Musical Fidelity M6xi Integrated Amplifier

Musical Fidelity It is an iconic British audio company that, throughout its history, has ranged from minimalist electronics to the most impressive high-end components. Amplifiers are something of a specialty for the company, ranging from the famous A1 integrated amplifier that amazed the world in the 1980s to the massive 1,000-watt Titan models of the 2000s. The brand is now part of the Audio Tuning (Pro-Ject) group, which has taken over from founder Anthony Michealson, ensuring the continuity of the company’s expertise without compromising its identity. The current catalog Musical Fidelity It offers a rich and diverse lineup, with multiple product lines categorized by price range and component type. Its models are also known for their durability. A new release like the M6xi integrated amplifier therefore does not go unnoticed. It is an integrated amplifier that has a lot to offer, featuring solid build quality and above-average performance despite its affordable price.

Musical Fidelity M6xi: What’s It Like?

The Musical Fidelity M6xi is a high-power integrated amplifier capable of delivering 230 watts per channel into 8 ohms and 390 watts into 4 ohms—a power output higher than the average for mid-to-high-end integrated amplifiers, which are typically found in higher price brackets. It updates its predecessor, the M6si—a model that enjoyed considerable success—gaining 10 watts of power, expanding digital input connectivity, and further refining its build quality.

The design is traditional and features a separation of circuit functions within a sturdy metal cabinet. The power stages are separate for the two channels, with the circuit boards mounted along the chassis’s wide, finned sides. This is essentially a dual-mono configuration—except for the single transformer—but it still features separate secondary windings.

This transformer is a toroidal type and appears to be well-sized and carefully crafted, finished with a black protective film beneath which a ring designed to contain the external electromagnetic flux is visible. This precaution is further enhanced by the metal shielding box that encloses it, representing an improvement over the previous M6si. There are five secondary windings, dedicated to separate power lines not only for the two power channels but also for the preamp section and auxiliary circuits. The standby power supply board is also located inside the same shielding enclosure, while the audio PCBs house the relevant power supply components. For example, the power modules and the preamp section feature dedicated rectifier bridges and filter capacitors. On the one hand, this ensures optimal separation between the sections and promotes low circuit impedances; on the other hand, however, one might worry about interference from AC voltage line leakage. The signal paths have been carefully routed, however, and the amplifier is truly very quiet.

There are no complaints about the choice of components, which are properly sized and of good quality. The power filtering section is adequate, consisting of four 4,700-microfarad electrolytic capacitors per channel. The active components consist of two pairs of complementary STD03N/STD03P transistors manufactured by Sanken. These are modern—and therefore fast—Darlington transistors which, like ON Semiconductor’s famous Thermal Trak transistors, incorporate temperature-compensating diodes within their packages.

The preamp and input board, which is naturally located next to the rear panel, is well-built. It uses red metal-film capacitors from Wima and features an NJW1112 input management chip from JRC (Japan Radio Company). The volume control is also an integrated circuit, the excellent PGA2320 from Burr-Brown/Texas Instruments. It is a digitally controlled analog attenuator where the audio signal is obviously not converted but is routed through a sequence of internal resistors and switches. The sequence of attenuation steps is decoded from the knob’s position and communicated to the chip via a standard digital protocol by the amplifier’s controller. This solution ensures low noise, precision, and perfect channel separation far beyond what is possible with even the best sliding-contact potentiometers.

The digital section is spread across two separate boards, stacked on top of the input board. The first module handles HDMI, while the second, larger one is the actual converter, based on a Texas Instruments chip. It features the PCM9211, a proven digital input interface, and a PCM1781—certainly not a latest-generation DAC, but nonetheless an effective delta-sigma converter.

The unit is “designed in England—built in Taiwan” and offers exceptional build quality at a competitive price. It’s commendable that, at a time when some brands are cutting costs by skimping a bit on materials—as seen with some plastic front panels even in the higher-end market segments—Musical Fidelity continues to use solid aluminum panels nearly two centimeters thick. The number of screws used to secure the top panel is also above average, as is the unit’s overall weight, which is close to twenty kilograms.

It’s also worth considering the packaging—a design element that has no direct bearing on performance but demonstrates the care with which the company showcases its product. The Musical Fidelity M6xi integrated amplifier arrives in multi-layered cardboard packaging, an effective safeguard against the “criminal carelessness” of many shipping carriers. Inside, you’ll find accessories for maintaining its appearance, such as white cotton gloves and a fingerprint-resistant cloth. The unit itself is then housed in a velvet pouch. Even the instructions are bound in a ring-bound booklet reminiscent of technical manuals for scientific instruments. In short, Musical Fidelity continues to “pamper” the customer, offering the satisfaction of a touch of luxury even in this price range.