B1xi | Integrated Amplifier

The B1xi is a Integrated Amplifier making High-End Musical Fidelity Philosophy Even More Affordable.

The B1xi integrated amplifier channels Musical Fidelity’s renowned amplifier expertise into a versatile, high-performance package. Driven by the design principles of our flagship models, the B1xi delivers 100W per channel into 4 ohms through a refined Class A/B circuit, offering a rich and dynamic tube like sound.

Designed for today’s diverse listening needs, it features a comprehensive input selection: MM phono stage, coaxial and optical digital inputs, ARC, Bluetooth, and three RCA line inputs—all engineered for seamless source integration. A variable RCA pre-out supports subwoofer connection or bi-amping, while a 5V USB-C output provides convenient and clean high-quality power for an external streamer. Encased in robust all-metal construction with solid metal controls and a solid aluminum front panel, the B1xi offers the sonic and build quality Musical Fidelity is known for, delivering a pure, uncompromised audio experience for discerning music lovers.

Pure Class A/B Excellence with True High-End Audiophile Design

Transistor amps in Class A/B are best after tubes and Class A amps. Musical Fidelity is tube like sound and power. The B1xi delivers 60 watts per channel into 8 ohms, 100 watts into 4 ohms and 140W peaks into 2 ohms. It won’t struggle to drive a wide range of speakers, even power-hungry models.

Discrete power and toroidal transformer

The fully discrete Class A/B power amp, complemented by its dedicated power supply and generously proportioned toroidal transformer, guarantees reserves for proper peak delivery and a wide dynamic range. Power hungry and difficult speakers are driven with ease. Low impedance dips are managed gracefully and the judiciously rated output devices won‘t faulter under any load.

Low noise preamp and phono stage

The preamp section features its own dedicated linear power supply—a rarity in integrated designs. This separation ensures ultra-low noise and excellent channel separation, rivaling high-end pre/power separates. Volume control is handled via a motor-driven analogue potentiometer, preserving signal purity—unlike many modern digital volume controls that compromise fidelity due to a loss in signal resolution. Vinyl lovers will appreciate the B1xi’s exceptionally low-noise, high-gain phono stage. Carefully tuned for musicality and detail, it brings out the best in your MM cartridges without adding coloration or distortion.

Separate digital boards

Digital and analogue hardware needs to be carefully separated from each other. Even the smallest amount of RF interference is known to cause trouble for analogue amplifier stages. Therefore, the digital and ARC boards are physically separated on their own PCBs and have their own linear power supply.

Drawing from our decade long experience in designing DACs (recently with our ground-breaking Nu-Vista DAC and M8x DAC), the B1xi uses a carefully trimmed DAC design using the superb ESS9018 chip. The digital coaxial and optical inputs accept high-resolution sample rates up to 24bit and 192kHz and the HDMI ARC input allows your home theatre to be brought to life and properly invigorated by the powerful B1xi analogue amp stages.

Uncompromisingly heavy mechanical design

The inclusion of high-end elements such as the robust metal controls, extruded aluminium front panel, and a chassis crafted entirely from metal, the B1xi occupies an enviable position for discerning audiophiles seeking an unadulterated high-end amplifier.

No WiFi on Purpose

The B1xi remains committed to sound quality instead of WiFi, a display and an App. There is NO WiFi streaming on purpose. We’ve seen a surge in offerings from HiFi companies with all-in-one solutions and unfortunately, such developments are HUGLY EXPENSIVE and on top very maintenance heavy.

Consequently, manufactures started to save the money somewhere: Cheap plastic cabinets, low-cost digital amplifiers, low-cost power supplies. 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. This means: Robust mechanics - Discrete circuits - Huge transformers - Class A/B amps. Fast moving streaming technology is best kept separate and therefore will not negatively impact the lifecycle of the B1xi. For that reason, the B1xi features a high-quality isolated USB C 5V power output for your favorite modern streamer – effectively also doubling as a power supply upgrade for it.

The Audiophile Truth

Any RF frequencies are influencing the performance of the analogue amplifier. Consequently, our design team, headed by chief technical director Simon Quarry:

• took one year to improve the layout of the circuitry and match the boards in relation to the transformer
• carefully selected components for long-term availability and reliability, to avoid any change which would cause a redesign of the product
• RF shielding and board placement to avoid interference with analog stages

The B1xi achieves price/performance like never before for Musical Fidelity. With carefully selected components, precisely tuned circuitry layout and years and years of research and development the B1xi stays true to the Musical Fidelity philosophy and makes high-end affordable like never before.

