An introduction to computer audio
USB Audio class 1 is limited to 24 bits/ 96 kHz maximum.
This is what fits into USB Full Speed mode so 12 MHz (USB 1).
To play higher sample rates the High Speed mode (USB 2, 480 MHz) is needed.
From mid-2010 on both OSX and Linux supports USB audio class 2 natively.
If the DAC is USB audio class 2 compliant it will play up to 32/384 on these systems without the need to install additional drivers.
Microsoft doesn't have a native mode USB Audio class 2 driver. You need to install a third party Class 2 Audio driver at the PC side.
All DACs listed in this section requires USB 2 (High Speed).
The fact that they do need USB 2 (High Speed) does not necessarily imply they are also USB audio class 2 compliant.
Using High Speed might have an unexpected consequence.
Some audiophile USB cables are of such a low build quality that they will fail you the moment you switch to high speed mode.
The higher band width simply requires a digital cable build to close tolerances.
A lot of USB audio class 2 compliant DACs use the XMOS chipset.
Sagittarius has compiled an overview.
Traditionally a DAC has a digital in and a analog out.
Today a lot of them also have volume control, line out and headphone out.
Basically a pre-amp with digital inputs and as it is a pre-amp sometimes even an analog input too.
The information below is as supplied by the manufacturer's website.
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%|
|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
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
1/8" analog input couple to a AKM AK5386 AD converter (24-bit/96kHz) coupled with the amp and the Toslink output allowing for digitizing analog input.
USB input coupled with Toslink output ( USB to SPDIF conversion)
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
RCA and XLR
1 USB 2.0 + driver for Win
USB receiver: XMOS
1 I2S 100 Ohms TTL Level,
2 SPDIF coax 75 Ohms,
1 AES/EBU, 110 Ohms,
1 RCA, 1 MINI JACK
1 RCA, 1 XLR, 1 Headphone
Receiver: Cirris Logic C58416
ASRC: TI SRC4192 (can be bypassed)
DAC: TI PCM1794A
Analogue Audio Output
|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
Pre-amp with various digital inputs and headphone out
DAC: BURR BROWN PCM1792 (24 bits/192 kHz)
USB 2.0 (44.1KHz-192KHz, up to 32Bit), driver for Win, ASIO
S/PDIF (44.1KHz-192KHz up to 24Bit)
Balanced analog output, 4Vrms
Single-ended analog output, 2Vrms
AES/EBU Digital Output
Frequency response: DC - 20KHz, +/- 0.02 dB
Signal/Noise: 118 dB, 20Hz-20KHz, A-weighted
THD+N: <0.0005%, 20Hz-20KHz at 0dBFS
Dynamic range: 124dB, 20Hz-20KHz, A-weighted
Texas Instruments SRC4392 upsampler with two crystal clocks.
DAC AKM AK4399
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
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
1*USB 2.0 buffered by ActiveUSB™
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
DAC with a 2 Watt class A headphone amp.
Output: 6.3mm jack / 4-pin XLR.
3.5 mm analog
Integrated SDXC card reader
File format: PCM 24/384, DSD128
Frequency Response: DC - 20 kHz, ± 0.25 dB
Signal/Noise: 110 dB (unweighted)
Output Level: 4 volts balanced, 2 volts single-ended
The USB receiver section is isolated from the
rest of the audio circuitry with high-speed opto-isolators. This means that the RFI generated by the multitude of clocks operating inside the PC and its noise-generating switching power supply is completely kept out of one’s music system.
DAC with volume control, line and headphone out.
DSD over USB ( DoP 1.0)
Supports USB Audio 1 & 2. Driver for Win.
2x4 32-bit DACs
DAC with preamp.
Asynchronous USB (24/192) with driver for Win.
Headphone/pre-amp DAC with separate volume controls for the headphone and line outputs.
24/192 async USB, AES/EBU, Toslink and coaxial digital inputs and RCA/XLR analog outputs plus standard 6.3mm and XLR headphone sockets.
