K-07 Digital Source Device

    The Overview

    ESOTERIC K-07 is a new model of our highly acclaimed K series Super Audio CD/CD player. The design concept of the K-07 is clear and simple -- a 2-channel D/A converter with a disc transport that gives a stress-free musical experience, without adding or removing anything from the original source material. Design and engineering was completed applying all of ESOTERIC’s audio technology, and evolutionary materials for which cost was not a consideration.

    The K-07 is a high performance model that follows the philosophy of the top-end all-in-one K-01 digital source, committed to advancing the “state of the art” for the 2 channel audio purist, for both high resolution audio files and SACD playback.

The Features

VOSP Mechanism


 VOSP (Vertically-aligned Optical Stability Platform), features a specially designed shaft-mounted laser pickup assembly. This pickup design ensures that the laser optical axis is always at the center of the data track for highly accurate data reading. This pickup system is widely used in the ESOTERIC SACD transports and players including the reference level products, the P-02 and the K-01. The VOSP mechanism is rigidly clamped by a steel plate and a large diameter stabilizer made of 8mm-thick steel for superior anti-resonance and anti-vibration properties.

Dual mono D/A converters based on the concept of the K-01

 The analog output circuit of the D/A converter has both high end resolution as well as natural and musical texture. Asahi Kasei's top-end 32-bit DAC device "AK4399" is used. This component provides the heart that drives the expressive power of ESOTERIC's "K" series products. A parallel/differential output where two circuits combine per channel provides high linearity and low noise. The converters and analog output circuits, which make up a fully dual mono configuration, are located on the left and right hand sides of the board, completely separated from the digital signal processing circuit. This layout allows for excellent channel separation and high-quality playback with rich localization and sonic depth.
AK4399 is the Audio4pro™ and is a branded product of ASAHI KASEI MICRODEVICES CORPORATION that is designed for professional studio and digital audio applications.

Large capacity toroidal transformer that handles high speed transients with ease


 Large toroidal transformer features low noise, low distortion, and high current with very high efficiency. The strong power circuits, combined with very large power capacitors, supply stable and clean power to all circuits.

Multiple D/D functions to suit multiple sources

 In addition to playback at the original sample rate and word length, extensive D/D conversion modes for PCM formats include PCM up conversion to x 2 or x 4 from the original sampling frequency, using the "RDOT" algorithm, as well as PCM > DSD conversion to convert the PCM audio signal to DSD format similar to Super Audio CD. Super Audio CD is directly converted into analog signals and played back.

Four types of digital filters and digital filter “Off” mode

 The K-07 features Digital Filter Off mode recommended by ESOTERIC, which is characterized by a smooth and subtle sound quality. The model also features four types of digital filters for PCM signal processing. In addition to two types of FIR (Finite Impulse Response) digital filters, two types of short delay digital filters (Referred to as "apodizing" filters) are installed. These filters eliminate the pre-echo in the impulse waveform to reproduce audio signal as a more natural and precise sound.


Three systems of high sampling rate digital inputs

 The K-07 features three systems of digital inputs (USB, coaxial and optical), and these digital inputs support high-sampling-rate sources up to 24 bit / 192kHz.

Supports "Direct Master Clock LinK" with an external clock generator

"Direct Master Clock Link" is our new technology originally developed for the P-02/D-02 combo for more precise, direct clocking. With this technology, the D/A converter simply uses ultra high precision "master clock (22.5792MHz)" supplied from external master clock, without a need to "sync" its operation to the master. This system enables shorter-path clocking by bypassing internal PLL circuit, and delivers more precise, focused imaging.

The Specs

Compatible disc types (playback) Super Audio CD, CD (including CD-R and CD-RW)
Analog audio
Connectors XLR connector (2ch) x 1
RCA connector (2ch) x 1
Output impedance XLR: 100 Ω
RCA: 25 Ω
Maximum output level (1 kHz, full-scale, into 10 kΩ) RCA: 2.45 Vrms
XLR (set to 0dB): 2.45 Vrms
Frequency response 5 Hz to 55 kHz (- 3 dB)
S/N ratio 115dB
Total harmonic distortion 0.0015% (1 kHz)
Digital audio output RCA connector x 1 0.5 Vp-p
Optical digital connector x 1 -15 to -21 dBm peak
Digital audio input RCA connector x 1 (input impedance 75 Ω) 0.5 Vp-p
Optical digital connector x 1 -24.0 to -14.5 dBm peak
USB-B connector USB2.0 standard
Clock sync input format Connector BNC
Supported input frequencies (±15 ppm) CD/SACD: 44.1, 88.2, 176.4, 100 kHz / 10, 22.5792 MHz
USB (HS_2) input:
44.1, 48, 88.2, 96, 176.4, 100, 192 kHz / 10, 22.5792, 24.576 MHz
Input impedance 75 Ω
Input level Rectangle wave: equivalent to TTL levels,
Sine wave: 0.5 to 1.0 Vrms (50 to 75 Ω)
General Power supply AC 230 V, 50 Hz
AC 120 V, 60 Hz
AC 220 V, 60 Hz
Power consumption 12W
External dimensions (W x H x D, including protrusions) 445 mm x 131 mm x 358 mm
(17 1/2" x 5 1/8" x 14 1/8")
Weight approx. 14 kg (30 7/8 lb)
Included accessories Power cord set x 1
Remote control (RC-1301) x 1
Batteries for remote control (AAA) x 2
Owner's manual x 1
Warranty card x 1
- This product is available in three different power supply variations shown in the specification section above. Make sure that the voltage shown on the rear panel matches the AC line voltage in your area.
- The shape of the AC inlet and plug of the supplied power cord depends on the voltage rating and destination country.