Abbingdon Music Research - Digital Processor-777 €3.600


24/192kHz Asynchronous USB Audio Class 2.0 (XMOS)

Thermionic Electron Valves amplification stage:
2 x 6H1n-EV / 1 x 6H11P fitted
ECC88, E88CC, 7308, Cca, 6DJ8, 6922, 6H23n-EV optional
Total Harmonic Dist. + Noise (THD+N): <0.3%
Dynamic range:
>90 dB
Digital Audio Inputs: 2 x XLR/BNC with HD Valve Digital Input technology
2 x RCA/Toslink SPDIF Interface
1 x 24/192 Asynchronous USB


Aesthetix Pandora DAC USD 5,000.-

  • Card-based DAC with three digital input slots.
  • AES/EBU, RCA Coax, Toslink standard on digital input 1 slot.
  • USB standard on digital input 2 slot.
  • USB capable of class 1 audio (96KHz, 24bit) and class 2 audio (192KHz, 24bit).
  • 2nd USB input optional.
  • Asynchronous USB, (Streamlength®)
  • DSP based digital section using Motorola DSP56362 for digital filters.
  • DAC section based on Burr-Brown PCM1792A.
  • Analog section featuring four vacuum tubes in differential configuration.
  • Zero global feedback.
  • Balanced and single-ended outputs.
  • Volume control optional, allows DAC to drive a power amplifier directly. Switched resistor design.
  • Remote control of all functions.
  • Multiple stainless steel faraday cages isolate critical digital, analog and power supply sections.
  • Two transformers, one for digital circuits and one for analog circuits.
  • All aluminum chassis construction.
  • RS232 control.
  • 12v trigger.
  • Unit Weight: 35 Lbs
  • Dimensions: 18" width x 4 3/8" height x 18" depth


Pre-amp with analog, USB, Toslink and SPDIF input.

Analog line- and headphone out

Digital out (Toslink)


32-bit Texas Instruments PCM1795 DAC

XMOS-based asynchronous USB input 24-bit/192kHz, driver for Win.

1/8" analog input coupled to a AKM AK5386 AD converter (24-bit/96kHz) and the Toslink output allowing for digitizing analog input.


USB input coupled with Toslink output ( USB to SPDIF conversion)


Line output level:

2Vrms (unbalanced output)

THD: less than 0.01% at 1 kHz

Frequency response: 20 Hz/ 20kHz +-0.3dB


Headphones output:

6.35mm phone jack, 3.5mm phone jack

Supported headphone impedance: 16 ~600Ω

Output level: Max 100mW (32Ω loaded)

THD: less than 0.01% at 1 kHz, 32Ω loaded, 100mW

Frequency response: 20 Hz/ 20kHz +-0.3dB (32Ω loaded, 100mW)

Anedio D2 DAC US$ 1470

Pre-amp / DAC with various digital inputs and headphone out.

Asynchronous USB using the XMOS receiver, Thesycon driver for Win.



USB: 24 bits, 44.1K, 48K, 88.2K, 96K, 176.4K, 192KHz
SPDIF 75-ohm BNC + RCA: 24 bits, 44.1K, 48K, 88.2K, 96K, 176.4K, 192KHz
SPDIF 75-ohm RCA: 24 bits, 44.1K, 48K, 88.2K, 96K, 176.4K, 192KHz
Tosllink Optical: 24 bits, 44.1K, 48K, 88.2K, 96KHz






aqua acoustic quality La Scala MKII D/A Converter €4890

R2R ladder DAC with 4 Burr-Brown PCM -1704K arrayed in a true differential dual mono configuration.

ECC81 tube

THD + N <0.1% 1KHz -20dB


• Input:
- etherCON RJ45 AQlink (I2S serial bus) - 24 bit / 384 KHz
- AES/EBU balanced 110 ohm  -  24 bit / 192 KHz
- BNC coax (S/PDIF) 75 ohm  -  24 bit / 192 KHz
- RCA coax (S/PDIF) 75 ohm  -  24 bit / 192 KHz
- USB port  -  24 bit / 192 KHz
- AT&T (ST Fiber) -  24 bit / 192 KHz (optional)

• Analog output:
- RCA single-ended
- XLR balanced symmetrical

Added 2014

Asus Xonar Essence One € 400,-

Chipset Audio Processor :C-Media CM6631 High-Definition Sound Processor
Sample Rate and Resolution 44.1K/48K/88.2K/96K/176.4K/192KHz @ 16bit/24bit
S/PDIF Digital Input :
44.1K/48K/96K/192KHz @ 16bit/24bit
ASIO 2.2 Driver Support :
I/O Ports Analog Output Jack :
2 x 3.5mm RCA jack
1 x 6.3mm RCA jack
2 x Balanced Output (XLR)
2 x Digital S/PDIF Input : 1 x Coaxial, 1 x Toslink
1 x USB Input


ATOLL DAC200 €1500

Pre-amp with various digital inputs and headphone out

  • 1 AES/EBU
  • 2 SPDIF coaxi
  • 3 SPDIF optical
  • 1 USB : 24bits/192kHz (XMOS, driver for Win)
  • 1 wireless dongle


  • 1 coax
  • 1 optical
  • 1 RCA
  • 1 XLR
  • 1 headphone

DAC: BURR BROWN PCM1792 (24 bits/192 kHz)