The B1xi In Brief

Amplifier

• Fully discrete transistor based Class A/B power amp design in Musical Fidelity tradition
• Drives power hungry speakers with ease
• 60W/8 Ohm, 100W/4 Ohm & 140W/2 Ohm output power
• Power reserves for proper peak power delivery and wide dynamic range
• Pure sound quality instead of WiFi, display and App
• No WiFi, display and App on purpose: Instead, we invest in components, which decide the sound quality

Preamplifier

• Low noise design for best THD and signal integrity at low as well as high levels
• High quality motor-driven analogue potentiometer
• Pre out for bi-amping or active subwoofer connection
• MM phono stage

Digital

• Separate digital and ARC boards with own linear PSU
• Up to 24bit/192kHz Stereo PCM: 1x Coaxial, 1x optical, 1x ARC inputs
• Bluetooth 5.1 input

Power Supply

• Generously rated toroidal transformer
• Independent power supplies for preamp, poweramp and digital part
• Output devices, and power supply generously rated to provide peaks even into difficult to drive speakers
• 5V USB C power output to power many new modern external streamers

Mechanical Construction

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

Reviews

"Retaining the original’s Class AB topology, the new B1xi integrated amplifier is a modern interpretation of the 1980s icon"

EISA 08/2025

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FLOORSTANDING SPEAKER – BOREA BR08

The floorstander BR08, inspired by the iconic Antal speaker, was the reference model throughout the design of the Borea range. Elegant three-way floorstander with 4 transducers, it is one of the most appreciated high-fidelity models.

It incorporates a new 25mm EFS silk dome tweeter; a new 16cm midrange with a brand-new profile, based on the research on the natural cellulose paper used before in the Esprit Ez; and two new 16cm bass drivers in fiberglass.

Its three-way configuration diffuses all frequencies with no interference between the transducers, producing precise voices and instruments.

This floorstander will fit perfectly in rooms ranging from 20 to 40m2.

EFS TWEETER

A DIFFUSION THROUGHOUT THE ROOM

The tweeter of the Borea range is equipped with a next-generation system called EFS* (Efficient Flow System).

It is based on the association of a 25mm silk dome, known for its neutrality, with a phase plug developed specifically to homogenize high-frequency diffusion. This system significantly reduces the directivity regardless of your listening location in the room.

The dome is placed inside the partial horn loading, reducing reflections and allowing a clear reproduction of the high frequencies. This transducer is powered by a neodymium motor generating high magnetic power in a compact size. It is coupled to a cooling system, ensuring a better power handling.

MIDRANGE IN NATURAL CELLULOSE

A UNIQUE TONALITY

The Borea range, inheritor of the Esprit Ez technological innovations, also incorporates a midrange driver with a membrane made out of 100% natural cellulose paper, receiving no surface treatment. This paper membrane, unique to TRIANGLE, avoids any coloration of the intermediate frequencies, and transposes the voices with stunning realism and tonality.

In an ongoing pursuit of excellence, the profile of the cone was also redesigned to improve the rigidity and now provides an extended frequency response.

On the three-way floorstander, the midrange driver incorporates a small pleat peripheral short-travel suspension, which Triangle is known for. Very rigid and perfectly adapted to the driver with short travel suspension, it allows a perfect control of the movement of the moving elements, thus ensuring natural-sounding vocals.

PUNCHING, POWERFUL AND PRECISE LOW FREQUENCIES

The mission of TRIANGLE’s engineers is to deliver a rich and dynamic sound in the low frequencies, emphasising the pace without ever distorting the music. Controlled low frequencies is an ongoing quest. Living up to its reputation, TRIANGLE focuses on fast and precise drivers, with large engines, all housed in optimized cabinets. The impact disappears as quickly as it has arrived, for a perfectly controlled rhythmic reproduction.

To achieve this, TRIANGLE has opted for membranes in fiberglass with an excellent vibratory behavior. Their rigidity enables to strongly reproduce each impact while leaving space for the vocal range, thus keeping an airy sound.

 REVIEWS

"This one of those loudspeakers that - beyond all the audiophile sensibilities - is fun to play..."- July 2020

 READ THE REVIEW

Amplifier

Power Output (20Hz - 20kHz):

550 Watts per channel into 8 Ohms (870W into 4 Ohms); Peak 1.6kW into 2 Ohms

Maximum output voltage:

67 Volts RMS, 20Hz to 20 kHz; onset of clipping (190 Volts peak-to-peak)

THD+N:

<0.004% typical, 20Hz to 20 kHz (XLR)

Signal/noise ratio:

> 86dB ‚A‘-weighted (XLR)

Input impedance:

25KΩ (RCA), 50KΩ (XLR)

Frequency response:

+0, –1dB, 10Hz to 100 kHz

Maximum peak output current:

105 Amps

Damping factor:

150

Output devices:

3+3 pairs (bridged arrangement) per channel

Inputs (analogue)

4 pairs line level RCA connectors

2 pairs line level XLR (balanced) connectors

Inputs (digital)

2x Coax S/PDIF up to 24 bit 192kHz

2x Optical S/PDIF up to 24 bit 96kHz

1x USB B Asynchronous USB up to 24 bit 192kHz

Outputs (analogue)

1 pair line level RCA fixed

1 pair pre-out RCA variable

1 pair line level XLR variable

Outputs (digital)

1x Coax S/PDIF up to 24 bit 192kHz

1x Optical S/PDIF up to 24 bit 96kHz

General

Dimensions (WxHxD):

485 x 185 x 510mm

Max. Consumption:

2000Watts

User Reviews

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