• Dual 192K/32Bit AKM DAC’s
• Independent dual power Supplies
• Discrete Class A analog output stage
• Selectable synchronous upsampling (176.4K/192K)
• Independent analog and digital signal paths
• Inputs: 192/24 USB (1, asynchronous), COAX (2), OPTICAL (2), AES-EBU (1) BNC (2)
• Fully differential balanced XLR and unbalanced RCA stereo outputs
• Transformer coupled SPDIF and AES EBU digital inputs
• SPDIF COAX bypass loop output
Headphone amplifier/ Pre amplifier / DAC
1 x USB Connection
1 x Coaxial RCA (Support up to 24bit @ 192Khz)
1 x Toslink / SPDIF (Support up to 24bit @ 192Khz)
2 x RCA line level input
1 x headphone jacks 6.35mm
1 x RCA Pre Amp output
1 x RCA DAC direct line out
Channel Separation: 140 dB @ 1KHz, 130 dB @ 20KHz
THD+N: 0.0005% @ 1KHz, 0dBFS
COAX & Toslink / SPDIF : 32 bits / 44.1K, 48K, 88.2K, 96K, 176.4K, 192KHz
OS Requirement: Windows XP, Windows Vista, Windows 7, Mac OS X
USB : 24 bits / 44.1K, 48K, 88.2K, 96K, 176.4K, 192KHz
Support up to 24bit @ 192Khz with 10ppm low jitter clock
Asynchronous Transfer Mode
DAC with volume control.
Claimed dynamic range of 132dB, THD of 0.0001% and RMS jitter of 500 femto seconds.
USB 24/192 max. Synchronization not specified but probably asynchronous (XMOS).
Lots of measurements in the user manual.
D/A Converter IC ESS Technology ES9018 Sabre Reference 32-bit DAC
THD+N 0.0005% @ 1KHz, 0dBFS
SNR 125 dB, A-weighted, 2.2 Vrms
Channel Separation 140 dB @ 1KHz, 130 dB @ 20KHz
Digital Input Resolution and Sample Rate
USB : 24 bits / 44.1K, 48K, 88.2K, 96K, 176.4K, 192KHz
COAX : 32 bits / 44.1K, 48K, 88.2K, 96K, 176.4K, 192KHz
Unbalanced stereo, RCA jacks with gold-plated contacts
Balanced stereo, XLR jacks with gold-plated contacts
Output Level 2.2 Vrms (unbalanced), 6.8 Vrms(balanced)
Output Offset 2 mV max
Comes with a ASIO driver for Win
It claims to do 24/192 on OSX without a driver so probably USB class 2 audio.
XMOS USB audio class 2 converter
|Twin Wolfson WM8740 24bit DACs used in dual differential configuration|
|New Anagram Technologies ATF2™ 24-bit/384kHz audio up-sampling / jitter reduction|
|Optional Digital Preamp mode allowing connection directly to power amp or active speakers|
|24-bit/96kHz driverless USB Audio 1.0|
24-bit/192kHz USB Audio 2.0 with ASIO or kernel streaming modes.
USB class 2 driver for Win
|Asynchronous USB transfer|
|Selectable digital filters - linear phase, minimum phase and steep|
|Balanced XLR audio output and RCA phono output|
|Two 24 bit digital inputs (with optical or coaxial for each)|
|External input for optional BT100 Bluetooth receiver - allows audio to be streamed and up-sampled from any paired Bluetooth device|
AES, SPDIF (Toslink & coax), USB
24-bit/96kHz driverless USB input
Supports 24-bit/192kHz USB input using a free Cambridge Audio driver
Unclear if this is asynchronous USB
Twin Analog Devices AD1955 current output DACs used in dual differential mode
Up-sampling (to 24-bit/384kHz) using a 32-bit Black Fin DSP
Output: XLR & RCA
|USB Processor||XMOS Asynchronous processing|
|SP/DIF Input Receiver||Wolfson model #WM8805|
|Digital to Analog Converters||2 X ESS Sabre ES9023|
|Digital Inputs||5 selectable inputs - (2) coaxial (gold plated), (2) Toslink, (1) USB|
RCA analog output (gold plated)
|Input Sample Rates Accepted*||44.1kHz, 48kHz, 88.2 kHz, 96kHz, 176.4kHz, 192kHz|
|Bit Depths Accepted||16 - 24 bit, LPCM 2-ch audio stream|
Toroidal transformer (Digital Supply)
|Signal to Noise Ratio||109dB|
|Noise and Hum||-101 dB below rated output|
|Audio Output Level||2.0V RMS|
|Frequency Response||20Hz – 22KHz|
|AC Power Requirements||120 VAC @ 50/60 Hz
240 VAC @ 50/60 Hz
|Finish||Black powder coated matte cabinet with silver anodized aluminum faceplate standard (black optional)|
|Dimensions||3 1/2" H x 17 1/4" W x 15 1/2" D|
Harmonic distortion: 103 dBV
Signal-to-noise ratio: 115dBV
Dynamic range: 118dBV
1 x USB HD with DSD decoding (DoP), 44.1 kHz to 192kHz, 16-32-bit (future 384kHz-ready). USB driver for Win
1x Coaxial 44.1 kHz/ 384kHz-ready, 16-32-bit
Outputs: 2x RCA phono
Power supply: 12v 1A 2.1mm connector. 100-240V - 50/60Hz, 1A wall adapter supplied
Dimensions: 160x70x40mm (WxHxD)
USB DAC with analogue out (RCA), headphone out and Toslink.
