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HomeEquipmentAmplifiers Soulnote A-3Core Power Amplifier
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Soulnote Audio

Soulnote A-3Core Power Amplifier

AED 67,999 inc. vat

Available on Backorder: Contact us for more information


Stereo power amplifier with A-3 converted to power amplifier

  • Rated output: 120W + 120W (4 ohm)
  • Complete separation of left and right channel GNDs
  • Single push-pull output stage
  • New Type-R circuit, fully balanced non-NFB
  • Super-strong power transformer
Brand

Soulnote Audio

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SKU: SN-A3C Categories: Amplifiers, Equipment
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  • Description
  • About Soulnote Audio
  • Specifications
Description

Complete separation of left and right channel GNDs

The GND separation technology incorporated in the P-3 pre-amplifier is applied to the A-3 Core power amplifier as well as the A-3 integrated amplifier. There is no precedent for GND non-grounding in stereo power amplifiers handling high currents. A-3 Core achieves power amplifier enclosure ungrounding through simple non-NFB circuits, optimized artwork design, minimization of high current loops, elimination of inductance components, and other factors. This led to the birth of the stereo power amplifier A-3 Core with completely separated left and right GND. The three-dimensional sound field space and spaciousness are the new frontiers of stereo power amplifier.

Single push-pull output stage

The output stage uses a single push-pull SEPP circuit with a TO3(Metal CAN-type) bipolar transistor as used in the M-3. It realizes blur-free music reproduction from ultra-low to super-high frequencies. The heart-stirring music reproduction is the result of the single push-pull that does not break the micro time axis purity

4-stage Darlington configuration with super-powerful driver and pre-driver

To drive the TO3(Metal CAN-type) transistor easily, ultra-powerful TO3P transistors are used in the driver as well as in the pre-driver. Ensuring perfect current supply all the way to the bottom end without regard to hfe fluctuation at high currents makes it possible to achieve both deep expressiveness and an exciting groove.

Copper bus bar heat sink

A lightweight, compact copper plate is used as the main heat sink. This heat sink also serves as a bus bar for supplying power to the TO3(Metal CAN-type) transistor, and the terminals of the TO3 transistor penetrate the bus bar and are mounted directly on the board underneath. This eliminates wiring, which is a drawback of the TO3 transistor, and helps overcome instability caused by the inductance component, while at the same time avoiding sound quality degradation caused by the insulation sheet dumping on the device. The sound quality effect is also extremely impressive, with a sense of freedom and transparency due to the physical independence of the heat sink from the chassis. Furthermore, in the A-3 Core, the power supply board and amplifier board are connected by a bus bar heat sink, which also serves as a structural component to form a block. It is truly a “four birds with one stone” heat sink.

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.

Unfixed structure

The amplifier block, terminals, AC inlet, top cover, and bottom cover are all unfixed. In particular, the amplifier block uses a three-point lateral sliding structure with titanium sliders. While escaping from the harmful vibration of the power transformer, it also releases its own intrinsic vibration.

About Soulnote Audio
Soulnote is a high-end Japanese audio brand redefining the boundaries of sound reproduction. Headquartered in Sagamihara City, Kanagawa, Japan, Soulnote is renowned for its radical approach to audio design—crafting every product purely by ear, without reliance on traditional measurement-based engineering.
Specifications
  • Model name: A-3CORE SE (Premium Silver), A-3CORE BE (Premium Black)
  • Rated output: 120W + 120W (4 ohm)
  • Total harmonic distortion: 0,27% (1W, 8 ohm)
  • Frequency characteristic: 2Hz bis 200kHz (+/- 3dB, 1W, 8 ohm)
  • Input sensitivity / impedance: 480mV / 24kΩ
  • Maximum gain: 33dB
  • Power voltage: 230V AC 50Hz
  • Power consumption: 180W/86W (during idling)
  • Maximum external dimensions: 454(B) x 189(H) x 435(D)mm
  • Weight: 29kg
  • Included accessories: Spike board, spikes, spacer (for Spike board floating), power cable

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Soulnote A-3Core Power Amplifier

AED 67,999 inc. vat Select options