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Soulnote M-3X Monoblock
• Overview – The Soulnote M-3X Monoblock, released in 2022, is a solid-state Class AB monoblock power amplifier engineered with Soulnote’s zero-negative-feedback philosophy to deliver reference-level dynamics, transparency, and musical realism.
• Zero-Feedback Circuitry – Employing Soulnote’s proprietary non-negative feedback topology, the Soulnote M-3X Monoblock preserves transient speed, harmonic integrity, and dynamic expression while maintaining exceptional control over demanding loudspeaker loads.
• Reference Mono Architecture – The Soulnote M-3X Monoblock features true monaural construction, oversized linear power supplies, mechanically isolated circuitry, and premium discrete components for outstanding channel separation and effortless musical presentation.
An enhanced current version of the M-3
We have been able to double the current delivery capacity without compromising the spatial expression or penetrating power of the single push, achieving in that way both delicate expression and overwhelming power.
Newly developed transistor pairing method
We have developed a new precise pairing method to match the fluctuation rate of hfe (current amplification factor), which consistently changes on the time axis due to transistor current changes during music playback. This method involves inputting hfe measurement data for a large number of transistors at various current values, calculating the Euclidean distance for all combinations, and then selecting transistor pairs that are within the standard value (a level that can be called identical if measurement errors are taken into account). Doing so has enabled us to achieve a “blur-free parallel push-pull” comparable to a single push-pull. The output stage transistors are a pair of industrial TO3 (metal can), the same type used in the M-3. The driver stage also incorporates the TO3P transistors to easily drive these two TO3 transistors for a total of four Darlington construction stages.
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Soulnote P-3 Preamplifier
• Overview – The Soulnote P-3 Preamplifier, released in 2022, is a reference solid-state preamplifier featuring a fully balanced, non-negative-feedback analogue design engineered to deliver exceptional transparency and musical realism.
• Zero-Feedback Architecture – Employing Soulnote’s proprietary non-negative-feedback circuit topology, the Soulnote P-3 Preamplifier preserves transient accuracy, harmonic integrity, and dynamic expression while maintaining an exceptionally low noise floor.
• Reference-Level Engineering – The Soulnote P-3 Preamplifier features dual-mono construction, discrete analogue circuitry, and mechanically isolated assemblies, delivering expansive soundstaging, precise imaging, and outstanding channel separation for flagship audio systems.
Type-R circuits are used inside the non-NFB balance amplifier
The output line amplifier uses Type-R discrete non-NFB balance circuits that have been finely tuned for preamplifier use. It also includes the newly-developed super high-quality naked foil resistors. With 1ohm emitter resistors and 3.9ohm output resistance, it delivers astonishing information detail and S/N presence for superior power preamplifier drive capabilities.
High-end resistance switching method audio volume control circuit
The best possible methods and the highest-quality parts create the best audio volume control. All the resistors in this unit are ultra high-quality, naked foil resistors. The switching relays also use the newly developed RSR-2-12D (Reference SOULNOTE Relay) ultralow loss custom relay. Volume control is configured with 144 steps in 0.5 dB intervals. Vibrancy and sound quality remain unaffected, even when lowering the volume.
RSR-2-12D (Reference SOULNOTE Relay)
An ultra-low loss glass tube sealed reed relay that performs similar to a mercury relay as a base has been further customized. This is an original custom relay created by SOULNOTE that can reach sound quality levels comparable to that of wire. Each P-3 contains 94 of these relays.
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SOULNOTE A-3 Reference Integrated Amplifier
• Overview – SOULNOTE A-3 Reference Integrated Amplifier, released in 2021, is a solid-state Class AB integrated design without DAC or phono, engineered for ultimate signal purity and unrestricted current delivery.
• Circuit Philosophy – Built around SoulNote’s zero-feedback, non-parallel architecture, the amplifier prioritises instantaneous current response, wide bandwidth, and natural harmonic flow, appealing strongly to purist audiophiles.
• Sonic Character – SOULNOTE A-3 Reference Integrated Amplifier delivers exceptional dynamic contrast, dense tonal colour, and expansive soundstage depth, excelling with difficult loudspeaker loads and revealing high-resolution source components.
• Specifications – Rated at approximately 120 W per channel into 8 ohms and 240 W into 4 ohms, with ultra-high current capability, wide frequency response, and discrete output devices optimised for low impedance control.
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Soulnote M3 Mono Amplifier
• Overview – The Soulnote M3 Mono Amplifier, released in 2019, is a solid state pure Class A monoblock design engineered with zero global feedback topology to deliver ultra-fast transient response and uncompromised musical transparency.
• Circuit Architecture – Built around Soulnote’s non-parallel push-pull output stage and discrete driver design, the amplifier emphasizes instantaneous current delivery, wide bandwidth, and exceptionally low phase distortion.
• Sonic Character – The Soulnote M3 Mono Amplifier is celebrated for explosive dynamics, deep tonal saturation, and expansive soundstage layering, making it ideal for high-resolution loudspeakers requiring precision and authority.
• Specifications – Pure Class A solid state topology, approximately 200W into 8Ω and 400W into 4Ω, wide frequency response beyond 20Hz–100kHz, extremely low distortion, and high current capability for difficult loads.
• Dimensions – Each chassis measures approximately 454 mm wide × 189 mm high × 430 mm deep, requiring generous ventilation to support continuous Class A thermal operation.
• Weight – Each monoblock weighs roughly 32 kg, reflecting oversized transformers, heavy aluminum construction, and substantial heat sinking for stable, long-term performance.
