Musical Fidelity B1 XI

Description

Amplification Performance and Technical Excellence
The Musical Fidelity B1 XI integrated amplifier delivers powerful and clean amplification, rated at 60 Watts per channel into 8 Ohms at 1% total harmonic distortion (THD), with 100 Watts per channel at 4 Ohms and peaks reaching 140 Watts at 2 Ohms. At an impressively low distortion of 0.09% THD across 20Hz to 20kHz, the B1 XI outputs 50 Watts into 8 Ohms and 80 Watts into 4 Ohms, ensuring dynamic and precise sound reproduction. It achieves a voltage rating of 21 Volts RMS within the full audible spectrum and a peak-to-peak voltage of 30 Volts with current peaks up to 8 Amps, paired with a damping factor of 30 for effective speaker control.

Input and Signal Integrity
The amplifier’s line inputs feature a total harmonic distortion plus noise (THD+N) typically below 0.02% over the full 20Hz to 20kHz range, with a signal-to-noise ratio exceeding 100 dB (A-weighted). Input impedance is set at 47 kOhms, with a frequency response extending from 10 Hz to 30 kHz (+0, -3 dB), maintaining audio fidelity for various source types.

Phono Stage Specifications
Equipped with a moving magnet (MM) phono stage optimized for cartridges delivering 1.5mV or greater, including high-output moving coil types, the phono section offers a nominal sensitivity of 5mV, gain of 42dB, and a frequency response of RIAA/IEC ±1dB from 20Hz to 20kHz. The phono input boasts a signal-to-noise ratio above 70 dB (A-weighted), input impedance of 47 kOhms, and ultra-low input capacitance below 100pF for accurate vinyl playback.

Connectivity and Controls
The B1 XI provides three pairs of line-level RCA inputs, MM phono input, optical and coaxial digital inputs supporting up to 24-bit/192kHz PCM audio, HDMI ARC input for AV integration, plus Bluetooth 5.1 wireless connectivity. Preamp outputs offer variable RCA line-level connections suitable for bi-amping or powered subwoofer setups. Speaker outputs accept 4mm banana plugs or binding posts for secure wire attachment. Analog volume is precisely controlled by a motor-driven potentiometer preserving signal integrity.

Power Supply and Mechanical Build
Factory set for mains voltages of 115/230 VAC at 50/60 Hz with an alternative 100 VAC option, the unit consumes a maximum of 280 Watts. The chassis weighs 7.2 kg unboxed and includes all-metal construction with dimensions of 430 mm width, 90 mm height including feet, and 324 mm depth inclusive of terminals, reflecting a robust build quality typical of Musical Fidelity.
 

What's in the Box:
Musical Fidelity B1 XI integrated amplifier
Power cable
User manual