Sparkler Audio | Products | model S501 "air"

Sparkler Audio

スパークラー・オーディオ株式会社

model S501/S501i "air" ― Smart Headphones/Line Amplifier

Newly designed for current-mode signaling!

The electronically controlled attenuator and the input selector with no mechanical contact, has achieved dramatically powerful, lucid and clear sound quality. The sound with a sense of high speed, warm and relaxed does not feel sluggish seems to have been driven almost in the air. In addition to the conventional voltage-mode type (S501), we have also released a new type for current-mode audio interface (S501i). Once you listen to the sound quality of current-mode that has reached the area where you are awake, you will not forget.

How does the voltage-mode and the current-mode signaling works?

By adopting the principle superior current-mode signaling in exchanging music signals, it is progressing dramatically from the conventional audio system. By simplifying the conventional voltage-mode complex equipments, the purity of the music signal has been dramatically improved.
For more information, please read our "Technology" page.

Features

Smart Size ― Easy to wiring from rear panel.

In size-held in one hand, you do not choose a place to put it. Since the depth is narrow, it does not get in the way routing of the wiring from the rear panel.

Japanese Taste ― The texture of Japan.

The top plate in 5mm thick acrylic, lighting watermark handmade Japanese paper brings the texture of Japanese taste. Elegant and cool, finished with a timeless design. The color of the paper is by hope, you can choose from below color variations. You can also choose gray-smoke monotone or clea-transparent panel without Japanese paper.

Large Front Panel ― Easy to operate.

Because it has taken a wide width to depth, you can leisurely operation. Operation is the power switch, input switching, volume control knob, the mute only and does not need complicated settings.

Works As Line Amplifier ― Can easily drive power amplifier.

When you do not connect the headphones, you can also be used as a line amplifier. Since the output impedance is low, this can easily drive a variety of power amplifier. By hope, also supports changing the gain of the amplifier section (output level: up to about +20dBV @680Ω).

Sophisticated Internal Structure ― Fully discrete amplifier (S501).

By the electronically controlled input selector and attenuator with no contact, it achieved a clear sound quality with a sense of transparency. Low noise amplifier section adopts a little configuration of simple amplifier stage as much as possible, was the highest priority on freshness of the sound more than anything. Music that let no sense of speed you feel sluggish seems to have been driven almost in the air. Not tired to hear, it is characterized by the sound of a warm.

High Slew-rate Current Feedback Amplifier ― Input impedance 0Ω (S501i).

This newly designed fully discrete amplifier for current-mode signaling has input impedance 0Ω. Ultimate low noise, high S/N, high speed and strong sounds can be heard. Input volume is our newly designed electronically controlled current divider type attenuator (64 steps). With DC servo circuits, only a few mV of DC offset appears at the output. The photo shows gray-smoke monotone panel.

All Stainless Steel ― Good quality music dwells in a sturdy structure.

Including the chassis, spacers, bolts and nuts, all have adopted the stainless steel. Among the metal, stainless steel rigid vibration transmission speed (about 5740m / sec.) is comparatively faster. Not accumulate the vibrational energy to the chassis, the mechanical ground of the vibration that quickly performed, was to further improve the expressive power of a fine sound. In addition, the electrical resistance (internal loss) of stainless steel is larger than that of the copper and aluminum (about 429 times that of copper), to absorb the electromagnetic noise from the internal circuit and external environment, there is also the advantage of easily consumed as heat. In this way, we are contributing significantly to the low noise of the material of the chassis.

Specifications

model S501 — for conventional voltage-mode audio interface

  • Power Supply: Worldwide, depend on market (IEC 3 pin AC inlet), AC110~120V, AC220~240V (factory assembled)
  • Input Sources: RCA pin jack (unbalanced) ×3 selectable
  • Input Selector: Electronically controlled analog switch
  • Volume Control: Electronically controlled attenuator, impedance 20kΩ
  • Mute Switch: Mute/Unmute
  • Amplifier: Fully discrete BJT transistors, high slew-rate push pull DC amplifier
  • Voltage Gain: about +15.5dB (×6)
  • DC Offset: < 10mV
  • S/N: very quiet (under measurement limit)
  • Frequency Resoponse: 5Hz~120kHz (-3dB)
  • Load Impedance: 16~600Ω
  • Max Power: 600mW (@16Ω), 70mW (@600Ω), 16Vp-p
  • Output: standard phone jack (φ6.3mm), RCA pin jack (unbalanced) ×1
  • Size: W300×H46×D100mm
  • Weight: 1.6kg (without power cable)
  • Accessories: power cable for IEC 3 pin AC inlet, alternate fuse, userʹs manual

model S501i — for current-mode & voltage-mode audio interface

  • Power Supply: Worldwide, depend on market (IEC 3 pin AC inlet), AC110~120V, AC220~240V (factory assembled)
  • Input Sources: RCA pin jack (unbalanced) ×3 selectable
  • Input Selector: Electronically controlled analog switch (2×current-mode, 1×voltage-mode)
  • Volume Control: Electronically controlled attenuator, input impedance 0Ω/600Ω
  • Mute Switch: 0dB/-10dB/mute
  • Amplifier: Fully discrete BJT transistors, high slew-rate push pull DC amplifier
  • Voltage Gain: about +15.5dB (×6) equivalent
  • DC Offset: < 2..3mV (with DC servo)
  • S/N: very quiet (under measurement limit)
  • Frequency Resoponse: DC~500kHz (-3dB)
  • Load Impedance: 16~600Ω
  • Max Power: 600mW (@16Ω), 70mW (@600Ω), 16Vp-p
  • Output: standard phone jack (φ6.3mm), RCA pin jack (unbalanced) ×1 - voltage-mode
  • Size: W300×H46×D100mm
  • Weight: 1.6kg (without power cable)
  • Accessories: power cable for IEC 3 pin AC inlet, alternate fuse, userʹs manual

If you wish to use in Japan, please specify the product Japanese specifications. Please refer to the specifications of the Japanese page for more information.

Headphones Correspondence Table (Excel File)

Top Panel

Color variations of handmade Japanese paper

From left to right: gold, skyblue, purple, cream. Please choose your favourite color for top panel when you purchase order of this product.

Monotone Panel

You can also choose gray-smoke monotone or clear-transparent panel without Japanese paper.

Interfaces and types

Voltage-mode and current-mode signaling

This product has types corresponding to either conventional voltage input (S501) or current audio input (S501i) which is a new audio interface. S501i is also equipped with a single voltage input (600 Ω input impedance), one resistor converts to current input and sent to the amplifier, so it is possible to obtain a clearer, more powerful sound quality close to the characteristics of current-mode.

Retail Price

Set 99,000 JPY (+ shipping charge) ~ Available Now.