Rupert Neve Designs Master Bus Converter (MBC)

Precision Conversion Meets Iconic Analogue Warmth

The Rupert Neve Designs Master Bus Converter (MBC) represents the ultimate bridge between analogue richness and digital precision. Designed for mixing and mastering engineers, high-end tracking studios, broadcast facilities, and live FOH engineers, this 1RU master bus processor delivers reference-grade 24-bit/192 kHz analogue-to-digital conversion paired with a fully analogue Class-A limiter circuit. Whether capturing the final mix bus, printing master files, or tracking critical acoustic instruments, the MBC provides unprecedented sonic versatility, ensuring your digital captures retain three-dimensional depth, clarity, and punch.

Dual-Path Analogue Topology: Pure Transparency or Iconic Character
The MBC features a revolutionary dual-path analogue drive stage that lets you choose the exact sonic signature required for your project. When pristine accuracy and maximum detail are paramount, the Class-A transformerless path delivers transparent reproduction with exceptional low-frequency punch and extended high-frequency clarity. Alternatively, engaging the custom-designed inter-stage audio transformer path infuses your signal with the classic weight, girth, and harmonic authority of Rupert Neve's legendary console designs.

Variable Silk Texture: Tailor Harmonic Depth and Colour
Integrated directly into the transformer path is Rupert Neve Designs' acclaimed Silk harmonic saturation circuit. Featuring selectable Red and Blue Silk modes controlled by a 31-detent Texture potentiometer, the MBC allows precise tone sculpting prior to conversion. Red Silk accentuates mid and high-frequency harmonics to add presence, sparkle, and air, while Blue Silk enhances low-frequency harmonics to add warmth and body. From subtle analogue sheen to rich console-style saturation, the MBC shapes harmonic content effortlessly.

Active Compound Release Limiter & Mastering Clock: Dynamics with Absolute Control
Equipped with a Class-A line amplifier providing up to +20 dB of clean gain, the MBC's Compound Active Release analogue limiter offers lightning-fast peak control (0.5 ms attack, fixed 10:1 ratio) without destroying mix dynamics or introducing digital artefacts. A sweepable 12 dB/octave sidechain high-pass filter (20 Hz to 250 Hz) prevents heavy kick drums and bass frequencies from pumping the limiter. Functioning as a studio master clock with minimal jitter and phase noise, the MBC provides simultaneous AES3, S/PDIF Coaxial, and TOSLINK Optical outputs, complemented by four selectable reference calibration levels (-14 dBFS to -20 dBFS).

Main features:

• Dual-path analogue architecture allowing instant switching between Class-A transformerless transparency and custom transformer warmth
• Integrated Silk Red and Silk Blue harmonic texture controls to dial in custom console saturation and tonal weight
• Active Compound Release analogue limiter featuring a fixed 10:1 ratio, 0.5 ms attack time, and variable release from 50 ms to 1 second
• Sweepable 12 dB/octave sidechain high-pass filter (20 Hz to 250 Hz) for precise bass management in the limiter circuit
• Reference-grade 24-bit/192 kHz PCM A/D conversion powered by premium AKM converter architecture
• Four selectable reference level calibration standards (-14 dBFS, -16 dBFS, -18 dBFS, and -20 dBFS) driven by high-precision relay attenuation
• Studio-grade internal master clock with minimal jitter and phase noise, featuring Word Clock BNC input and output for universal digital synchronisation
• Comprehensive digital output suite providing simultaneous AES3 (XLR), S/PDIF Coaxial (RCA), and S/PDIF Optical (TOSLINK) signals
• Dual 22-segment high-resolution LED input level meters with customisable 1-second and 3-second peak hold modes
• Dual 8-segment LED gain reduction meters providing instant visual feedback on limiter performance
• Stereo linked and dual mono operating modes for maximum flexibility during mastering, mix bus processing, or multi-channel tracking
• Rugged 1RU steel chassis with detented Alps and Noble potentiometers and Panasonic sealed relay switches for long-term reliability

Tech Specs:

• Product Type: Reference-Grade Master Bus A/D Converter & Analogue Limiter
• Conversion Architecture: 24-bit / 192 kHz reference-grade PCM A/D conversion (AKM AK5397EQ ADC & AK4115VQ transceiver)
• Supported Sample Rates: 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz
• Reference Calibration: Selectable -14 dBFS, -16 dBFS, -18 dBFS, -20 dBFS (referenced to +4 dBu / 1.228 V RMS)
• Clock Performance: Low-jitter, low-phase-noise internal master clock; Word Clock In & Out via BNC
• Conversion Latency: 0.95 ms @ 44.1 kHz, 0.88 ms @ 48 kHz, 0.48 ms @ 88.2 kHz, 0.43 ms @ 96 kHz, 0.22 ms @ 176.4 kHz, 0.19 ms @ 192 kHz
• Signal Paths: Switchable Class-A Transformerless or Custom Inter-Stage Transformer
• Saturation Circuitry: Variable Silk Red (mid/high enhancement) & Silk Blue (low-end warmth) with Texture control
• Input Impedance: 9.9 kΩ balanced XLR
• Common Mode Rejection: 105 dB typical @ 1 kHz
• Frequency Response: 20 Hz to 70 kHz (±0.025 dB Transformerless / ±0.1 dB Transformer)
• THD+N (@ 1 kHz, -2 dBFS): 0.0009% typical (Transformerless) / 0.002% typical (Transformer)
• Noise Floor (10 Hz – 22 kHz): -108 dBFS typical (Transformerless) / -114 dBFS typical (Transformer)
• Limiter Topology: Compound Active Release analogue limiter with THAT Corp 2181A VCA stage
• Limiter Ratio & Attack: Fixed 10:1 compression ratio; fixed 0.5 ms attack time
• Limiter Gain & Threshold: Gain: 0 dB to +20 dB (0.75 dB steps); Threshold: -14 dBFS to 0 dBFS / Over
• Limiter Release & Sidechain HPF: Release: 50 ms to 1 s; Sidechain HPF: Sweepable 20 Hz to 250 Hz (12 dB/octave Bessel filter)
• Operating Modes: Stereo Linked or Dual Mono operation
• Analogue Inputs: 2 x XLR line-level inputs (Channels A & B, Transformer-Like Amplifier design)
• Digital Outputs: Simultaneous AES3 (XLR), S/PDIF Coaxial (RCA), and S/PDIF Optical (TOSLINK)
• Sync Connectors: 1 x Word Clock BNC Input, 1 x Word Clock BNC Output
• Visual Metering: Dual 22-segment LED input meters (-60 to 0 dBFS); Dual 8-segment LED gain reduction meters (0.5 to 14 dB)
• Form Factor: 1RU 19-inch rackmount chassis
• Dimensions (W x D x H): 483 x 235 x 45 mm
• Weight: 3.6 kg 
• Discover Rupert Neve Designs Premium Audio Solutions: https://rupertneve.com/products/master-bus-converter