In conventional CD players, or CD transport~DAC combination, with multi-bit DAC chip, the original I²S signal is converted to S/PDIF format at the transport circuit, then converted back again to I²S at the receiver of the DAC section.

For 4735 CD player, Junji Kimura created a proprietary 3D circuitry which enabled to avoid this extra conversion by connecting the I²S output of the chip on the transport circuit directly to the I²S input of the DAC chip.

4735 Midnight Blue CD player has opened a new stage to already well-known organic, analog like sound of 47 Lab’s CD play back system.