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Limited to 148 units
Statement Power Amplifier · Made in Great Britain
Luna Procellarum
Overview
LunaProcellarumisthepoweramplifieratthecoreoftheLunaseries-atruefour-quadrant,fullybalanced,FET-baseddesignengineeredincollaborationwithJohnCurl,conceivedtoestablishabsoluteauthorityoverloudspeakerbehaviour.
Key Features
Defining characteristics
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Fully Balanced FET Signal and Power Topology
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Four Actively Regulated Output Domains
100W+ Pure Class A Operation with Selectable Class A/AB Behaviour
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Distributed High-Capacity Energy Reservoir System
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Multi-Layer Resonance-Controlled Chassis
Total Authority. Complete Control.
Loudspeakers are not passive recipients of music. They push back - generating an energy of their own and returning it to the amplifier, defining its stability. Most amplifiers accommodate this behaviour. Luna Procellarum was engineered to govern it – designed with a single objective: absolute command of the loudspeaker under all conditions.
Craftsmanship
Command in Both Directions.
The true four-quadrant architecture is derived from high-consequence engineering environments used in CERN, NASA, and ASML EUV platforms. All four output sections remain continuously active and independently regulated, distributing current symmetrically across the full musical waveform. Forward drive and returned energy from the loudspeaker are treated identically - resulting in behaviour that remains stable under load, without loss of control. Transients land with authority. Decay resolves without smear. The space between notes remains intact.
John Curl DesignFully BalancedPure Silver WiringFour-Quadrant Control
Correction where it Belongs.
Developed alongside John Curl, the current-feedback architecture functions as a stabilising field rather than a corrective mechanism. Loop gain remains consistent across the audible range, with minimal phase deviation. Three Class-A biased operating zones further suppress low-level nonlinearity, maintaining continuity through zero-crossing regions.
Control
Four Active Output Sections
Four continuously engaged output sections controlled by independent feedback loops distribute power evenly across the waveform and preserve symmetry during current reversals.
Linearity
Fully FET-Based Topology
JFET and MOSFET devices are used throughout the signal and power path for square-law transfer behaviour, low intrinsic noise, fast overload recovery, and predictable time-domain performance.
Authority
High-Current Delivery
Very high instantaneous current capability and output voltages exceeding 70 V RMS allow effortless reproduction into demanding loudspeaker loads.
Stability
Balanced Architecture
Mirrored current flow and high intrinsic power-supply rejection reduce reliance on corrective feedback and contribute to stable operation under dynamic conditions.
Technical Excellence
Control. Symmetry. Stability.
The Luna Procellarum is defined not by any single technology, but by the cohesive integration of multiple, carefully selected design principles, each contributing to a unified objective: stable, symmetrical, and authoritative control of real loudspeakers under real operating conditions.
700W
RMS into 8Ω
1200W
RMS into 4Ω
Four quadrants. One amplifier.
The distinction lies not in the existence of four-quadrant operation, but in how symmetrically, continuously, and predictably control is maintained across those quadrants.
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Designed for real loudspeakers
Real loudspeakers are reactive electromechanical systems. They generate back-electromotive force, present complex impedance profiles, and demand accurate control in both current directions at all times.
Authority without imposed character
The result is reproduction that combines authority with transparency, allowing musical dynamics, structure, and nuance to emerge naturally.
Specifications - Luna Procellarum
OVERVIEW
- Product Type
- Reference Monoblock Power Amplifier
- Series
- AMR Audio Luna Series
- Topology
- True Four-Quadrant, Fully Balanced, Fully FET-based, Class A / Class AB (user-adjustable)
- Designers
- John Curl, Yevhen Sobolevskyi, Colin Farch
- Production Limit
- Limited to 148 units
OUTPUT STAGE
- Topology
- Four-Quadrant - 4 active output sections with independent regulation
- Device Type
- Lateral MOSFET output stage (Exicon)
- Input Stage
- Low-noise JFET (near-zero gate current, no base-current shot noise)
- Signal Path
- Fully FET-based (JFET input + MOSFET output) - no bipolar devices
- Class A Mode
- 100 W+ pure Class A, user-selectable
- RMS Output
- 1,200W @ 4Ω, 700W @ 8Ω
- Max Output Voltage
- >70 V RMS
- Feedback
- Current-feedback (CFA) topology; feedback poles outside audio band
- Feedback Loops
- Two independent feedback loops regulating all four quadrants
PROTECTION
- Type
- Ultra-fast MOSFET-based output protection
- Speed
- Up to 100,000× faster than mechanical relays
- Characteristics
- No contact wear, no arcing, no sonic degradation during normal operation
CONTROL & DISPLAY
- Display
- 4-inch high-resolution capacitive TFT display
- Monitoring
- Supply-rail voltages, bias conditions, output power, safety/load state, Class-A level
- Connectivity
- App-based monitoring (OTA updates)
ARCHITECTURE
- Balance
- Fully balanced from input to output - high-power currents do not flow through signal ground
- Crossover Region
- Three Class-A biased operating zones; transconductance continuous through transition
- Device Matching
- Precision computer-aided matched output device pairs; parallel operation within optimal regions
CONSTRUCTION
- Chassis
- Solid copper inner chassis + aerospace-grade aluminium outer - multilayer sandwich
- Copper Purpose
- High mass, EMI shielding, microvibration damping
- Aluminium Purpose
- Stiffness-to-weight ratio, dimensional stability, structural rigidity
- Internal Wiring
- Pure silver conductors
- Speaker Connectors
- WBT NexGen silver output connectors
- Capacitors
- Polyethylene film + Audio Note KAISEI + audio-grade electrolytics
- Power Devices
- Exicon lateral MOSFETs
POWER SUPPLY
- Capacitance (Film)
- 15,400 µF polyethylene film per channel
- Capacitance (KAISEI)
- 120,000 µF Audio Note KAISEI per channel
- Capacitance (Total)
- >250,000 µF audio-grade electrolytic per channel
- Reservoir Design
- Multi-dielectric, multi-value strategy (film + KAISEI + electrolytic)
Gallery
Luna Procellarum
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