The Luna Procellarum realises a topology that has been theorised but never achieved commercially: a \u200b fully balanced, four-quadrant FET design in which four complete amplifier circuits operate in concert \u200b for every single channel. The result is absolute symmetry of current sourcing and sinking - consistent \u200b performance across all load quadrants, significantly improved linearity with large bass signal levels, \u200b and the near-total elimination of crossover artefacts through FET symmetry.
Designed by John Curl - whose five-decade career spans the Grateful Dead’s Wall of Sound consoles, \u200b the Mark Levinson JC-2 preamplifier, the Vendetta Research SCP-2 phono stage, and Parasound’s Halo \u200b JC series - the Procellarum is the physical embodiment of his life’s work brought to commercial reality \u200b for the first time.
“AMR is one of the few companies I’ve worked with since 2019 that is genuinely \u200b prepared to push engineering as far as it can go — in architecture, in parts quality, and \u200b in execution. The Procellarum is the result of what can happen when those compromises \u200b are kept to an absolute minimum.”
- John Curl, Principal Designer, Luna Procellarum
\nLUNA INGENII - A REVOLUTION IN \u200b DIGITAL CONVERSION
\nThe Luna Ingenii represents a complete rethinking of what a digital-to-analogue converter can be. \u200b Where conventional high-end DACs employ two chips and twenty supporting components, the Ingenii \u200b deploys 2×TDA1541A chips with over 400 components, 8×AD1862 chips with over 300 supporting \u200b components, and a 128-stage discrete Direct DSD engine using 32 chips and over 300 parts. The \u200b engineering density is not incremental - it is transformational.
\nTrue 32-bit Multi-Bit Architecture
\u200bBy combining multiple New Old Stock multi-bit chipsets in a proprietary parallel array, the Ingenii \u200b achieves true 32-bit resolution with a linearity and noise floor that no single-chip or delta-sigma \u200b implementation can approach. This is not upsampling. It is genuine bit-perfect, 32-bit, multi-bit \u200b performance at every bit depth.
128-Stage Direct DSD ‘Stonehenge’ Engine
\u200bStandard DSD implementations use a single chip and fewer than ten components. The Stonehenge \u200b engine uses 32 chips and over 300 - a 128-stage discrete architecture with no commercial equivalent. \u200b The result is a DSD path of unmatched purity, timing precision, and dynamic integrity.
Bit-Gravity™ Harmonic Weighting
\u200bAn AMR original, Bit-Gravity allows the listener to adjust the bit-weighting between the two different \u200b titan multi-bit chips (TDA1541A and AD1862) at the hardware level and in real-time - shaping the \u200b tonal character in a way that is physically real, not digitally processed.
“The Luna family represents our obsessive pursuit of preserving the beauty of recorded \u200b music. Years of research and thinking beyond convention have all been in service of a \u200b singular goal: preventing sonic degradation before it takes hold.”
- Collin Farch, Principal Designer, Luna Ingenii
LUNA MEDII - THE PURITY OF A \u200b WIRE WITH GAIN
\nThe Luna Medii preamplifier is built around a single radical principle: that controlling level, drive, and \u200b system interaction must add nothing to the musical signal. Traditional attenuators - potentiometers, \u200b stepped resistor ladders, volume ICs - all introduce series elements into the signal path. The Medii \u200b eliminates them entirely.
Zero In-Line Element Volume Control
\u200bAMR’s Zero In-Line Element Volume Control is a gain-based system in which no component ever sits \u200b in series with the signal. The result is a preamplifier with the transparency of a straight wire and the \u200b control of a precision gain stage - a topology that required new mathematical modelling, new noise floor control strategies, and years of original research to realise.
Advanced NOS Valve Architecture
\u200bThe Medii’s amplification stage is based around a hand-matched pair of NOS GE5670 valves. AMR \u200b firmly believes that valves are not only for “nostalgic colouration”, and when thoughtfully \u200b implemented, allow the Medii to remain sonically invisible whilst preserving the full timbre and \u200b dynamic expression of the musical signal.
ENGINEERING WITHOUT ECONOMIC \u200b CONSTRAINT
\nEvery decision in the Luna Series is dictated by circuit theory, noise physics, and engineering purity - not by bill-of-materials targets. The cost structure that results diverges radically from conventional \u200b high-end audio.
Component count: Luna models contain the equivalent of multiple complete devices inside each unit \u200b - 40× the component density of typical high-end equipment.
Component cost: Silver wiring at 120× standard cost. Audio Note Silver Tantalum resistors at 330×. \u200b Custom Teflon capacitors at 50×. WBT NextGen silver connectors at 50×. Each choice addresses noise \u200b floor, linearity, dielectric behaviour, or thermal stability in ways that are measurable and audible.
