Musical Fidelity B1XI B1-XI B1 XI 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 DesignTransistor 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 transformerThe 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 stageThe 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 boardsDigital 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.



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