Musical Fidelity B1xi Integrated Amplifier
Class A/B integrated amplifier with MM phono, DAC, HDMI ARC, Bluetooth — elegant design meets serious performance.
Product Overview
The Musical Fidelity B1xi combines classic amplifier philosophy with modern connectivity.
It delivers 60 W per channel into 8 Ω (100 W into 4 Ω, peaks up to 140 W into 2 Ω) using a fully discrete Class A/B output stage. :contentReference[oaicite:0]{index=0}
A dedicated low-noise preamp section is backed by a motorized analog volume control, and the MM phono stage is tuned for musical detail with minimal coloration. :contentReference[oaicite:1]{index=1}
On the digital side, it features separate linear PSUs for analog and digital boards, coaxial and optical inputs (up to 24-bit/192 kHz), HDMI ARC, and Bluetooth 5.1. :contentReference[oaicite:2]{index=2}
A 5 V USB-C output can power an external streaming device. :contentReference[oaicite:3]{index=3}
That said, B1xi deliberately omits built-in WiFi or full streaming features to preserve long-term reliability and sonic purity. :contentReference[oaicite:4]{index=4}
Key Features
- 60 W/8 Ω, 100 W/4 Ω, up to 140 W peak into 2 Ω, Class A/B output stage :contentReference[oaicite:5]{index=5}
- Discrete analog preamp with motorized analog volume control for smooth gain stages :contentReference[oaicite:6]{index=6}
- MM phono stage: high gain, low noise, tuned for neutrality and clarity :contentReference[oaicite:7]{index=7}
- Digital section: Coaxial, Optical (24/192 PCM), HDMI ARC, Bluetooth 5.1 :contentReference[oaicite:8]{index=8}
- Linear power supplies for analog and digital circuits (PSU separation) :contentReference[oaicite:9]{index=9}
- 5 V USB-C output to power external streamer or DAC without noise interference :contentReference[oaicite:10]{index=10}
- Robust all-metal chassis, machined front panel, solid mechanical design :contentReference[oaicite:11]{index=11}
- No WiFi or screen — design choice to minimize compromises and prolong operational lifespan :contentReference[oaicite:12]{index=12}
Technical Specifications
| Amplifier Type | Fully discrete Class A/B |
|---|---|
| Output Power (8 Ω, both channels) | 60 W / channel :contentReference[oaicite:13]{index=13} |
| Output Power (4 Ω) | 100 W / channel :contentReference[oaicite:14]{index=14} |
| Peak Output (2 Ω) | 140 W :contentReference[oaicite:15]{index=15} |
| THD (typical) | 0.02 % (line inputs, 20 Hz–20 kHz) :contentReference[oaicite:16]{index=16} |
| Signal / Noise Ratio (Line) | > 100 dB A-weighted :contentReference[oaicite:17]{index=17} |
| Input Impedance (Line) | 47 kΩ :contentReference[oaicite:18]{index=18} |
| Phono Sensitivity | 5 mV (MM) :contentReference[oaicite:19]{index=19} |
| Phono S/N Ratio | > 70 dB A-weighted :contentReference[oaicite:20]{index=20} |
| Phono Input Impedance / Capacitance | 47 kΩ / < 100 pF :contentReference[oaicite:21]{index=21} |
| Frequency Response (Line) | +0 / –3 dB, 10 Hz – 30 kHz :contentReference[oaicite:22]{index=22} |
| DAC & Digital Inputs | Coaxial, Optical, HDMI ARC (24/192 PCM), Bluetooth 5.1 :contentReference[oaicite:23]{index=23} |
| Pre-out | Variable RCA pre-out for subwoofer or bi-amping :contentReference[oaicite:24]{index=24} |
| USB-C Output | 5 V output for powering external streamer / DAC :contentReference[oaicite:25]{index=25} |
| Mains Consumption (Max) | 280 W :contentReference[oaicite:26]{index=26} |
| Dimensions (W × H × D) | 430 × 90 × 324 mm :contentReference[oaicite:27]{index=27} |
| Weight (Unit) | 7.2 kg :contentReference[oaicite:28]{index=28} |
