VRDS (Vibration-Free Rigid Disc-Clamping System) is the core technology of the CD/Super Audio CD transport mechanism that Esoteric has been focusing on since the establishment of the brand. The disc is securely clamped to a turntable of the same diameter for rotation, thoroughly eliminating unwanted vibrations from the disc itself and the mechanism. Servo current is minimized by correcting disc warpage with the turntable and greatly improving the relative optical axis accuracy between the optical pickup and the disc pit surface. With these features, disc read errors are significantly reduced and achieves superior sound quality.

By assembling circuits with discrete components that have been carefully examined, we aim to perfectly reproduce the “vibrancy” and “energy” of music, which cannot be achieved with integrated chips. The pride of Esoteric’s top engineering team has been put to the test in the Master Sound Discrete DAC, a discrete D/A converter designed completely in-house.

Luxurious material input and massive current output capability

The Master Sound Discrete DAC was first installed in the Grandioso D1X and was highly acclaimed for its live sound. On the K-05XD, it condenses the essence of the Grandioso K1X version, but with a simplified circuit configuration that takes the 05 series to a new horizon. The DAC consists of 16 elements per channel, and each element consists of components such as clock drivers, logic circuits, capacitors, and resistors, while each key component is independent of each other, and the luxurious configuration is a direct extension of the philosophy of the high-end models, so that all the energy of the music is output in its purest form.

High performance digital processing

Employing a proprietary Delta-Sigma modulator supporting 64bit/512Fs, the K-05XD supports the latest formats including DSD 22.5MHz playback. The FPGA digital processing algorithms for optimal playback of DSD and PCM, respectively, are dedicated algorithms developed for the Master Sound Discrete DAC.

Sound quality corroborated by advanced quality control

In discrete DACs, where component tolerances directly affect calculation accuracy, a high level of expertise and quality control is required in the manufacturing of electronic boards. Esoteric's own factory boasts world-class board mounting technology, including soldering in an oxygen-free furnace in a clean room with medical quality. The high quality of Master Sound Discrete DACs is supported by technology cultivated in the manufacturing experience of electronic circuit boards for audio, medical, aerospace, and defense applications.

Esoteric-HCLD, a unique output buffer circuit

The Esoteric-HCLD (High Current Line Driver) output buffer amplifier employs a device that boasts an astonishingly high-speed slew rate of 2,000V/μs, which represents the response speed. The most important current transmission capability and speed for analog output circuits are pursued to the limit, reproducing the reality of music with breathtaking dynamic range.

ES-Link Analog, a high-quality sound current transmission

In addition to line connections (XLR, RCA), ES-Link Analog, Esoteric’s original current transmission method, is employed for connection to an amplifier. By taking advantage of the powerful current supply capability of the HCLD buffer circuit, the signal is less affected by the impedance of the signal path and can be transmitted powerfully, maximizing the potential of the compatible equipment.

Powerful power supply, a key to sound quality

With the all-new design platform, the power supply section is enhanced to more than twice the circuit scale of the previous model, adding even more punch and depth to the tone. A total of two high-capacity toroidal transformers are installed to provide independent digital and analog power supplies. In addition, a separate EI core power transformer dedicated to the control section provides lower noise and purer reproduction capability.

New low feedback DC regulator/supercapacitor

The power supply regulator is a discrete configuration that does not use integrated circuits in key parts, and employs a "Low-feedback DC regulator" that minimizes the amount of feedback to achieve a powerful and open sound. In addition, the K-05XD is equipped with a total of 16 supercapacitors (total capacitance: 250,000μF = 0.25F). By increasing the capacitance of the power supply, the resolution of the low range has been greatly improved.

USB Audio and MQA processing

Equipped with various digital input terminals including USB for DSD 22.5MHz and asynchronous transmission, the K-05XD behaves as a D/A converter unit. This Player includes MQA technology, which enables you to play back MQA-CD and MQA audio files and streams, delivering the sound of the original master recording.

It is no exaggeration to say that the clock circuit is the biggest key to high sound quality in digital playback. Esoteric focused on crystal oscillator circuits, which had been previously packaged as general-purpose modules in ICs, and completed a unique manufactured clock module, the “Master Sound Discrete Clock” for the Grandioso G1X, our flagship master clock generator. The G1X’s unique discrete circuitry has earned high acclaim for its superior musical expressiveness and has caused a stir in the world of clocks, which have traditionally been described only in terms of accuracy.

The “Master Sound Discrete Clock for Digital Player” first employed here in the K-05XD, applies this discrete circuit design concept to the internal clock of a digital player, exclusively. The unique circuit design using carefully selected discrete components, such as a large crystal oscillator, achieves high sound quality that reflects Esoteric's philosophy in every detail, which cannot be achieved with a general-purpose clock IC. The K-05XD also works with an external master clock generator to upgrade the sound quality by synchronizing the internal circuits to an even higher precision 10MHz clock.