inputs: TOSlink 24/96, S/PDIF coaxial, Asynchronous USB 24/192
Output: RCA 2.3Vrms / XLR 4.6mV
Noise floor (20Hz-20kHz): <-145dB
Frequency Response: 0.5Hz-48kHz
32 bit stereo D/A converter / 32 bit pre-amp / Dual mono
|Maximum Output level||2.2Vrms (1 kHz, full scale, 10kΩ)|
|Signal-to-Noise Ratio (S/N)||115 dB|
|Total harmonic distortion||0.001% (1kHz)|
|Digital Input||XLR,RCA,Optical, Async USB 24bit/192kHz|
|Power consumption||7 Watt|
|Weight||10.4 kg (21 lbs)|
DAC with volume control and headphone out.
DAC supporting both adaptive and asynchronous mode
|Amplifier Structure : Low pass filter with 2Vrms output
|Power Structure : High frequency switching DC-DC regulator
|USB Support Format :
|16/24 Bit : 44.1kHz / 48kHz / 88.2kHz / 96kHz / 176.4kHz / 192kHz
|Digital Interface : Direct I2S data format transmission (MAX support up to 192kHz-24bit over 1 meter CAT-5E cable)
|Operation Mode : Support Adaptive and Asynchronous mode for audio stream transmission
|DAC Chip : WOLFSON - WM8740
|USB Chip : TENOR - TE8802
|LPF OP : NS - LM4562
|dB-Weighed Frequency response (From 40Hz to 15kHz) : 40Hz +0.02dB, 15kHz -0.12dB
|Noise level (1kHz, A-Weighted) : -106.7dB
|Dynamic range (1kHz, A-Weighted) : 106.7dB
|THD% : 0.012%
|Stereo crosstalk : -102.7dB
|Housing dimensions : 117 x 80 x 50 mm (D x W x H). Housing only without parts 'sticking out' like connector parts, swithes, etc.
|Weight : 286 gram (without the external power supply)
Headphone amplifier, DAC, monitor controller
Portable USB DAC with volume control and headphone out.
- True 24Bit/192K USB-DAC, supports bit for bit decoding.
- Asynchronous USB transfer
- WM8740 DAC chip
- Up to 24Bit/192K coaxial output
- RCA output and Line out.
- Built-in +/- 5V class A headphone amplfier that run off of USB power
- Full aluminum case
- Measures 60W*93L*22H (mm), and weights 108g
- Comes with USB Cable, and Leather pouch
Pre-amp with line out and headphone out.
ESS Hyperstream Chipset
|Signal to Noise Ratio:||>111dB(A)|
|Total Harmonic Distortion(THD):||<0.005%|
|Jitter:||Below measurement limit|
|Frequency Response:||3Kz to 33KHz + 0.1dB/0.3dB|
|Signal to Noise Ratio:||>97dB(A)|
|Total Harmonic Distortion:||<0.003%(400mV/300R)|
|Power Consumption:||< 2.5W|
DAC with a tubed output stage (ECC-81/12AT7)
USB support up to 32 bit / 384 kHz
Supports DSD over USB
Driver for Windows
- Spdif IEC-958 as RCA connector / 192 Khz 24 bit
- Spdif IEC-958 as BNC connector / 192 Khz 24 bit
- AES-EBU AES-3 as XLR connector / 192 Khz 24 bit
- Opto toslink digital input / 192 Khz 24 bit
- Asyncronous USB / 384 Khz 32 bit
- Word Clock
Unbalanced output / 2.5 volt 250 ohm
Non oversampling DAC with R2R architecture.
Digital Filers: None.
User selectable Analog Filter: -3dB @ 100K Hz.
THD: Better than 0.01%
USB 2.0 compatible input
- Jitter free asynchronous data transfer (udc1 as master)
- Bit transparent drivers for Mac and PC operating systems
- Precision master 3ps crystal oscillator
- 24bit/192kHz Burr Brown digital - to - analogue converter
- True class A, fully discrete analogue circuits with zero negative feedback
- Ultra short signal path
- Balanced analogue outputs with PCB-mounted gold-plated Neutrik XLR sockets
- High current output stage
Frequency response 1Hz - 24kHz +0.1dB -0.5dB
Distortion and noise <0.01% 10Hz - 20kHz at -10dB
Output level 4V rms balanced
Output impedance 150 Ohms
Mains voltage 115V, 230V factory set
Dimensions (H x W x D) 55 x 165 x 224 mm
Pre-amp with USB and SPDIF inputs and RCA and headphone out.
