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無帰還 · No Feedback
Balanced end to end.
Relays turn the volume.
The Soulnote A-1 ver.2 is a completely non-NFB integrated amplifier — Soulnote's philosophy, made attainable.
Soulnote A-1 ver.2 Integrated Amplifier
Popular upgrades
Pairs well with
Hand-built in Japan. Every part chosen by ear.
Soulnote A-1 ver.2 Integrated 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: 3 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 8 ohms (120 W into 4 ohms) — real drive from a completely non-NFB circuit.
with frequency response reaching from 3Hz to 300kHz.
compact chassis, spiked mechanical grounding and metallic insulators as standard.
Technical specifications
| Output power | 80W x 2 (8Ω); 120W x 2 (4Ω) |
| Circuit topology | Perfectly balanced, discrete, completely non-NFB |
| Volume control | Relay-switching balanced attenuator |
| THD | 0.08% (30W, 8Ω) |
| Frequency response | 3Hz – 300kHz (±1.0dB, 8Ω, 1W) |
| S/N ratio | 110dB (IHF A network) |
| Input impedance | 16kΩ (balanced) / 8kΩ (unbalanced) |
| Dimensions | 430 x 109 x 418 mm |
| Weight | 10.0 kg |
What changed from the A1 to the ver.2?
How much power does it deliver?
Why a relay attenuator instead of a volume pot?
About the Soulnote A-1 ver.2 Integrated Amplifier
Availability: Ships in 10–15 business days.
The Non-NFB Philosophy, Made Accessible
Founded by ex-Marantz engineer and director Norinaga Nakazawa, Soulnote designs "100% based on the actual sense of hearing" — and the Soulnote A-1 ver.2 brings that uncompromising philosophy to its most attainable integrated amplifier. Like its bigger siblings, the A-1 ver.2 is a completely non-NFB design: no global negative feedback loop of any kind, prioritising signal purity and transient life over tidy measurements. The result is the vivid, three-dimensional, alive-sounding presentation that has made Soulnote a cult name among the world's high-end listeners.
Perfectly Balanced, Discrete, No Feedback
The A-1 ver.2 delivers 80 watts per channel into 8 ohms (120 watts into 4 ohms) from perfectly balanced, discrete non-NFB circuits. Carefully paired output transistors with low Cob and high Ft characteristics keep the signal fast and clean, while volume is handled not by a conventional potentiometer but by a relay-switching balanced attenuator — preserving purity and channel balance at every listening level. It's an amplifier engineered, in true Soulnote fashion, to get out of the music's way.
Built Like the Reference Models
The ver.2 refinement carries Soulnote's obsessive mechanical engineering down to this price point: direct mechanical grounding via spikes, a symmetrical housing with resonance control, and metallic insulators fitted as standard. Everywhere you look, the goal is the same — drain away vibration and let the circuit sing. With a frequency response reaching from 3Hz to 300kHz and a 110dB signal-to-noise ratio, the A-1 ver.2 punches far above its compact 10kg frame.
Why You'll Love the A-1 ver.2
- Completely non-NFB, perfectly balanced discrete circuitry for vivid, lifelike sound
- 80W into 8Ω (120W into 4Ω) with real drive into demanding speakers
- Relay-switching balanced attenuator instead of a conventional volume pot
- Paired low-Cob, high-Ft output transistors for speed and clarity
- Reference-grade build: spiked mechanical grounding, resonance-controlled chassis, metallic insulators
Frequently Asked Questions
What does "non-NFB" mean and why does it matter?
NFB stands for negative feedback — a technique most amplifiers use to lower measured distortion. Soulnote deliberately omits it entirely, believing a global feedback loop robs music of its transient life and dimensionality. The A-1 ver.2 is a completely non-NFB design, tuned by ear for a vivid, three-dimensional sound.
Why a relay attenuator instead of a volume knob?
A relay-switching balanced attenuator uses precision resistors selected by relays rather than a continuous potentiometer, which preserves signal purity and keeps left/right channels perfectly matched at every volume — an approach usually reserved for far costlier amplifiers.
Will it drive my speakers?
In most cases, comfortably. It delivers 80W into 8 ohms and 120W into 4 ohms, with an output stage designed to supply the instantaneous current that real loudspeakers demand.
A-1 ver.2 Technical Specifications
| Output power | 80W x 2 (8Ω); 120W x 2 (4Ω) |
| Circuit topology | Perfectly balanced, discrete, completely non-NFB |
| Volume control | Relay-switching balanced attenuator |
| THD | 0.08% (30W, 8Ω) |
| Frequency response | 3Hz – 300kHz (±1.0dB, 8Ω, 1W) |
| S/N ratio | 110dB (IHF A network) |
| Input impedance | 16kΩ (balanced) / 8kΩ (unbalanced) |
| Input sensitivity | 700mV |
| Power consumption | 190W (operating), 90W (idle) |
| Dimensions (W x H x D) | 430 x 109 x 418 mm |
| Weight | 10.0 kg |