John van der Veer, HVT, October 2025

"Transparency, tangibility, fluidity and sophistication. And also, of course, organic warmth and excellent analyticality. The sound is very tangible and dynamic. Breathable, fast and multi-layered. With noticeable reverberations, resonances and decay." — Ludwik Hegel, September 2025

Technical Specifications

Frequently Asked Questions

Does this decode MQA?
Yes, full hardware MQA decoding is supported on both USB and SPDIF inputs, an improvement over the prior M6x DAC, which only supported MQA on limited inputs.

Can this drive demanding headphones?
Yes, the fully discrete, balanced headphone amp delivers 3.9W into 8 ohms via its 4-pin XLR balanced output, running in Class A up to full power for headphones rated 30 ohms or higher, and is designed to comfortably drive low-impedance headphones down to 8 ohms.

Is this Roon compatible?
Yes, M8x DAC is Roon Tested.