USB input uses the M2tech OEM circuit (Win only) but a new receiver using the XMOS XS1-L1 is planned allowing for full USB Audio Class 2 support (Win, OSX, Linux).
DAC: TI/Burr Brown PCM1794A with TI/BB4192 sample-rate converter.
Upsampling to 192kHz, regardless of input rate. Master clock oscillator with 3ps periodic jitter. Passive I/U conversation with 0.1% precision resistors, zero feedback.
Headphones amplifier: Full discrete construction. NO OPAMPS. NO CHIPS. Volume control with selected blue Alps attenuator. 6.35mm phone jack output. 1000mW continuous sine power output. 1Ohm output impedance. Suitable for 32 – 600 Ohms cans.
44.1, 48, 88.2, 96, 176.4, 192kHz, (plus 32kHz S/PDIF)
Up to 32bit, (24bit S/PDIF)
1Hz - 24kHz +0.1dB -0.5dB
Distortion and noise:
<0.01% 10Hz - 20kHz @ -10dB
2 x 500mW continous @ 32 Ohms
115V, 230V factory set
Dimensions (H x W x D):
55 x 165 x 224 mm
The USB input is not UAC2 (USB Audio Class 2) compliant but uses the M2Tech proprietary drivers for Win and Mac. A new receiver using the XMOS XS1-L1 is planned allowing for full UAC2 support (Win, OSX, Linux).
DSD 1-bit @ 2.8224 MHz, 5.6448 MHz (when used with an ASIO 2.1 DSD driver) over USB.
PCM 16, 20 & 24-bit @ 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz (when used with a PCM driver)
Driver for Windows
RCA and XLR out.
UAC2 compliant async USB DAC up to 32 bit / 352 kHz
Input 1 x USB A type male
Output 1 x 3.5mm stereo jack socket I/O
44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4khZ, 192kHz, 352.8kHz, 384kHz
Resolution: 16 up to 32 bit
Output voltage: 2.0Vrms @10kOhms
Frequency response: 5-22kHz (fs=44.1kHz) / 5-150kHz (fs=384kHz)
THD+N: 112dB (@ 1kHz, A-weighted)
Dimensions: 8.8(d) x 1.4(h) x 2(w)
Power Supply: 5V DC from USB bus
Small portable USB DAC with analog volume control on the headphone out, fixed line out combined with Toslink out.
Non oversampling dac.
Dual mono, 8 Dacs pro channel in differential mode.
Inputs: 2x optical Toslink, Coaxial 1x BNC and 1x RCA.
Optical 44 - 96 kHz sampling rate .
Coaxial , USB and AES/EBU: 44 - 192 kHz sampling rate.
AES/EBU module optional (€ 168.00)
USB module optional ( € 168.00).
The USB input is not UAC2 (USB Audio Class 2) compliant but uses the M2Tech proprietary drivers for Win and Mac.
RCA : 2 Volt RMS full scale.
XLR: 4 Volt RMS full scale
Jitter: < 35 pico Seconds
1Hz - 20 khz - 2.5 dB 44.1 kHz sampling rate.
1Hz - 65 kHz - 3dB 192 kHz sampling rate.
Distortion: 0.03 % THD
Noise :-130 dB related to 2 Volt RMS output
Various models including one with headphone and pre-amp function.
A tread on a forum including Michal from Mytek.
Micheal Galusha did some measurements. He found some spikes at 12,24 and 36kHz.
KSTR found the same results.
35-bit 844kHz DAC and Digital Preamp
Running at 108MHz, the M51 resamples the incoming pulse code modulated (PCM) signal and converts it to a pulse width modulation signal (PWM) with a sampling rate of 844kHz. Operating in a differential mode with double precision, the M51 has state-of-the-art specifications for low noise and freedom from distortion. The extreme headroom afforded by the 35-bit architecture allows for a DSP-based volume control that does not reduce resolution. Even with 24-bit high definition signals, the output can be attenuated by 66dB (very, very quiet) before bit truncation begins.
