model S503 "spiral II"
Smart CD Player (*1) / CD Transport

*1 D/A Processor engine included

Digital beyond digital.

Newly designed 16-bit D/A Processor and the power supply unit is built in a compact size, and finished as an integrated CD Player. The techonlogy of the low noise thorough investigation, was to further improve the fine expressive power. So that it can be also utilized as a high-end CD Transport without bult-in D/A Processor engine, two digital coaxial outputs (S/PDIF) for complete dual monaural system.


Smart Size ― Easy to wiring from rear panel.

Complex mechanism also without the need for a top-loading, can be played by simply placing the CD in the center. If necessary, you can also be covered with a transparent dust cover which also reduces mechanical noise.

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.

Large Front Panel ― Easy to operate.

From the left, power switch, built-in DAC power switch, lighting and LCD backlight switch, operation switch of CD playback, a descriptive toggle switch of all operational feeling adoption.

Two Digital Coaxial Outputs ― Complete dual monaural configurations are possible.

So that it can be also utilized as a high-end CD Transport has been provided same signals but an completely independent coaxial output of the left and right two systems (75Ω, S/PDIF format). In order to avoid the interference of the left and right of the cross talk and ground, use an independent buffer amplifier to output, it is also ground side by further adopt a separate pulse transformer complete isolation (separation). As a result, if you make the two external DAC left and right independent, complete dual monaural configurations are possible.

Remote Controller ― Easy to hold, easy to operate.

It is easy to hold with one hand it makes it easy to operate the buttons with just the thumb. Since it operates with two AAA batteries and further saves power, it can be used for a longer period of time.


CD Transport Common (S503t/S503u)

  • Power supply: Worldwide, depend on market (IEC 3 pin AC inlet), AC110~120V, AC220~240V (factory assembled)
  • Mechanism: Top loading mechanism
  • Disc format: CD-DA, CD-DA format CD-R/CD-RW, CD layer of SA-CD (SA-CD, HD-CD is not supported)
  • Digital output: S/PDIF (coaxial) x2 (isolated same signals), 75Ω, 0.5Vpp
  • Operations: Front panel toggle switches, remote controller
  • Playbacks: stop, play/pause, previous/next, fast reverse/forward playback (x10), timecode (elapsed/remain, track/disc), repeat (track/disc)
  • Size: W300×H56×D200mm - Just A4/Letter size
  • Weight: 2.5kg (without power cable)
  • Accessories: power cable for IEC 3 pin AC inlet, remote controller, userʹs manual

Built-in D/A Processor engine (S503u)

  • Both internal and external DC power supply available. φ2.1mm DC jack to connect with such as 12V battery.
  • D/A converter: 16-bit non-oversampling DAC, Philips TDA1543
  • Output stage: Fully discrete BJT/JFET I/V conversion, phase correction, harmonic generator
  • Line output (voltage-mode): Unbalanced RCA pin jack max 2.0Vrms (0dB, 10kΩ load), L/R stereo x1
  • Line output (current-mode): Unbalanced RCA pin jack max 5.5mAp-p, able to connect to 0Ω devices

Top Panel

Color variations of handmade Japanese paper

From left to right: 1.white, 2.cream, 3.plum,, 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 S503t ― CD Transport (without built-in D/A Processor) ~ Can add this module later.

model S503u ― CD Player (include built-in D/A Processor) ~ Also can use both coaxial outputs.

Ask our authorized distributors/dealers.