Subject: Mobile
Manufacturer: Calyx

Introduction: Improving Portable Sound

The Calyx PaT is very small USB DAC and headphone amp that can be used with PCs and mobile devices, offering the possibility of better sound from just about any digital source. So how does it sound? Let’s find out!

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The PaT is a very interesting little device, to be sure. It rather resembles a large domino and weighs less than 1 ounce thanks to an ultra-light aluminum construction. It requires no battery or power source other than its micro USB connection, yet it provides sufficient power (0.8 V output) for in-ear monitors and efficient headphones through its 3.5mm headphone jack. Inside is a proprietary mix of DAC and amplifier circuitry, and like other products produced by Calyx, a Korean company with little presence in the United States, there is the promise of a dedication to great sound. Did Calyx pull it off with the diminutive PaT?

Improving Portable Sound

Outboard DACs and headphone amplifiers for computers and mobile devices are nothing new, with recent products like AudioQuest’s Dragonfly a prime example in the portable USB DAC market (though it offers no mobile support). When I first heard about the PaT during CES it was still in the prototype stage, but I was interested because of the Calyx name if nothing else, as I already owned the Calyx M DAP and had been quite honestly blown away by the sound.

So what need might I have for the interestingly-named PaT (pronounced "paat", meaning "bean" in reference to the small size), which is itself a DAC that requires another device to play music files? It wasn’t until I had the opportunity to speak with Calyx president Seungmok Yi during CES (via video chat as I couldn’t attend the show) that I started realize that this could be a compelling product, not just for the $99 price tag - a bargain for an audiophile product - but because of how versatile the PaT can be. You don't have to identify as an "audiophile" to appreciate the clearer and more detailed sound of a good DAC, especially when so many of us simply haven't heard one (especially on mobile devices).

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Continue reading our review of the Calyx PaT USB DAC and headphone amp!!

CES 2015: Calyx Audio PaT USB DAC and Headphone Amp for PC and Mobile

Subject: General Tech | January 6, 2015 - 06:51 PM |
Tagged: mobile, headphone amplifier, DAP, DAC, ces 2015, CES, audiophile, audio

For the audio enthusiasts at CES this year Calyx Audio (Korean maker of audiophile-grade audio components) has a new prototype to show along with last year's Calyx M music player, and for an audiophile product the pricing is very aggressive.

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Render of the Calyx PaT (dimensions in mm)

The PaT is a similar product in some ways as Calyx Audio's existing $199 USB DAC called the "Coffee", but this unit will be much smaller and will cost half as much at $99. And the reduction in price and size is only half of the story as the PaT also works with mobile devices as an outboard DAC/headphone amp. Apple iPhones and iPads will be supported, and Android devices with USB audio-out support as well (probably via USB OTG).

The PaT supports up to 16-bit, 48kHz files (AIF, M4A, PCM, OGG, and MP3) and will also control track playback and volume via hardware control buttons on the unit. The PaT requires no external power or battery, taking what little juice it needs directly from the connection to your mobile device. As for amplification, in typical Calyx fashion even this miniature board is using a discrete class A/B headphone amplifier. Since the PaT relies only on the power passed through the USB connection it is only capable of outputting 0.8 V, which by comparison is slightly lower than an iPhone 5 which outputs about 0.9 - 1.0 V.

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The tiny prototype PaT in action

The PaT may be just a working board at this point, but the company has scheduled the release for February 2015, when the devices will be available in various colors of thin aluminum enclosures.

In the world of computer audio much more attention has been focused lately on advancements in sound, with special shielding and isolation on motherboards, special gold-plated USB ports for DACs, and customizable op-amps a trend. While the market for dedicated sound cards isn't what it once was, high-end PCI-E and USB cards from Creative (Sound Blaster) and ASUS (Xonar) are still widely available. Most of these products are for desktop users, but there is a growing number of portable devices that allow mobile users to experience great sound, too. For myself, great sound means faithful reproduction of 2-channel music, and it's nice to see attention paid to that area without the added effects of digital signal processing (DSP). Calyx seems interested only in engineering products that play back music as close to the source as possible, and I can't argue with that!

