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SoulNote A-3 Core Amplifier
• Overview – The Soulnote A-3 Core Amplifier, released in 2022, is a solid-state Class AB integrated amplifier featuring a pure analogue signal path without built-in DAC or phono stage, engineered for uncompromising musical transparency.
• Non-NFB Circuit Design – Employing Soulnote’s proprietary non-negative feedback topology, the Soulnote A-3 Core Amplifier delivers exceptional transient response, natural harmonic reproduction, and outstanding microdynamic expression with remarkable sonic realism.
• Reference Japanese Engineering – The Soulnote A-3 Core Amplifier features a dual-mono architecture, oversized toroidal transformer, and mechanically floating construction to minimize vibration while maximizing clarity, soundstage precision, and musical engagement.
New Type-R circuit, fully balanced non-NFB
For voltage amplification, a newly developed high-gain-to-GND single-stage Type-R circuit is adopted. Naked foil resistors are used generously for all resistors involved in amplifier operation.
GND anchor
The GND of the left and right channel power supply units is grounded to the left and right-side metal insulated with ceramic washers, a special enclosure construction that acts as a GND anchor. A sense of openness and low-end grip is achieved at a high level.
Super-strong power transformer
2x 700VA unimpregnated toroidal power transformers are used for the power amplification, to the left and right. In addition, three power transformers, including the control system power transformer, are packed into one enclosure. They are all mounted vertically so that the magnetic field lines are parallel to the board.
High-speed non-NFB power supply
For the rectifying capacitor, a specially selected high withstand voltage small capacitance low magnification foil filter capacitor of only 470uF is used. To optimize the capacity, the number of units used was determined and the load on the power transformer was reduced. This further improved the real regulation of the ultra-powerful power transformer. For the rectifier diodes, SiC diodes of the latest specifications with enhanced allowable inrush current are used. This is the most powerful and high-speed power supply configuration ever considered. In addition, two large power relays with excellent sound quality are used independently and without fixing as power switches for the two main power transformer. Independent power switch for each power transformer, which is a high current contact point, is extremely crucial for sound quality.In addition, the power switch on the front panel is dedicated to the control system sub-transformer.
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SoulNote is a Japanese high-end audio manufacturer established with a clear philosophy of minimising signal interference and preserving musical energy at every stage of the audio chain. Emerging from Japan’s precision engineering culture, the brand focuses on non-feedback circuit design, simplified signal paths, and mechanical integrity, aiming to deliver sound that is immediate, dynamic, and emotionally engaging rather than overly processed.
SoulNote amplifiers, DACs, and source components are engineered with an emphasis on discrete circuitry, independent power regulation, and vibration control. These design choices are rooted in fundamental electrical principles rather than short product cycles, which makes pre-owned SoulNote equipment particularly relevant. Well-maintained pre-owned units continue to perform at a high level, offering transparency, speed, and tonal balance that integrate confidently into modern high-resolution systems.
Across Singapore, Malaysia, and Southeast Asia, SoulNote has gained recognition among audiophiles seeking Japanese engineering with a strong focus on musical realism and long-term ownership. On SoundTribeAsia, SoulNote equipment — new and pre-owned — is offered by verified dealers, providing transparent listings, clear condition reporting, and the assurance of purchasing through a trusted regional marketplace rather than fragmented individual dealer sites.