Smart Size ― Block configuration that can be placed anywhere.

Since each unit is small, you can hold with one hand and place it anywhere. Depending on the usage situation, you can put everything in a rack, or place the power amplifiers near the speakers. Since they are separated from the power supply, there is no need to worry about crosstalk, and the sound with a stable focus and spaciousness is reproduced.

Japanese Taste ― The texture of Japan.

Elegant and cool, finished with a timeless design. The color of the handmade Japanese paper is by hope, you can choose from below color variations. You can also choose gray-smoke monotone top panel.

Essentials only Operation ― All with remote control.

There is no operation other than the power switch for the main unit, and complicated settings are not required. With the included remote control, you can perform all operations from a distance. It gives listeners more freedom to use, freeing them from operational constraints.
Selected line input is indicated by the color (1-red, 2-green, 3-blue) of LED at the front panel, and is reverted after turn on.

No Habit Sound Quality ― Thoroughly eliminate the element that causes the stagnation of the music signal.

For switching the line input signals, a long-life and highly reliable reed switch (contact: ruthenium) in which an inert gas is filled in a glass tube is adopted, and deterioration of freshness is extremely reduced. Thoroughly eliminates connectors and terminals with many metal parts, plated conductors, excessive amount of solder, etc., and reproduces the natural depth and spread without any electronic device odor and elegant and stress-free. For volume control, we have adopted a proprietary electronically controlled attenuator (32 steps) with no mechanical contacts, and controls the sending current like a valve.

Superiority of current-mode signaling ― Sophisticated internal structure for pure sound.

With current-mode, the signal path and circuit are dramatically simplified, greatly contributing to the freshness of sound. One line input is compatible with conventional voltage-mode and uses newly designed voltage-current conversion. After that, all treat the music signal as a current. The input current is amplified linearly as it is, and there is no mutual conversion of voltage and current that always accompanies signal deterioration. The less non-linear factors the amplifier has, the less oppressive it is. With an open and natural sound and agility that doesn't feel cluttering even with clarity, it makes you forget the existence of audio equipment.

Ultimate 25 watt ― Enough to enjoy music in your living room.

Compared with small transistors, high power transistors tend to be unfocused and low resolution in sound character. By selecting high performance semiconductors, we developed this ultimate 25 watt amplifier. Incredible clear, sparkling, full-bodied and overtone-rich sound. There is no operation other than the power switch for the power amplifier, just connect the cables. Since it is connected to the control amplifier with ultra-low impedance, long wiring is possible (several meters).

Universal Speaker Terminals ― Banana plugs & various cables can be attached.

A speaker terminal compatible with banana plugs has been standard specification. This enables various speaker cables such as bare wire cords, Y-type (spade) terminals, C-type terminals, fine pins, and banana plugs.

Specifications

model S513i ― Control Amplifier

• Power Supply: Worldwide, depend on market (IEC 3 pin AC inlet), AC110~120V, AC220~240V (factory assembled)
• Input: RCA jack (unbalanced), current-mode (0Ω) × 2, voltage-mode (20kΩ) × 1
• Selector: inert gas sealed reed switch (contact: ruthenium)
• Amplifier: Fully discrete, 7 BJT linear current amplifier
• Current Gain: about 10 dB (×3)
• Volume Control: original electronically controlled attenuator (32 steps)
• Output: RCA jack (unbalanced), current-mode (connect with S514i)
• Dimension: W202 × H47 × D202 mm (excluding protrusion)
• Weight: 1.8 kg (without power cable)
• Accessories: remote controller, power cable for IEC 3 pin AC inlet, alternate fuse, userʹs manual

model S514i ― Monaural Power Amplifier

• Power Supply: Worldwide, depend on market (IEC 3 pin AC inlet), AC110~120V, AC220~240V (factory assembled)
• Input: RCA jack (unbalanced), current-mode (0Ω) x 1
• Amplifier: Fully discrete, dual JFET + 9 BJT, high slew-rate design
• Voltage Gain: about 29 dB (×28)
• DC Offset: less than ±30 mV (muted, thermally stable state)
• Frequency Response: DC ~ 500 kHz (-3 dB)
• Output Power: maximum 25 watt (8Ω), universal speaker terminals (φ4.0 mm)
• Dimension: W102 × H60 × D202 mm (excluding protrusion)
• Weight: 1.8 kg (without power cable)
• Accessories: power cable for IEC 3 pin AC inlet, alternate fuse, userʹs manual

Top Panel (for model S513i)

Color variations of handmade Japanese paper

From left to right: 1.white, 2.cream, 3.plum, 4.sky-blue, 5.purple, 6.olive, 7.beige. Please choose your favorite color for top panel when you purchase order of this product.

Monotone Panel

You can also choose gray-smoke monotone top panel.

Retail Price

model S513i "pastoral" ― Current-mode Control Amplifier with Remote

model S514i "rhapsody" ― Current-mode Monaural Power Amplifier
(Paired units required for 2-channel stereo)

Ask our authorized distributors/dealers.

Recommended System

To use as a 2-channel stereo, we recommend following system.

• model S513i "pastoral" ― Current-mode Control Amplifier with Remote
• model S514i "rhapsody" ― Current-mode Monaural Power Amplifier (paired)
• model S203 ― RCA Pin Line Cable (S513i ~ S514i), 0.7 m × 2