SINGXER SDA-6 PRO2 Balanced DAC

Singxer's SDA-6 PRO2, the second version of the SDA-6 PRO, is a high-fidelity balanced DAC. It features numerous improvements over its initial version, and integrates high-end components selected for their audio performance: two AKM AK4499EX DAC chips, AK4191 digital filter, AK4118 SPDIF interface and XU-316 USB XMOS interface.

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2 Years warranty

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SINGXER SDA-6 PRO2 Balanced DAC 2x AK4499EX AK4118 FPGA XMOS I2S LVDS 32bit 768kHz DSD512

SINGXER SDA-6 PRO2 picture

Singxer's SDA-6 PRO2, the second version of the SDA-6 PRO, is a high-fidelity balanced DAC. It features numerous improvements over its initial version:

  • The SDA-6 PRO2 uses two AKM AK4499EX DAC chips coupled to an AK4191 digital filter for its digital-to-analog conversion work
  • The USB interface's crystal oscillator uses a femtosecond clock coupled with an internal constant-temperature system for enhanced stability
  • The USB interface has been upgraded to a third-generation XMOS XU-316 USB interface supporting 32Bit 768kHz PCM and DSD512
  • The power supply has also been upgraded to an ultra-low-noise system, reducing the level of low-frequency distortion
  • Digital preamplifier supports volume control, analog gain up/down, screen brightness adjustment and screen-free playback

SDA-6 PRO2: A high-end architecture

The architecture of the Singxer SDA-6 PRO2 balanced DAC gives it a level of sound reproduction that will not leave you indifferent. It incorporates top-of-the-range components selected for their audio performance. As mentioned above, its digital-to-analog conversion stage is based on two AKM AK4499EX DAC chips coupled with the AK4191 digital filter. These support high-resolution streams up to PCM 32Bit 768kHz and native DSD up to DSD512. The DSD stream operates in NOS (Non Over Sampling) mode, without passing through the AK4191 filter, in order to respect the original signal as closely as possible.
The USB interface is an XMOS XU-316 interface, and SPDIF reception features a dedicated AKM AK4118 chip. In addition to these high-fidelity components, an STM32 microcontroller is in charge of efficient data processing, and a Xilinx FPGA handles clock management and digital audio stream processing.
Regarding the SDA-6 PRO2's output circuitry, it adopts 4 discrete Class A output channels featuring a DC-balanced non-loop negative feedback architecture. The USB input oscillator uses a CCHD-957 femtosecond clock for minimal jitter, combined with 4 independent ultra-low-jitter oscillators for the rest of the circuit. The analog stage incorporates Mundorf film capacitors, which deliver excellent musicality.

SDA-6 PRO2: a low-noise power stage

The power supply stage features a customized 40W O-type transformer with 4 independent output windings. In addition, the digital-to-analog conversion stage is powered by a new low-noise system (0.3uVrms). An internal switch handles the selection of 115V or 230V AC input voltages for the Singxer SDA-6 PRO2.

Inside photo of SINGXER SDA-6 PRO2

SDA-6 PRO2: extensive connectivity

The Singxer SDA-6 PRO2 features a complete range of inputs and outputs, enabling it to be integrated into most audio systems. Inputs include USB-B (XMOS), I2S LVDS via HDMI, Toslink optical, coaxial, AES/EBU and BNC. The device also features a CLK input on a BNC connector for external clock connection. Outputs include unbalanced stereo RCA and balanced stereo XLR.

Photo of SINGXER SDA-6 PRO2 connectors

Technical characteristics

Specifications
Product typeBalanced DAC
DAC chip2x AKM AK4499EX
Inputs1x I2S LVDS HDMI (Standard pin out PS Audio)
1x USB-B
1x Optical Toslink
1x Coaxial
1x AES/EBU
1x BNC
1x CLK (via BNC connector)
Outputs1x XLR stereo balanced
1x RCA stereo unbalanced
Supported sample ratesUSB, I2S: PCM up to 32bit 768kHz, native DSD up to DSD512, DSD DoP up to DSD256
SPDIF, AES/EBU: PCM up to 24bit 192kHz, DSD DoP up to DSD64
SPDIF input impedance75Ω
AES/EBU input impedance110Ω
Output levels (0dBFS)PCM : RCA 2.6V RMS, XLR 4.6V RMS
DSD : RCA 2.6V RMS, XLR 4.6V RMS
Output impedanceRCA : 22Ω
XLR : 45Ω
Frequency response20Hz - 20kHz ±0.1dB
SNR131dB (20Hz-22kHz, A-Weighting)
THD+N (1kHz, 0dBFS)0.00012% (-118dB) @ fs=44.1kHz, PCM, 20Hz-22kHz, A-Weighting
Dynamic (1kHz, -60dBFS)131dB @ 20Hz-22kHz, A-Weighting
Channel separation> 130dB @ 1kHz
Général
Supply voltage115V-230V AC (selectable by internal switch)
Dimensions (excl. feet and connectors)262 x 220 x 46mm
Weight2.7kg
ColorBlack
Package1x Singxer SDA-6 PRO2
1x USB cable
1x IR remote control
1x Power cable
SDA-6 PRO2 test measurements
 
