Four high-quality 32-bit Hyperstream DACs (ESS 9012, manufactured by ESS Technology) are used in parallel in monaural output mode, resulting in smooth sound quality.
The system master clock utilizes a low jitter (0.5 ps typ.) oscillator which greatly minimizes the amount of jitter in the signal. The LME49990 Q-Custom is employed as the op-amp that serves as the system’s low pass filter. Fine tuned by QUALIA, the LME49990 Q-Custom offers high-quality sound, ultralow distortion, and ultralow noise.
The circuitry of the output amplifier, including the headphone amplifier, is completely comprised of discrete components. This allows the system to deliver the beautiful sounds that QUALIA has intended, even when headphones are used.
The high-quality components that comprise the audio circuit are all carefully selected prior to mounting. For example, each individual component, such as MELF metal film resistors, PPS film capacitors, and electrolytic capacitors is thoroughly inspected by an engineer followed by strict in-house testing performed by QUALIA & COMPANY Only components that have passed these inspections will be used in the actual circuit boards. Such steadfast efforts during production results in the creation of a wide sound stage.
Four power transformers are installed within the unibody case; two analog power
The Left and Right channels feature completely independent analog power supplies which are largely responsible for sound quality. Schottky barrier diodes, which offer high-quality sound and low noise, are used as rectifier diodes and regulators are comprised of ultra-low noise, high-speed circuits. Together with electrolytic capacitors, only selected components are used in order to ensure stable operation over the long term.
So that the digital input signal is not affected, the digital power supply features a two-level configuration, comprised of a low-noise pre-regulator and low-noise local regulator. This prevents deterioration of sound quality caused by interference produced by each signal block.
One of the core characteristics of the INDIGO series is the utilization of cases featuring unibody construction. Rather than using recycled aluminum, the cases are machined from the same high-purity aluminum used to manufacture aircrafts and satellites before undergoing an alumite treatment and polishing by skilled craftsmen. After performing several comparison tests, the bottom plate is manufactured from iron to obtain a low center of gravity, and a spike used to prevent mechanical noise is installed to effectively distribute external vibrations that can easily have an effect on the system.
|Balanced||XLR x1||110 ohm||IEC 60958/AES-3 compliant|
|Coaxial||RCA x1||75 ohm||IEC 60958/AES-3 compliant|
|Optical||TOSLINK x1||JEITA CP1212 compliant|
|USB||USB Type B x1||USB 2.0 Full Speed Audio Class 1.0 compliant|
|Left Channel||32-bit Hyperstream||DAC ESS 9012 ｡ﾟ 2|
|Right Channel||32-bit Hyperstream||DAC ESS 9012 ｡ﾟ 2|
|Balanced, Coaxial||32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, 192kHz|
|Optical||32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz|
|USB||32kHz, 44.1kHz, 48kHz, 96kHz, 192kHz|
|Headphone||1/4″ (6.3 mm) Stereo Jack||100 mW 32 ohm|
|Voltage||AC 110-120V 60Hz (differs according to region)|
|Unit Dimensions||Width: 420mm, Height: 101mm, Depth: 520mm|
|Warranty Period||3 years parts and labor|
DAC with USB User Manual (5.8MB)
*Right-click to download PDF