Soulnote A-1 Integrated Amplifier

To extract the best from the unique characteristics of SOULNOTE's original perfectly balanced, discrete non-NFB circuits, we re-examined every minute detail of our amplifiers for possible improvements, like incorporating ground plane star wiring, centralizing local non-NFB regulators, implementing direct coupling routes, optimizing the tuning of the drive current, and more. This helped us achieve even more vibrancy and speed while also providing a wider sound range.

Perfectly balanced, discrete non-NFB circuits

To extract the best from the unique characteristics of SOULNOTE's original perfectly balanced non-NFB discrete circuits, the amplifiers were re-examined for possible improvements such as incorporating star wiring in the ground plane, centralizing non-NFB local regulators, and implementing feedforward. routes, optimized drive current settings and much more, which helped achieve even greater brightness and speed, as well as provide a wider audio range.


A-1 White Pages

Relay-switching balanced attenuator

The volume control in the A1 does not use a conventional rotary or electronic volume control. Instead, it uses a newly developed relay attenuator style balanced configuration. This dramatically increases clarity, and allows the sound image to emerge in three dimensions. It also significantly improves quality at low volume levels without fear of gang errors.

Direct mechanical grounding construction

Spikes connect to the bottom of the transformer's center of gravity to directly expel harmful vibrations without interfering with the unit housing itself. This achieves both supremely vibrant musical expression and a high S/N.

Symmetrical housing with resonance control

The housing's symmetrical construction increases rigidity balance while controlling the sharpness of resonance (Q factor). This eliminates the usual sensation of sound containment in highly rigid systems and creates the high resolution, expansive SOULNOTE sound. The newly developed, heavyweight aluminum front panel design also helps control resonance.

Metallic insulators as standard equipment (when under load)

Though plastic insulators are the conventional standard, we now use metallic insulators since they promote higher sound quality.

High-speed, discrete non-NFB power supply

In addition to a newly developed bifilar wound, large capacity toroidal transformer with independent positive and negative windings, we have lowered the impedance by connecting multiple high-voltage, small-capacity filter condensers in parallel and incorporating a fast recovery rectifier diode. We have also completely refined the smallest details in order to boost the power supply, such as making current loops as short as possible by placing the rectifier diode close to the power transformer. This further increases S/N and speed.

Power Design by Soulnote A–1

The current line-up Soulnote is based on new design concept.


Maximum output

80W ×2 (8ohm), 120W ×2 (4ohm)

Total harmonic distortion

0.08% (30W 8ohm)

Frequency characteristic

SPEAKER (8ohm 1W): 3Hz to 300kHz (±1.0dB

Input sensitivity/impedance

LINE1 (balance): 700mV/16kohm

LINE2, 3, 4: 700mV/8kohm

S/N ratio

110dB (IHF A network)

Power voltage

230V AC 50Hz

Power consumption

190W, 90W (during idling)

Maximum external dimensions

Main unit: 430(W)×109(H)×418(D)mm



Included accessories

Remote control, Spikes, Power cord

Materials PDF / Downloads

Click on the links below to download documents:

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