
Soulnote · A
A-3 CORE
Pure power, perfectly isolated for an uncompromisingly realistic stereo soundstage.
Building upon the foundation of the Series 3 flagship range, the A-3 Core is engineered for those who demand the temporal precision of the M-3 monoblocks in a single stereo chassis. It is a bold implementation of Soulnote's non-feedback philosophy, stripping away complexity to ensure the musical signal remains untainted by the interference that plagues traditional designs.
At its heart, the A-3 Core employs a fully balanced, non-NFB design that treats ground isolation as its primary objective. By leveraging unique enclosure construction and optimized circuit topology, the amplifier maintains complete physical and electrical separation between channels. This ensures that the dynamic energy and delicate timing cues of a recording are preserved with total integrity.
Sonically, the A-3 Core is defined by a sense of effortless agility and vast, three-dimensional space. It delivers a fast, uncoloured presentation that avoids artificial smoothing, opting instead for a vivid and authentic reproduction of the recording environment. It is a component for the listener who values absolute transparency, structural control, and the visceral excitement of an unconstrained performance.
Key Features
01
Complete Ground Separation
Achieves unprecedented ground isolation between left and right channels, eliminating cross-channel interference for a wider, more stable soundstage.
02
Single Push-Pull Output Stage
Utilises a single push-pull SEPP circuit with TO3 metal-can bipolar transistors to maintain micro-time axis accuracy.
03
Copper Bus Bar Heat Sink
A compact copper plate serves as both a heat sink and power bus bar, eliminating internal wiring and parasitic inductance.
04
Unfixed Mechanical Structure
Amplifier blocks, terminals, and covers are left intentionally loose and mounted on titanium sliders to dissipate mechanical vibration.

Chapter 01
Engineering Isolation
The A-3 Core takes the principle of ground non-grounding to the extreme. By decoupling the power supply units and grounding them to the chassis via ceramic washers, Soulnote creates a 'GND anchor' that effectively shields the signal path from high-current noise. This technical achievement, rarely seen in high-current stereo power amplifiers, results in a noise floor that is vanishingly low.
Two 700VA unimpregnated toroidal transformers are mounted vertically, ensuring magnetic flux lines are parallel to the circuit board, further reducing the risk of induced distortion within the delicate amplification stages.

Chapter 02
Structural Integrity
Vibration control is not an afterthought but a fundamental tenet of the design. The internal amplifier blocks are not rigidly fixed to the chassis; instead, they rest on a three-point lateral sliding structure equipped with titanium sliders.
This floating architecture allows the amplifier to shed its own intrinsic vibrations and those transferred from the power transformers, preventing resonance from polluting the musical signal and maintaining the purity of the temporal reproduction.

Chapter 03
The Core Philosophy
By distilling the Series 3 architecture into a dedicated stereo power amplifier, the A-3 Core offers a direct pathway to the brand's most advanced amplification technology. It replaces the complex signal paths of integrated designs with a minimalist, high-speed approach that focuses entirely on current delivery and signal purity.
It is the ideal choice for those who have curated a high-performance system and require a final amplification stage that is honest, fast, and profoundly revealing.
Specifications
Model nameA-3CORE SE (Premium Silver), A-3CORE BE (Premium Black)
Rated output120W + 120W (4 ohm)
Total harmonic distortion0,27% (1W, 8 ohm)
Frequency characteristics2Hz bis 200kHz (+/- 3dB, 1W, 8 ohm)
Input sensitivity / impedance480mV / 24kΩ
Maximum gain33dB
Power voltage230V AC 50Hz
Power consumption180W/86W (during idling)
Maximum external dimensions454(B) x 189(H) x 435(D)mm
Weight29kg
Included accessoriesSpike board, spikes, spacer (for Spike board floating), power cable
