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The flagship's power section.
Sold on its own.
The Soulnote A-3 Core is a stereo power amplifier — the flagship's non-NFB power section, distilled to just that.
Soulnote A-3 Core Stereo Power Amplifier
Popular upgrades
Pairs well with
Hand-built in Japan. Every part chosen by ear.
Soulnote A-3 Core Stereo Power Amplifier
無 Nothing in the way
Everyone adds.
Soulnote subtracts.
The best producers know the secret: the art is what you leave out. Soulnote engineers the same way — every stage a conventional design adds to the signal path is a chance to blur the original waveform, so Soulnote removes them, one by one, and tunes what remains by ear.
Between input and output: 4 extra stages, each with a fingerprint. Between input and output: almost nothing.
Every stage does a job — and leaves a fingerprint on the waveform as it passes through.
Fewer hands on the signal. What remains was chosen by listening — part by part.
Designed by subtraction
Less circuit.
More music.
into 4 ohms — completely non-NFB, with full left/right ground separation.
unimpregnated toroidal transformers, each with fast SiC rectifier diodes.
titanium slider suspension keeps vibration out of the signal.
Technical specifications
| Type | Stereo power amplifier, completely non-NFB, GND-separated |
| Power output | 120 W + 120 W (4 ohms) |
| Output stage | Single push-pull SEPP, TO3 bipolar transistors |
| THD | 0.27% (1 W, 8 ohms) |
| Frequency response | 2 Hz – 200 kHz (±3 dB) |
| Power supply | Dual 700 VA unimpregnated toroidal transformers, SiC diodes |
| Isolation | Three-point titanium slider suspension |
| Dimensions | 454 × 189 × 435 mm (with spikes) |
| Weight | 29 kg |
Is the A-3 Core an integrated amplifier?
What is GND separation?
What does the copper bus bar do?
About the Soulnote A-3 Core Stereo Power Amplifier
Availability: Ships in 10–15 business days.
The Flagship's Beating Heart: Soulnote A-3 Core
The Soulnote A-3 Core distils the power section of Soulnote's flagship thinking into a pure stereo power amplifier — 120 watts per channel of completely non-NFB, GND-separated muscle, built by ex-Marantz engineer Norinaga Nakazawa's team and voiced "100% based on the actual sense of hearing." It is engineering as obsession: every choice, from grounding to heatsink to suspension, made in the service of blur-free, three-dimensional sound.
GND Separation and a Copper Backbone
Its headline technology is complete separation of the left and right channel grounds — achieved through non-NFB circuits and meticulous layout — which unlocks a startlingly wide, stable soundstage. A single push-pull SEPP output stage using TO3 bipolar transistors keeps the signal path short and honest, while a newly developed Type-R circuit uses ultra-high-quality naked foil resistors for high, clean single-stage gain. A massive copper bus-bar heatsink does triple duty as heat sink, power distribution and structural spine.
Two Transformers, No Compromise
Dual 700 VA unimpregnated toroidal transformers with fast SiC rectifier diodes feed a high-speed non-NFB power supply, and the entire amplifier block floats on a three-point titanium slider suspension to keep vibration out of the music. At 29 kg, the A-3 Core is a serious amplifier for anyone building around a top-tier preamp or DAC-preamp.
Why You'll Love the Soulnote A-3 Core
- 120 W + 120 W (4 ohms) — completely non-NFB stereo power
- Full L/R GND separation — a wide, rock-stable soundstage
- Single push-pull SEPP, TO3 bipolar — short signal path, blur-free delivery
- Dual 700 VA toroidals + SiC diodes — high-speed, high-current supply
- Copper bus-bar heatsink — heat, power and structure in one
- Titanium slider suspension — vibration kept away from the music
- Hand-built in Japan — Premium Silver or Premium Black, 29 kg
Frequently Asked Questions
Is the A-3 Core an integrated amplifier?
No — it's a dedicated stereo power amplifier. It takes line-level input from a preamplifier or a DAC/streamer with volume control (such as the Soulnote D-3) and drives your loudspeakers directly.
What is GND separation and why does it matter?
By keeping the left and right channels' grounds completely separate, the A-3 Core prevents cross-channel interference, which sharpens imaging and widens the soundstage — a core part of the Soulnote sound.
What preamplifier or source pairs with it?
Any high-quality preamplifier, or a DAC-preamp like the Soulnote D-3 that can output a controlled line-level signal.
Soulnote A-3 Core Technical Specifications
| Type | Stereo power amplifier, completely non-NFB, GND-separated |
| Power output | 120 W + 120 W (4 ohms) |
| Output stage | Single push-pull SEPP, TO3 bipolar transistors |
| THD | 0.27% (1 W, 8 ohms) |
| Frequency response | 2 Hz – 200 kHz (±3 dB) |
| Input sensitivity / impedance | 480 mV / 24 kΩ |
| Power supply | Dual 700 VA unimpregnated toroidal transformers, SiC diodes |
| Isolation | Three-point titanium slider suspension |
| Dimensions (W × H × D) | 454 × 189 × 435 mm (with spikes) |
| Weight | 29 kg |
| Finishes | Premium Silver or Premium Black |
| Made in | Japan — Soulnote |