An item marked as Showroom Demo was used by AV Luxury Group for customers auditioning equipment in our retail store. We rarely sell our demo units unless the model or finish is no longer available. We go to great lengths to ensure our demo gear stays in mint condition. If anything isn't perfect, we make a note of that and post photos. Demo items carry a full manufacturer's warranty unless otherwise noted.
Condition of Product: Open Box, showroom demo, in excellent condition ! No marks, dents, or scratches. Like new, comes in original box & packaging with all the contents included.
Questyle CAS192D True DSD DAC
The Questyle Audio CAS192D takes all the great technology found in the standard version but adds Roberts ceramic PCBs, for ultra-low signal loss and extremely stable transmission, bringing the performance of this DAC to entirely new levels.
Unlike other DACs that claim DSD support, yet in actuality provide DoP ( DSD over PCM ), the Questyle Audio CAS192D accepts the DSD bit-stream directly from your computer, bypassing your computer’s audio processing and digital volume control as well as the Questyle Audio CAS192D’s digital filters, to provide True DSD, the way it was meant to be heard.
The Questyle Audio CAS192D achieves this without requiring expensive, difficult to install, proprietary connectors, or as is the case with DoP, breaking up the bit-stream into 16bit packets and compressing them into a PCM data-stream and then uncompressing them at the other end, buffering them, then reassembling the bit-stream so that it may be sent to the DAC as DSD. All of this requires an extreme amount of processing, at both the computer end and the DAC end, to perform in real time ( which invariably leads to latency, data loss, etc ), not to mention a 33% increase in bandwidth requirements for the USB ports and cabling.
IIR Digital Filter
Currently the majority of DACs use FIR ( finite impulse response ) digital filters, but research and testing has shown that our ears are very sensitive to the pre-ring that FIR digital filters add to the impulse wave, making the music sound incoherent and unnatural.
The Questyle Audio CAS192D offers the more advanced IIR digital filter, which completely eliminates the pre-ring from the impulse wave producing a more natural sound.
USB input supports True DSD and PCM 192kHz/24bit, with 3x clock asynchronous transmission structure
During every second of music, there are hundreds of thousands of time operations. Any micro errors will distort the sound.
In the Questyle Audio CAS192D, a 3x clock USB asynchronous transmission structure ensures a more accurate operation. To obtain first class sound performance, three corresponding level clocks ( custom made in Japan ), individually control multiples of 44.1kHz, 48kHz and USB signal transmission, dedicated to USB asynchronous transmission, reducing jitter to undetectable levels. A three-clock circuit is integrated with FIFO asynchronous architecture and three voltage-stabilized power stages, to ensure accurate sound.
Dual Clock Integral Up-Sampling
When up-sampling, 44.1kHz does not divide evenly into 192kHz, causing timing errors. To avoid this, the CAS192D uses two clocks, with extremely low phase noise, thus the processor automatically identifies the sample rate and up-samples integrally. If the input data is 44.1kHz, it will be multiplied by 4 to 176.4kHz; if the input data is 48k, it will be multiplied by 4 to 192k, which avoids those negative effects. The up-sampling is ASRC to avoid jitter.
On the front panel of the Questyle Audio CAS192D, there is an UP-SAMPLING button to allow the user to choose whether to up-sample or decode at the original sample rate (the current state of operation is displayed on the screen).
Specific Power Supply
The power supply section of the Questyle Audio CAS192D is second to none. A customized Plitron toroidal transformer, Schottky rectifier, 22pcs Nichicon 2200uF FG capacitors, 22 groups of individual power regulators, all ensure each section a stable and purified power supply. The DAC chipset uses 4 levels of digital filter and power regulation.
The Questyle Audio CAS192D aluminum chassis is produced by Foxconn using precise CNC tooling machines. The upper cover and bottom chassis “mutual bit” structural design provides the Questyle Audio CAS192D with stable heat, excellent control of sympathetic vibration and excellent shielding of RFI/EMI radiation.
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