The Questyle Audio CAS192D Digital-to-Analog Converter

A Fantastic Combination of Sound and Digital Technology!

The Questyle Audio CAS192D, the first DAC equal to the performance of Questyle’s Current Mode Amplification, is now the world’s first DAC to support True DSD.

True DSD

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, 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 which 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, 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 correspondence level clocks (custom made in Japan), individually control multiples of 44.1kHz, multiples of 48kHz and USB signal transmission, dedicated for USB asynchronous transmission, reducing Jitter to undetectable levels. A three-clock integrated circuit with FIFO asynchronous architecture and three voltage-stabilized power stages ensure accurate sound. 

Dual Clock Integral Upsampling

When upsampling, 44.1kHz does not divide evenly into 192kHz, causing timing errors. To avoid this, CAS192D uses two clocks, with extremely low phase noise, thus the processor automatically identifies the sample rate and upsamples 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 upsampling is ASRC to avoid Jitter. On the front panel of the Questyle Audio CAS192D, there is an UPSAMPLING button to allow the user to choose whether to upsample 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. 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, provide the Questyle Audio CAS192D with stable heat, excellent control of sympathetic vibration and excellent shielding of RFI/EMI radiation.

DAC Chipset Wolfson Flagship Chip WM8741

The sound of WM8741 can be described as classic "English"-style, delivering a soft and exquisite sound. Due to Questyle's high requirements for D/A design, LPF is discarded (per Wolfson’s suggestion) in the Questyle developed analog output circuit for the WM8741, receiving official praise from Wolfson. 

“Questyle has very good products, I like their design. I’m very appreciative that the Wolfson DAC chip is so well applied in Questyle products, especially; the CAS192D design and sound both impressed me so much. I will bring this CAS192D to Edinburg, let our engineers to see what a beautiful product Questyle do. I will put it into Wolfson audition room, let our staff to hear the beautiful sound.”

--Eddie Sinnott

Vice President from Wolfson Microelectronics


Match the Questyle Audio CAS192D with Headphones

Questyle Audio CAS192D connected to the Questyle Audio CMA800R drive Sennheiser HD800

“The resulting sound, especially with a top level system such as dual CMA800R with the LCD-3 or HD800 was simply ravishing. DSD on the Questyle Audio CAS192D has a sense of ease to it that I find very easy to enjoy, while maintaining a highly detailed sound. There's realism to it, a sort of three dimensional presentation that goes beyond just soundstage, which makes it incredibly lifelike and immersive. This is among the best DSD playback I've ever heard. " 

--John Grandberg


Match the Questyle Audio CAS192D with a Traditional HIFI System

The Questyle Audio CAS192D is a world class DAC and a perfect match for a traditional HIFI system in conjunction with a computer as a music server or a high-end CD transport.


DAC Chipset: WM8741

Digital Filters in PCM Mode:
5 switchable IIR (MP) and FIR (LP) filters

Digital Filters in DSD Mode:NO

Upsampling in PCM Mode:
Dual Clock integral upsampling, ON/OFF switchable

OS for USB Input:
Win XP,Vista,Win7,Win8 and Mac OS

Media Player for USB Input:Any player

Core Audio for USB Input: WASAPI,ASIO,KS

Output Amplitude RCA:
2.44Vrms XLR :4.88Vrms

THD+N< 0.005%

RCA:115 dB, XLR:116 dB

Digital Input:
USB,SPDIF,PCM 44.1k-192k/16-24bit

USB Input:
44.1k-192k/16-24bit PCM and True DSD

Analog output:
Balanced(XLR) and unbalanced(RCA)


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