SGA1 is a professional-grade HPA & PRE.
SGA1 FAQs:
Q1: Are the PRE and HPA outputs at the same time？
A1: No. PRE and HPA have separate signal paths. 
Q2: Are the HPA 4-Pin and 4.4mm balanced output at the same time？
A2: Yes. But they can not be used at the same time. 
Q3: Does SGA1 has a memory function？
A3：Yes. The state of each input and output as well as the corresponding volume and gain values can be memorized.
Q4: How to adjust the volume quickly？
A4: When the SGA1 detection knob is turned rapidly, it will automatically enter the mode of rapid volume adjustment, and when it is detected that the knob is turned slowly, it will enter the mode of fine adjustment.
Q5: Is the gain continuously adjustable？
A5: Yes. Gain is adjusted by 0.5dB/step. 

SGD1 is a professional-grade DAC.

SGD1 FAQs：
Q1: What other functions does SGD1 WiFi have besides upgradeing the system firmware？
A1: The WiFi function of SGD1 is only used to upgrade the system software, without any other functions, and there is no data collection behavior.
Q2: Are the XLR and RCA output at the same time?
A2: XLR and RCA are output at the same time, and the two interfaces can be connected to the power amplifier equipment (headphone amplifier/power amplifier) of the corresponding interface at the same time.
Q3: Can SGD1 be used as a pre-amp?
A3: The SGD1 is a high-performance DAC that can also meet the requirements of pre-amp applications.
Q4: Can I bypass the volume control directly?
A4: DAC internal modulators, filters, and volume controls cannot be bypassed,which is determined by the DAC chip.
Q5: Can SGD1 be used as a pure decoder?
A5: SGD1 can be used as a pure decoding device, adjusting the volume to the maximum.
Q6: Is the volume adjustment and mute function valid for all outputs?
A6: Volume adjustment and mute functions are only valid for analog output and not for digital output.
Q7: How does SGD1 handle DSD, direct output or PCM conversion?
A7: When the DSD source is playing, the DSD audio stream directly into the DAC chip with no transcoding in the middle.
Q8: What is the use of installing Thesycon custom driver?
A8: The customized USB driver supports PCM768KHz/DSD512 (Native). If you use the built-in driver of the system, there may be problems with high-spec audio sources that cannot be played.
Q9: How can I see the format of the audio source being played?
A9: Information about the currently playing audio source is displayed on the custom-driven control panel installed on the PC side.
Q10: Does SGD1 have a memory function? 
A10: The volume and filter mode of each input source of SGD1 can store memories separately and the next power-on returns to the last setting. 
Q11: How to reset the system?
A11: Press and hold the button for more than 6 seconds, all indicators are on and reset to the default power-on state.
Q12: The default volume for SGD1 and the adjustment of the stride.
A12: The default volume is -64dB, the encoder adjusts the volume stride is 0.5dB/Step, the maximum volume is 0dB. The volume of SGD1 can be realized by turning the knob quickly or long pressing
remote control +/-.
Q13: How can I upgrade my SGD1 DAC?
A13: There are two ways to upgrade: mobile phone hotspot and mobile phone APP (Esptouch). Please refer to the SGD1 Upgrade Guide for details.
Q14: What is the power consumption of the whole machine?
A14: <9W.
Q15: When does WiFi turn on and off?
A15: SGD1 will configure the WiFi network before connecting each time it powered on. If the network exists, it automatically detects if there is new software and update, and then turn off the WiFi function,
if the network does not exist, the WiFi will be turned off one minute after powering on.
Q16: When does SGD1 Bluetooth turn on?
A16: Bluetooth for SGD1 periodically scans the connected devices to ensure that they are automatically connected.
Q17: What formats of decoding does SGD1 Bluetooth support?
A17: Support APTX / APTX LL / SBC / AAC and other format.
Q18: What decoder chip does SGD1 use, and how many pieces are used?
A18: Each SGD1 uses 2 ES9038Q2M as audio decoding chips.
Q19: What operating systems does SGD1 support?
A19: Compatible with multiple operating systems Windows/iOS/Android/Linux/Volumio.
Q20: Has IMD Hump been resolved?
A20: Yes, all our products are hump-free.
Q21: Which drivers to use? XMOS or Thesycon?
A21: XMOS has removed and no useless.Thesycon support DSD512 and PCM768KHz.
Q22: How do I confirm what firmware I am running, or if the OTA upgrade succeeded?
A22: The user cannot see the version of the software. Under normal upgrade operation, if no new 
upgrade occurs,  and judge as the latest version of the software.
Q23: Where can I install the latest drivers?
A23: Please download.
Q24: What is the impedance of the XLR/RCA output?
A24: XLR output 200 Ω and RCA output 100 Ω.
​Q25: How many output voltages for maximum volume?
A25: XLR 4.0Vrms and RCA 2.0Vrms.

LA-QXD1 DAC for the home and office.

LA-QXD1 FAQs：
Q1: Can I use the USB port that comes with my computer to power the LA-QXD1?
A1: The PC's own USB port for power supply is not enough to support the normal operation of LA-QXD1.
Q2: Power consumption of the whole machine.
A2: <4W.
Q3: What is the impedance of the XLR/RCA output?
A3: XLR output 200 Ω and RCA output 100 Ω.
Q4: Does the LA-QXD1 remember the volume and different filter choices for each input?
A4: LA-QXD1 does not have memory function, it will return to the default state after powering on/off.
Q5: How can I switch between the different filter modes of the LA-QXD1 DAC?
A5: Long press the Mute button for 2 seconds to select the filtering mode, and each long press switches one filtering mode. The switch order is APOD-BRIC-FAM-FAM-FAL-HYER-SLM-SLL.
(Note: Switch to the filter mode you want to play, and don't need to press a different button to confirm). 
Q6: How can I know which filter is selected? Is there is a reference for the filters and the led combinations?
A6: The three LED indicators of TOS/COAX/USB will be displayed in combination. Refer to the LA-QXD1 DAC filter mode truth table.
Q7: LA-QXD1 default volume and adjust the stride?
A7: The default volume is -64dB, the adjusted volume stride is 2dB/Step, and the maximum volume is 0dB.
Q8: How do I determine if the volume of LA-QXD1 is turned up to the maximum?
A8: Press and hold the volume "+" to quickly adjust the volume, and the corresponding channel light flashes when you adjust the volume until the volume is up to the maximum to stop flashing.
Q9: How many output voltages for maximum volume?
A9: XLR 4.0Vrms/RCA 2.0Vrms.
Q10: Where can I download the latest firmware and drivers?
A10: Please download.
Q11: How can I upgrade the firmware of my LA-QXD1 DAC?
A11: Please refer to the LA-QXD1 Upgrade Guide for details. 
Q12: Can I connect my headphones directly to LA-QXD1?
A12: It is not recommended to use as a headphone amplifier.
Q13: What's the purpose of the downloadable Thesycon Driver?
A13: To support PCM768KHz and DSD512.
Q14: Do I need drivers When using Windows XP, indows7/8/8.1/10, MAC OS, OSX, Linux?
A14: Windows 8.1 and earlier versions require a driver. Windows10, MAC OS, OSX , Linux does not need driver.
Note：All Windows platforms that need to support PCM768k and DSD512 must have our official custom drivers installed.
Q15: Is the SONCOZ LA-QXD1 DAC compatible with 32 kHz sample rate via SPDIF?
A15: Yes.
Q16: What about warranty?
A16: please refer our official website.
​Q17: What is the default filter mode of the LA-QXD1?
A17: The default filter mode of the LA-QXD1 is the Apodizing Linear Fast Roll-Off Filter (APOD).