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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 A-2 Ver. 2 Integrated Amplifier
Soulnote A-2 v2
Soulnote A-2 v2 is a fully balanced, non NFB integrated amplifier designed to preserve timing, texture, and dynamic swing while offering flexible operating modes for real systems.
Design and engineering
The A-2 v2 carries Soulnote’s discrete, wide bandwidth gain architecture with a short signal path and mechanical tuning derived from the Series 3 program. Revisions to device selection, biasing, and grounding reduce stored energy and lower audible residue, yielding cleaner transients and a more stable image.
What changed from A-2 (previous version)
The v2 platform strengthens current delivery and simplifies the voltage gain loop for higher purity. The driver stage also uses the same TO3P transistor as the output stage. By passing a large current through the driver, it instantly compensates for HFE fluctuations caused by current changes in the output stage. This is the biggest difference and breakthrough from the prior version. The power amp mode now hard bypasses selector and volume control for those who prefer a separate preamp. Chassis and top cover treatment improve resonance control compared to the earlier A-2.
Connectivity and control
Balanced and single ended inputs are relay switched, with a balanced attenuator for consistent channel tracking. Four modes cover integrated stereo, bi amp mono, power amp stereo, and power amp bi amp. Control logic is isolated so audio circuits remain quiet during operation.
What distinguishes it
Fast, high current drive with a lively, uncompressed presentation and the flexibility to act as a true power amp when required.
Who it is for
Listeners who value natural timing, wide bandwidth clarity, and the option to reconfigure the amplifier as their system evolves.
In the box
Main unit, metal remote control, AC power cable, spike feet, documentation.
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SoulNote E-2 v2 Phono
• Overview – The SoulNote E-2 v2 Phono, released in 2022, is a solid-state MM/MC phono preamplifier featuring a fully balanced, non-negative-feedback analogue design for reference-quality vinyl playback and exceptional musical realism.
• Non-Negative-Feedback Design – Employing SoulNote’s proprietary non-negative-feedback circuit topology, the SoulNote E-2 v2 Phono preserves delicate analogue information, delivering outstanding transient response, ultra-low noise, and exceptional harmonic integrity.
• Reference Vinyl Performance – The SoulNote E-2 v2 Phono offers highly configurable cartridge loading and gain settings, producing expansive soundstaging, lifelike dynamics, and remarkable detail retrieval from both moving magnet and moving coil cartridges.
New Type-R circuit for optical cartridges
The analogue circuit for the optical cartridge incorporates the fully balanced, non-NFB “New Type-R Circuit.” This is also employed in SOULNOTE’s flagship phono equalizer E-3. The equalizer element is constructed using a differential emitter bypass circuit. This has succeeded in significantly reducing the circuit impedance. “New Type-R Circuit” is electrically stress-free, without requiring phase compensation or bandwidth limiting. This fully exploits the benefits of the optical cartridge, liberated from the constraints of coil weight, magnetic circuit mass, and inductive resistance. The combination of the photoelectric system’s excellent transient response and the non-NFB design creates an overwhelmingly vivid and intensely lifelike musical space.
XLR connector for the power-isolated cable
Compatible with the power-isolated cable adopted in SOULNOTE’s flagship phono equalizer E-3. By separating the signal and LED power supply, it maximizes the benefits of the optical cartridge.
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SoulNote A-1 Ver. 2 Integrated Amplifier
• Product Overview – SoulNote A-1 Ver. 2 Integrated Amplifier, released in 2022, is a solid-state Class AB integrated amplifier using Soulnote’s zero-feedback philosophy, delivering exceptional speed, transparency, and natural musical flow.
• Circuit Architecture – Designed with fully discrete, non-NFB circuitry and simplified signal paths, the amplifier prioritises phase accuracy, micro-dynamic resolution, and tonal purity, appealing to listeners seeking uncoloured, high-resolution playback.
• Sound Performance – The SoulNote A-1 Ver. 2 Integrated Amplifier offers agile bass control, vivid midrange articulation, and extended treble clarity, pairing effortlessly with revealing loudspeakers and high-quality digital or analog sources.
• Specifications – Output power is approximately 80 W per channel into 8 ohms and 160 W into 4 ohms, featuring wide bandwidth, high current delivery, and a robust linear power supply.
• Dimensions – Approximate chassis dimensions are 454 mm (W) × 179 mm (H) × 407 mm (D), housed in a resonance-controlled aluminium enclosure optimised for electrical stability and thermal management.
• Weight – The unit weighs approximately 24 kg, reflecting its substantial transformer, high-capacity power supply components, and rigid mechanical construction designed to minimise vibration and noise.
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Soulnote E-1 v2 Phono
• Overview – The Soulnote E-1 v2 Phono, released in 2022, is a solid-state MM/MC phono preamplifier featuring a fully balanced, non-negative-feedback analogue design for exceptionally transparent and dynamic vinyl playback.
• Pure Analogue Circuitry – Employing Soulnote’s proprietary non-negative-feedback topology, the Soulnote E-1 v2 Phono preserves low-level musical information while delivering outstanding transient speed, natural tonal balance, and ultra-low background noise.
• Flexible Cartridge Matching – The Soulnote E-1 v2 Phono provides adjustable gain and loading options for both moving magnet and moving coil cartridges, ensuring optimal compatibility and performance across a wide range of turntable systems.
New Type-R Circuit
The output amplifier incorporates the “New Type-R Circuit” developed for SOULNOTE’s flagship phono equalizer E-3. The dedicated power supply for the optical cartridge also employs the same discrete non-NFB regulator found in higher-end models. This forms the source of its organic and warm sound.
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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.