SINGXER SDA-6 PRO 2 Dual AK4499EX Digital to Analog Convertor (DAC)

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Regular price $1,299.00 USD
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PRO2 new version of the main improvement part:

1. Using AKM fourth generation flagship DAC: AK4191 + two AK4499EX as the main chip for digital-to-analog conversion;

2. USB part of the crystal using femtosecond clock with our self-developed thermostatic tank, to achieve the clock system in a constant temperature environment;

3. XMOS upgraded to the new XU316 chip as the USB Audio program, the highest support DSD512, PCM 768K sample rate.

4. Upgraded with specially optimized ultra-low noise power supply system, completely solved the problem of large low-frequency distortion of AKM DAC;

5. With digital preamp, support volume adjustment, analog high and low gain adjustment, OLED brightness adjustment and off-screen playback;

SDA-6 is a high-performance DAC developed by our Singxer team, which uses AKM's fourth-generation flagship DAC: AK4191 + two AK4499EX as the main chip for digital-to-analog conversion; AK4118 as the digital audio input and receiver chip, using STM32 as the control core of the whole machine, Xilinx's large-scale FPGA as the clock system and the The PCM supports up to 768Khz, and the DSD supports native direct decoding up to DSD512.

The DAC chip adopts two AK4499EX released by AKM in 2022; DSD can be selected as the native direct mode, and the DSD digital stream does not go through the internal digital filter, and works in NOS mode, which is fully in line with the design idea of HQPlayer.

With rich input and output interfaces, including standard USB2.0 input interface, SPDIF with BNC coaxial and AES balanced input, HDMI-I2S input interface, analog output including XLR balanced output and RCA single-ended output; full interface support DSD input.

The SDA-6 PRO supports external clock inputs, of which USB supports 10M clock input and other interfaces support WCK input. In USB mode, it also supports 50 and 75 ohm switchable input impedance.

Main technical features:

1. self-developed adaptive clock system technology, built-in 4-way independent ultra-low jitter audio crystal, configure femtosecond local clock system for USB part, with our self-developed thermostat technology to achieve constant temperature crystal.

2. High-performance digital-analog hybrid phase-locked loop, excellent clock synchronization recovery technology, can significantly filter external digital input jitter secondary PLL;

3. 4-way fully balanced full DC Class A discrete circuit output;

4. large FPGA for digital audio signal processing, self-developed third-generation algorithms, original multi-input channel isolation technology to ensure the purity of each input signal.

5. Built-in 40-watt customized O-type transformer, the output of four independent power supply winding, up to 20 groups of distributed voltage regulator line; which provides the reference power supply for the AK4499EX is a newly developed chao low noise (down to 0.3uV RMS) power supply system.

All versions support switching between 115V and 230V AC voltage with internal toggle switch.


Here is the test data for the production version of the SDA-6 PRO, based on the APX555:


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If a customer would like the order reshipped, they’ll be charged a reshipment fee. Customers may also be subject to a restocking fee of up to 20 percent of the product cost.

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Given the amount of shipping partners we work with and the vast coverage area we serve, there are likely regions with much longer transit times than others. If you have any feedback, suggestions, or problems with the courier of your shipment, please feel free to submit a support ticket via the "Contact Us" button below.

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To determine if your order is eligible for shipment to PO boxes or an APO/FPO address, please contact SHENZHENAUDIO Support.

Estimated Delivery Time

For customers in the continental United States:
5 to 14 business days from the date of shipping

For customers in Hawaii and Puerto Rico:
2 to 4 weeks from the date of shipping
International customers can expect longer shipping times, depending on the country in which they live:

Canada: 1 to 3 weeks from the date of shipping
Australia, New Zealand, Germany, France, and the UK: 2 to 4 weeks from the date of shipping
Other countries not listed above: 3 to 6 weeks from the date of shipping

Please keep in mind that these are rough estimates and shipments can be delayed due to unforeseen circumstances, like postal strikes or severe weather.

If, for some reason, you don’t receive your order within the estimated time frame provided above and suspect that it might be lost in transit, please submit a support ticket from your transactions page and we can look into the order with the courier. Lost-in-transit requests must be submitted to SHENZHENAUDIO Support within 4 months of the date of shipping or before the courier archives the tracking information.

Easy 30-Day Return Policy

If you are dissatisfied with your purchase for any reason, you may return it to SHENZHENAUDIO within 30 days of the received date, subject to the conditions and exclusions below.

Eligibility Conditions

Please read conditions below. If all conditions are not met, SHENZHENAUDIO reserves the right to refuse the return. All returned items must be in new condition, in their original unaltered box (including an intact UPC code) and must include all packing material, blank warranty cards, manuals and accessories. SHENZHENAUDIO can only refund the original purchase price. Shipping and handling fees are nonrefundable.

Defective or Damaged Items

Defective items may be repaired, exchanged or refunded at our discretion for the same model or manufacturer's equivalent model.


Depending on where you live, the time it may take for your exchanged product to reach you, may vary. Please allow 3-5 business days for mail-in exchanges to be processed.

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Once we receive and inspect your item(s), we will credit your account. Please allow 5-7 days for a credit to appear on your account. In most cases, we will issue your refund in the same way you made the original purchase. Please note: we can only refund the original purchase price. Shipping and handling fees are nonrefundable.

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund.


To return your product, you should mail your product to: 4F 405, Building F, No.2 Shangxue Science and Technology North, Bantian Street, Longgang Dist, ShenZhen, 518129 Guangdong, China

If you’ve done all of this and you still have not received your refund yet, please contact us at

pcm: 44.1kHz,48kHz,88.2kHz,96kHz.
[USB and I2S support all sample rates, S/PDIF supports up to 192KHz].
DSD: 2.8 MHz (DSD64) - DoP, native
5.6 MHz (DSD128) - DoP,native
11.2 MHz (DSD256) - DoP,native
22.5792 MHz (DSD512) - native
[USB and I2S support all DSD formats, S/PDIF and AES/EBU support DSD64 DOP mode].
Bitwidth: up to 32 bit over USB and I2S
Up to 24 bit over S/PDIF

Electrical standards for each interface:
1, USB input socket is a standard USB-B type female socket, USB power supply range 4.5V-5.1V;
2, SPDIF interface input standard S/PDIF signal, input impedance is 75 ohms, AES input impedance is 110 ohms;
3, the power input is 115V/230V AC, and the internal power is supplied by a 40-watt customized transformer;
4, I2S input is LVDS level in the form of HDMI interface, compatible with most front-end devices;

Analog output performance:
Output level (0dBFS):
PCM: RCA single-ended output for 2.6V RMS, XLR balanced output for 4.6V RMS
DSD: 2.6V RMS for RCA single-ended outputs, 4.6V RMS for XLR balanced outputs
Output Impedance: 22 ohms (RCA single-ended) / 45 ohms (XLR balanced)
Frequency Response: 20-20kHz +/-0.1dB
Signal-to-noise ratio: 131dB (20-22kHz A-weighted)
Distortion Characteristics:
THD+N (1kHz, 0dBFS) 0.00012% (-118db) at fs=44.1Khz (PCM, 20Hz-22kHz A-weighted))
Dynamic Response (1kHz, -60dBFS) 131dB (20Hz-22kHz A-weighted)
Left/Right Channel Separation >130dB @1kHz




SDA6 PRO 2 * 1
Remote Control * 1
USB Cables * 1
Charging Cables * 1