Rated Distortion (THD+N with AES 17 filter) <0.0005% (0dBFS)
IMD Distortion 0.0001%
Signal/Noise Ratio <-125dB (ref. 0dBFS 2V out)
Channel Separation >-115dB (ref. 0dBFS Volume -1dB)
Sample Rate 32kHz to 192kHz (USB and digital S/PDIF)
Frequency Response ±0.5dB (ref. 20Hz - 96kHz sample rate)
Output Level 2V (ref. input 0dBFS)
Integrated stereo amplifier
3 analog line in + phone (MM/MC)
Digital inputs: AES/EBU, SPDIF (coax and optical), 24/192 async USB
Output: 140 Watt/channel
DAC/preamp/headphone amp with volume control and defeatable tubed output.
|Digital Inputs:||1 USB (asynchronous 24/192)
1 AES/EBU (XLR)
2 Coaxial (RCA)
2 Optical (Toslink)
|Digital to Analogue Converter:||ESS Technology Sabre³² Reference ES9018 32-bit DAC|
|Input Word Length (maximum):||32-bit (AES/EBU, Coaxial, Optical)
|Input Sample Rate (maximum):||192kHz (all inputs)|
|Analogue Inputs:||1 Balanced/Unbalanced (selectable)
1 Unbalanced Line/Home Theatre (selectable)
USB audio class 2 compliant DAC with USB receiver by XMOS.
Inputs: SPDIF (optical/coax) / asynchronous USB
Outputs: AES/EBU, ciax, I2S
Word sync out.
Price: Yen 249,900
USB audio class 2 compliant DAC with USB receiver by XMOS.
24 / 192 Khz
Crystal DSD DAC CS4398 (BD32)
Fully balanced analogue output stage (BD32)
Inputs: 1x asynchronous USB-B, 1x AES/EBU, 3x Optical, 3x Coax S/PDIF
Outputs: 1 pair XLR and 1 pair RCA (both 4,3V)
It allows the user to select 192kHz upsampling or bypass all upsampling.
Input: USB (XMOS), SPDIF (RCA), Toslink
Output: RCA and XLR
Open source drivers for UAC2 and ASIO
The manual contains a lot of measurements.
Each measurement is accompanied by a short explanation, very instructive.
This DAC is linear up to 130 dB. An excellent values allowing for minimal full 22 bits resolution.
Inputs: Coaxial SPDIF, Optical SPDIF, USB (optional)
Input Capability: up to 24/192 for all inputs
Input Receiver, SPDIF: Crystal Semiconductor CS8416
Input Receiver, USB: C-Media CM6631. Drivers for Windows 8, 7, Vista, and XP
D/A Conversion IC: AKM4399, no upsampling
Analog Summing, Filtering: Fully Discrete, JFET differential topology
Output: RCA (single-ended)
Output Impedance: 75 ohms
Ultra low jitter local master clock <3pS
True asynchronous mode operation
USB Audio Class 2.0 compliant
PCM playback up to 192kHz
DSD playback of DSD64 and DSD128
Compatible with DoP v1 specification
Custom made USB to DSD and PCM module
Support for Mac OS X without special driver (10.6 and 10.7), support Audirvana Plus "Direct" and "Integer" modes
Support for Linux without special driver (Alsa version 1.0.24 or later)
Support for Windows XP, Vista and Win 7 (32 and 64 bit), driver (WDM and ASIO) will be provided
RCA unbalanced outputs
XLR balanced outputs
Output impedance: <50ohm unbalanced, <100ohm balanced
Output voltage: 2V Unbalanced, 4V Balanced
DAC with volume control (defeatable) and headphone out.
Supports both USB audio class 1 and 2.
For USB Audio Class 2 it is possible to select either synchronous or asynchronous transmission; a special driver is required for this.
32-Bit, 384 kHz Sigma Delta, 8-times oversampling, double-mono-quadruple
3rd order phase linear Besselfilter, switchable 60 kHz or 120 kHz
2 Hz - 20 / 22 kHz (44.1 / 48.0 kSps)
2 Hz - 40 kHz (88.2 / 96.0 kSps)
2 Hz - 80 kHz (176.4 / 192.0 kSps)
Total harmonic distortion
< 0,001 %
Signal noise (A)
2,5 Veff / 22 Ohm fixed. 0 ... 2,5 Veff variable
5,0 Veff / 22 Ohm fixed. 0 ... 5,0 Veff variable
1 x coax, IEC 60958 (CDDA/LPCM)
SP/DIF (16 - 24 Bit):
4 x co-ax, 1 x BNC, 1 x AES/EBU up to 192/24, 1 x TOS-Link up to 96/24
1 x USB with USB Audio Class 1 (USB full Speed) up to 96/24, adaptive mode
and USB Audio Class 2 (USB high Speed) up to 192/24 asynchronous mode (drivers available)
R2R DAC with volume control and headphone out.
Also available with active 2 or 3 way crossover.
DAC/digital preamplifier with digital inputs, balanced analog outputs, digital volume control, and a headphone out.
Class-A tube headphone amplifier with asynchronous 24/192 USB Audio Class 2 input.