The Calyx PaT is scheduled to launch in February for $99, but like most high-end audio components it will take a little research to track it down. The USA distributor of the Calyx brand has a website with product and contact information here.

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Source: Calyx

ASUS Xonar Essence STU USB DAC and Headphone Amplifier Launched

Subject: General Tech | October 23, 2013 - 06:44 PM |
Tagged: Xonar Essence STU USB, xonar, op-amps, headphone amplifier, DAC, audio, asus

Fremont, CA (October 22nd, 2013) - ASUS today announced the Xonar Essence STU USB external digital-to-analog converter (DAC) and headphone amplifier, based on the acclaimed design and quality of Xonar Essence ST/STX internal sound cards and going beyond their already high standards. Offering audiophile-grade performance, Xonar Essence STU delivers USB connectivity and accessible external controls.

It offers clear sound with a 120dB signal to noise ratio (SNR), strong 600ohm headphone amplifier, asynchronous USB audio and swappable Op-Amps for DIY sound modification. Precision clock tuning technology further enhances audio fidelity, making Xonar Essence STU a great choice for discerning music lovers who need a quality DAC and headphone amplifier to drive the full capabilities of high-end headphones.

"We received considerable positive feedback from customers regarding the excellent sound quality of Xonar Essence ST/STX sound cards, which led us to develop Xonar Essence STU as a USB device that offers even more premium audio quality plus easy controls and connectivity to notebooks. This is another example of ASUS listening to the community and acting on consumer demand”, said Ives Chiu, Audiovisual Product Manager at the ASUS Multimedia Business Unit.

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High quality precision audio
Xonar Essence STU delivers clean, clear, and low distortion sound with 120dB SNR. It achieves this thanks to exacting hardware design, which includes balanced (or mirrored) PCB layout for accurate reproduction of all sound sources and minimal component crosstalk, or interference.

ASUS uses audio industry-leading components such as the Texas Instruments PCM1792A DAC and TPA6120A2 headphone amplifier, which supports up to 600ohm impedance. Also included are audiophile-approved WIMA FKP2 and Nichicon Finegold capacitors for balanced and rich sound.

To satisfy the most demanding users, Xonar Essence STU features precision clock tuning technology and asynchronous audio transfer. Both ensure accurate and jitter-free sound fidelity, allowing customers to enjoy music in its purest form. Bit-perfect playback is aided by support for ASIO audio drivers.

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Complete ease of use
As an external device, Xonar Essence STU offers readily-accessible controls with no need to go into software menus. Customers can switch between low and high gain settings, accommodating better listening experiences across a wide range of headphones, from in-ear headsets (typically 16ohm-32ohm) to premium full-size headphones (up to 600ohm). This is especially useful with the increasing popularity of mobile devices, which normally ship with low impedance/high sensitivity headsets.

Dual volume controls help users change speaker and headphone sound levels simultaneously, similar to features offered by dedicated audio decks. The USB interface means connectivity with USB-compliant devices, while I/O ports include stereo RCA out, a 6.3mm headphone jack, two digital inputs, and auxiliary in.

Xonar Essence STU can be placed horizontally and vertically with a bundled stand, giving customers more space-saving flexibility for different locations and situations.

Tonal tuning and advanced controls
Texas Instruments NS-LME49720 and NS-LM4562NA Op-Amps (or operational amplifiers) deliver acoustics fine-tuned by audio engineers to support livelier and more detailed spacious sound.

Xonar Essence STU has room for three swappable Op-Amps, which can be replaced by users to adjust tonal performance based on personal taste. This open-ended and customizable design is inherited from previous Xonar Essence audio products, and remains true to the series’ commitment to accommodating as many customer preferences as possible.

Additional advanced features are a jumper switch that re-routes sound via Xonar Essence STU, allowing it to be used as a pre-amplifier in conjunction with a dedicated power amplifier. Customers can opt to adjust master volume directly on the power amplifier without having to reach Xonar Essence STU controls. Also, a selectable DC servo headphone output can be activated to minimize pop noise which may occur when powering on.

AVAILABILITY & PRICING
The ASUS Xonar Essence STU will be available from late October worldwide with an MSRP of US$399.

Source: ASUS