CES 2016 Press Center
Questyle QP1 / QP1R, CMA800R Headphone Amp, CAS192D DAC & More

  Award-winning products from Questyle Audio will be at the Venetian hotel 29th floor suite 317 at CES 2016. You can hear new digital audio products from the innovative creators of the renowned QP1R high-resolution digital audio player, current-mode headphone amplifiers, audiophile wireless components and more.

About Current Mode Technology
This is a story about the creation of a high-end audio amplifier, and about a quest, a vision and perseverance as well. It has been nearly a century since the audio amplifier came into being, where the first application of a tube audio amplifier was involved. Wang Fengshuo (Jason Wang), founder and CEO of Questyle Audio, was deeply attracted to hi-fi audio from the time in which he listened to it, for the first time, when he was a seven-year old boy. Days later, like many other electronics enthusiasts, he bought all kinds of electronic components, picked up his soldering iron and tried every kind of circuit and device, immersing himself in his own world.

Questyle QP1 And QP1R Portable Media Players
Three years ago, Questyle sparked upon a plan to design a high-resolution portable music player (DAP). They set an almost impossible goal for true music lovers and professional audiophiles to enjoy the same hi-fi listening experience achieved in state-of-the-art home based systems within a portable body. Thus Questyle created an impressive arc body with a twin steering wheel design, supporting DSD128 and 24-bit/192kHz PCM files. Pure Class A amplification, discrete transistors and components all supply the ample headphone amplifier that incorporates Questyle Audio's patented "Current Mode Amplification" to ensure warm and powerful sound, which makes the QP1 & QP1R masterpieces of portable DAPs.

The Questyle Audio QP1 & QP1R's support ALAC, APE, FLAC, AIFF, WAV, WMA Lossless up to 24-bit/192kHz and high-Res audio files such as DSD128 and DSD64 playback reveal far much more of the original sound performance of music than that of Mp3 players or smart mobile phones. The Questyle Audio QP1 & QP1R follow the same 3X Clock design of the Questyle Audio CAS192D. The 3X clock USB asynchronous transmission guarantees a more stable and precise operation. The three-clock integrated circuit with FIFO asynchronous structure and three voltage-stabilized power stages ensure accurate sound. With Cirrus Logic flagship DAC (CS4398) chips, the DAPs are able to capture more details hidden within music.

The helm style volume control and the machined aluminum hollowed-out protective crown inspired by a fine watch, against inadvertent volume change, and preventing accidental damage to headphone plugs while carried in a pocket or a case. Another feature is the "Steering Wheel" control for menu, allowing a quick track selection of the QP1 & QP1R.

Features include:
• 3300Mah battery life up to 10 hours

• Maximum storage capacity of 288GB 

• Mobile universal Micro USB jack for charging

• Patented "Current Mode Amplification" in headphone amplifier, all discrete components, pure Class A circuit.

•File Format Support：WAV, FLAC, ALAC, APE, AIFF, ADPCM, LPCM, MP3, WMA,WMA Lossless, OGG, AAC, DFF, DSF

•Sample Rate of PCM Native: 44.1 kHz - 192 kHz（16bit/24-bit, ）DSD Native: DSD64(1bit 2.8MHz)/DSD128(1bit 5.6MHz)

• DAC isCirrus Logic CS4398

•Output： 3.5MM headphone output, 3.5MM line out & optical output 

•Frequency Response: 20Hz-20 kHz（±0.1dB)

• QP1 THD+N= 0.0015%

• QP1 R THD+N = 0.0006%

Questyle Audio CAS192D DAC
The quest is over! 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. 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.

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. 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.

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. 

Features include:
• DAC Chipset： WM8741

• Digital Filters in PCM mode： Five switchable IIR (MP) and FIR (LP) filters

• 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, and KS

• Output amplitude RCA：2.44Vrms, XLR ：4.88Vrms

• THD+N：< 0.005%

• Digital Input： USB, S/PDIF, PCM 44.1K-192K/16-24bit


• USB Input： 44.1 kHz to 192kHz from 16 to 24 bits PCM and True DSD

• Analog output： Balanced XLR  and unbalanced RCA

• Dimension： 330 x 300 x 55 MM (WxDxH)

You can learn about these and other excellent products at www.QuestyleAudio.com.

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