Audeze DECKARD $699

Line Out  
Type Single-Ended Class-A
SNR 106dB A-Weighted
THD+N 0.00045% at 1kHz 2VRMS
Frequency Response 5Hz-100kHz, -1dB
(-0.03dB at 20Hz/-0.07dB at 20kHz)
Line Out Impedance 50 ohms
Headphone Out  
SNR 106dB A-Weighted
THD+N >0.1%, 20Hz - 20kHz
4W with 20 ohms load
Frequency Response 5Hz-100kHz, -1dB
(-0.03dB at 20Hz/-0.07dB at 20kHz)
Output Impedance 3 ohms
Output Power 4W at 20 ohms
DAC Section  
Sample Rate 16 - 32 Bit
  44.1kHz, 48kHz, 88.2kHz, 96kHz
176.4kHz, 192kHz
System Support Windows XP/Vista/7/8/8.1
USB2 driver requires installation
352.8kHz, 384kHz, Supported by Mac only
Native support for Mac OS 10.6.4 and above
Gain Low=0dB, Mid=10dB, High=20dB


Added 2015

Audio Alchemy DDP-1 US1,995.00


Pre-amp/headphone amp with analog an digital inputs

Analog Inputs: stereo XLR, 2 stereo RCA

Digital inputs: USB, AES/EBU, 2 RCA coaxial, 2 Toslink optical, I2S, auxiliary USB for firmware updates

Outputs: Stereo XLR and RCA, ¼-inch headphone jack, 12-volt DC trigger

Added 2016

Audio Research DAC9 US$ 7,500.00



USB2.0HS 44.1 to 384kHz, DSD, 2xDSD; RCA, BNC, XLR 44.1 to 192kHz; TOS 44.1 to 96kHz.

TUBE COMPLEMENT (2) 6H30 dual triodes.



DAC/Pre-amp/heaphone amp, streamer and musicserver in one.

The common legacy digital inputs + USB.

The common network protocols like DLNA and Airplay.

Plays from internal storage or external USB storage.

One who does it all.


Frequency Response
20 - 20KHz, +/- 0.1dB*

<0.001%, 20Hz-20KHz at 0dBFS

Dynamic Range
121dB, 20Hz-20KHz, A-weighted

Streaming Inputs
Network shared folder
USB Drive
Internal Music Storage**
uPnP/DLNA Media Server
TIDAL and Qobuz streaming
Internet Radio


Digital Inputs
1*USB device to computer
2*USB host to storage and DAC
1*RJ45 Gigabit Ethernet
1*802.11b/g/n/ac Tri-Band WiFi

Analog Outputs
1*Balanced XLR(output impedance 10 ohm)
1*Single-ended RCA(output impedance 50 ohm)
1*6.35mm headphone Jack (output impedance 5 ohm)

Supported File Formats


Supported Digital Formats
All PCM from 44.1KS/s to 384KS/s in 32Bit***
DSD64, DSD128, DSD256***

Output Voltage
4Vrms at Max. with dynamic-loss-free digital volume

Control Software
AURALiC Lightning DS for iOS
AURALiC RC-1 remote control
OpenHome compatible control software
uPnP compatible control software


Device Interface
512*64 pixels OLED Display

Power Consumption
Sleep: <10W
Playback:  35W at max.

11''W x 9''D x 2.6''H (33cm x 23cm x 6.5cm)

7.0 pounds (3.2kg)


* Tested under Filter Mode Precise for all sampling rate
** With optional 2.5-inch HDD or SSD installed
** 352.8KS/s and 384KS/s are supported through streaming and USB input only
*** 32bit is supported through streaming and USB input only
*** By 'DoP V1.1' or native DSD protocol through streaming and USB input only

Added 2016

AURALiC Vega US$ 3499 / € 3299

The purpose of Femto master clock is to give DAC an ultimate clock with extremely low jitter and phase noise. It utilizes aerospace grade crystal oscillator, ultra low noise linear power supply and temperature compensation technology to generate master clock with extremely low jitter performance at 82 femtoseconds(0.082 picoseconds). What's more important, the phase noise which affect sound quality a lot has been dramatically reduced to -168dBc/Hz.

Source: technical specs AURALiC Vega


Frequency Response: 20 - 20KHz, +/- 0.1dB*
Signal/Noise:126dB, 20Hz-20KHz, A-weighted
THD+N:<0.0003%, 20Hz-20KHz at 0dBFS
Dynamic Range:130dB, 20Hz-20KHz, A-weighted

Digital Inputs
1*USB 2.0 buffered by ActiveUSB™

Analog Outputs
1*Balanced(output impedance 2.2ohm)
1*Single-ended(output impedance 50ohm)

Supported Digital Formats
All PCM from 44.1KS/s to 384KS/s in 32Bit (352.8KS/s and 384KS/s USB only)
DSD64( 2.8224MHz) and DSD128(5.6448MHz) - 'DoP V1.1' standard, USB only


My listening impression can be found here

Ayre QB-9 US$ 2750.-

The company that made USB audio salonfähig in 2008 employing asynchronous USB.
Later support for UAC2 ( > 96 kHz) and DSD where added.

The QB-9 is no longer in producton.


Ayre White paper