Data sheet
InputSPDIF
InputI2S via HDMI
InputAES/EBU
InputUSB
InputOptical
InputBNC
OutputRCA
OutputXLR
DAC / ADC ChipAK4499EX
Max sampling rateDSD512
Max sampling rate768kHz
ColorBlack
NetworkingNo
Remote ControlYes
 
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Average votes
5.0 / 5
2 reviews
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Note :
 5/5
Date :
Excellent
Très belle qualité, son excellent pour ce prix.
Branché sur un PC HDG générant des interférences sur tous les autres DAC testés, ici, l'entré USB est filtrée admirablement.
 (0)
 (0)
This review has been posted for SINGXER SDA-6 PRO2 Balanced DAC 2x AK4499EX AK4118 FPGA XMOS I2S LVDS 32bit 768kHz DSD512
Note :
 5/5
Date :
Absolutely neutral, detailed sound. Real High-End.
I have this DAC in use for two months now, connected via XLR to Preamplifier Topping A90D and Neumann KH 420 G active speakers.
Source is a notebook running foobar, connected via USB, source material is PCM from 16/44.1 to 24/192.

The build quality of the device is very good. Remote control is the same type as every Gustard/Topping/SMSL remote.
Unfortunately, the manufacturer does not provide any user manual, so I found the menu control by accident (press "D-Filter" for 3 seconds).
Stand-by mode does not exactly switch off the device, but reduces the power consumption from 15 watts to 10 watts, so I prefer to use the rear power switch when the DAC is not in use.

I did intensive side-by-side listening tests with Gustard X16/X18/X26 pro, Topping D90MQA/E70V/D30 pro, SMSL SU-10 and Teac UD-501.
A comparison to the lower-priced DACs I mentioned above would not be fair, so I will describe my personal impressions of the sound differences between this device, SMSL SU-10 and Gustard X26 pro.
To my ears, in my system, the SDA-6pro2 performs great (I use the default digital filter, "short sharp"). Sound is precise absolutely neutral and well-balanced in every regard. Tonality, soundstage, dynamics. The amount of detail is stunning, in every frequency range. High frequency are a more on the brilliant side, textures in human voices are clearly audible, without any hint of harshness. Of all the DACs compared it with, this is the most neutral sounding.
For years, I used to prefer ESS-based DACS, to my taste AKM-based DACs sounded always a bit to soft- but the Singxer really changed my mind. It combines the dynamics I like on the ESS chips with the natural and detailed sound of the AKM chips.

In comparison, the SMSL SU-10 lacks a bit of detail retrieval in every frequency range, mid-bass is a bit pronounced and female voices tend slightly to "shout" when listening at high volume levels. The soundstage of the SU-10 is huge and also somewhat diffuse.

The difference in sound compared to Gustard X26 pro is a matter of taste. SDA-6pro2 detail retrieval is on par with X26 pro. Bass definition of Singxer is better, but X26 has more pressure and wall-shaking subbass. In short, X26 pro sounds more spectacular due to punch and dynamics, but acoustic instruments and human voices tend to sound a bit artificial in comparison to SDA-6pro 2, which sounds more natural and refined.

I highly recommend this DAC for customers who want simple, perfect sounding DAC and don't need comfort functions or a fancy user interface.
 (3)
 (0)
This review has been posted for SINGXER SDA-6 PRO2 Balanced DAC 2x AK4499EX AK4118 FPGA XMOS I2S LVDS 32bit 768kHz DSD512
 
SINGXER SDA-6 PRO2 Balanced DAC 2x AK4499EX AK4118 FPGA XMOS I2S LVDS 32bit 768kHz DSD512
Singxer's SDA-6 PRO2, the second version of the SDA-6 PRO, is a high-fidelity balanced DAC. It features numerous improvements over its initial...

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