R&D investment: More than seven years of original research underpin each world-first architecture. \u200b The Zero-Element Volume Control, the 4Q FET amplifier, the Stonehenge DSD engine, and the \u200b AirLock™ power supply are new engineering protected by AMR’s intellectual property.
Production: Each unit is hand-assembled by senior technicians, there is no production method that can \u200b automate this level of precision.
PRICING & AVAILABILITY
\u200bIn keeping with AMR’s positioning alongside instruments of comparable cultural and engineering \u200b stature, pricing for the Luna Series is available upon enquiry from authorised AMR representatives and \u200b approved dealer partners. Pricing is shared transparently with qualified buyers, reviewers, and channel \u200b partners.
The Luna Series is available through AMR’s private client list and a curated network of authorised \u200b dealers worldwide.
PRESS CONTACT & REVIEW \u200b ENQUIRIES
\u200bListening slots, review samples, and interview appointments are available. Please contact our press team directly:
UK Ranieri Agency ifi@ranieri.agency
APAC Janet Yeung janet.yeung@ifi-audio.com
EU Kate Paciuch kate.paciuch@ifi-audio.com
USA Ricardo Anton ricardo.anton@ifi-audio.com
Luna does not announce itself loudly. It reveals itself - gradually, precisely, and unmistakably.
ABOUT ABBINGDON MUSIC \u200b RESEARCH (AMR)
\u200bFounded in 2001 and headquartered in Southport, UK, Abbingdon Music Research (AMR) is the high end sister company to iFi. AMR first introduced its acclaimed ‘77’ series in 2006, followed by the more \u200b accessible ‘777’ series in 2010. At a time when digital audio was often dismissed as ‘sterile’ and \u200b ‘lifeless’, AMR earned recognition for delivering rich, analogue-inspired sound through innovative and \u200b unconventional circuit design. By combining cutting-edge engineering with timeless musicality, AMR \u200b has remained dedicated to one mission: achieving the most satisfying musical enjoyment.
TECHNICAL SPECIFICATIONS
\nLuna Procellarum - Monoblock Power Amplifier
Principal designers
John Curl, Colin Farch, Yevhen Sobolevskyi
Amplifier topology
World’s first Four-Quadrant Fully Balanced FET - 4× component \u200b count of standard amplifiers
Configuration
Monoblock (one chassis per channel)
Power supply
Monoblock 3KV power supply (one chassis per channel)
Output devices
Exicon lateral MOSFETs; precision computer-matched per unit
Acoustic Space Stabiliser
Proprietary sub-audio environmental field-conditioning circuit
Key components
Audio Note Silver Tantalum resistors; Audio Note Kaisei \u200b Capacitors, custom AMR Teflon caps; custom AMR Polypropylene \u200b caps, pure silver wiring
Construction
Billet-machined chassis; non-magnetic hardware; custom \u200b heatsinks; 100% silver wiring, WBT silver nextgen connectors
Production limit
Maximum 148 sets worldwide
\n
Luna Ingenii - DAC
Principal designer
Colin Farch
DAC architecture
True 32-bit multi-bit: 2×TDA1541A (400+ components) + \u200b 8×AD1862 (300+ components)
DSD engine
128-stage discrete Direct DSD ‘Stonehenge’ - 32 chips, 300+ \u200b components
Volume control
None
Bit-Gravity™
User-adjustable bit-weighting allocation across different DACs
Power supply
AirLock™- battery-like low-impedance, galvanically isolated power \u200b architecture
\n
Key components
Audio Note Silver Tantalum resistors; custom AMR Teflon caps; \u200b custom AMR Polypropylene caps, 100% silver wiring, WBT silver \u200b nextgen connectors
Production limit
Maximum 176 sets worldwide
\n
Luna Medii - Preamplifier
Volume control
Zero-Element (no potentiometer, no attenuator, no volume IC)
Topology
Fully balanced differential; zero series elements in signal path
Amplification
Advanced, hand-matched NOS valve architecture
Power supply
AirLock™- battery-like low-impedance, galvanically isolated power \u200b architecture
Outputs
Balanced XLR; Single-ended RCA
Construction & \u200b
Components
Billet-machined chassis; 100% silver wiring; hand-matched \u200b Tantalum resistors; custom AMR Teflon caps; custom AMR \u200b Polypropylene caps, silver WBT silver nextgen connectors
Production limit
Maximum 186 sets worldwide
AMR · Abbingdon Music Research · amr-audio.co.uk
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