All of us from YuLong proudly present the ADA1 (Amplifier Digital-to-analogue) with breaking through DoP128 and PCM 384KHz support over SPDIF, very analogue sounding, and high performance-to-cost ratio all in one unit backed by our years of experience in sound refinement, design and creativity.
We believe ADA1 will become your favorite music playback device with these advantages: Powered by dual high performance AK4490 DAC chips in mono mode; DSD decoding supported by all inputs; JFET input, DC-coupled, fully discrete class-A headphone amplifier; optional WiFi adaptor; A4 sized and flexible connections.
Key Features of ADA1
● DoP64 support over SPDIF/Optical/AES.
● DoP64 Native DSD64/128/256 and PCM 16-32bit, 32-KHZ over USB.
● Up to PCM384 and DSD 64/128 over WiFi. Direct push with iOS and Android.
● Ultra-Low jitter PLL clock (<50PS).
● Dual AK4490 analogue sounding DAC.
● Adjustable digital filter .
● Digital attenuator in 80 steps.
● High impedance JFET input, DC-coupled, fully discrete class-A headphone amplifier.
● Balanced output with 20Ohm and attenuator can drive active speakers and balanced headphones.
● Optional balanced headphone adaptor.
● WiFi and headphone module can be shut off for a pure DAC mode.
● Touch screen, auto-save, auto-dim and intuitive controls.
● Durable aluminum enclosure and feet.
● Versatile global voltage 110-240V by user accessible switch.
The input digital signal is buffered and shaped and then demodulated by Saviaudio SA8804 with its ultra low jitter reference clock, and the decoded by two AK4490s in mono mode for left and right channels respectively. Output buffer utilizes OPA1632 which impedance is low enough to drive headphones directly.
Precisely designed power supply and layout ensured very high S/N ratio and distortion specifications. A Plitron transformer supplies the power needed for different sections together with primary regulators followed by ADP124 precision low Low-dropout regulators (LDO). ADM7150 precision LDOs with only 1.0 μV rms noise level were used for the analogue reference voltage (V_Ref) for AK4490.
Ultimate USB performance was achieved by carefully designed circuits surrounding Saviaudio SA9227 including a customized ultra low phase noise clock.
Headphone amplifier is fully DC-coupled and fully discrete, JFET input class-A design with low impedance high current output stage powered by MJD243/253 transistors. Carefully matched and biased for most natural and musical listening experience.
Optional WiFi module is powered by Saviaudio SA9800 which supports playing domestic music files on iOS or Android devices, or DLNA streams over computer or NAS. All these playbacks support DSD format and PCM up to 32Bit/384KHz.Optional WiFi module is powered by Saviaudio SA9800 which supports playing domestic music files on iOS or Android devices, or DLNA streams over computer or NAS. All these playbacks support DSD format and PCM up to 32Bit/384KHz.
1、LCD screen shows the working status. Brightness will be turned down and buttons will be locked after 20 seconds without operation.
2、Input select button. Press to cycle from Coaxial, Toslink, AES, USB and WiFi (when equipped). LCD display will show the sampling rate when a valid digital signal is detected. will be displayed in the case of a DSD format is recognized.
3、Volume - button. Short press to decrease the output level by 1dB, or long press for continuous reduction. When in pure DAC mode, a long press will turn on the pre-amplifier and headphone amplifier.
4、Volume + button. Short press to increase the output level by 1 dB, or long press for continuous Increase. When in pure DAC mode, a long press will turn on the pre-amplifier and headphone amplifier.
When the output level is 0dB, release and followed by a long press to the volume + button will turn on the Pure DAC mode, which shuts off pre-amplifier and headphone amplifer.
The buttons and display will be locked after 20 seconds without operation. Press any button to light up the display and disable the button lock.
A long press to the input button will allow you to choose a filter mode from Sharp or Slow. Sharp mode has a flat frequency response while Slow mode has slight roll off in high frequency. Please experience and choose one that you prefer.
When equipped with WiFi module, press Input button and Volume + button in the same time for 1 second will toggle WiFi function on and off. Press Volume - and Volume + button in the same time for 1 second will reset the WiFi settings.
!!! Warning: ADA1 outputs a full scale signal in pure DAC mode. You must have a volume control in your system, otherwise the output level could be dangerous high, and might permanently damage your equipment and hearing
!!! You may also face angry family members, neighbors and pets! We don't response to any damage under such condition.
!!! Warning: Please turn the volume to minimum before connecting or turning on equipments. It may sound dangerous loud!
6、Single-end analog output
7、Balanced analog output
!!! Warning: Do not use regular XLR-RCA conversion adapters or cables , which normally short pin 3 to ground. You will damage the output stage!!! We don't response for such damage. Make sure pin 3 is disconnected if you want to use the balanced output as unbalanced.
8、COAX SPDIF digital input
9、Optical SPDIF digital input
Note: For some device, ADA1 many not work for signal over 192KHz, because the low quality optical digital signal.
10、AES digital input
11、USB input: Please install the driver when using Microsoft Windows operating system.
Download address: http://yulongaudio.com/en/down.asp
Please configure the software player to allow automatic sample rate selection. e.g. for KS, WASPI plugin, please set the player to DOP 1.0(0xFA/0x05) when playing SACD, DSD. When the setting is correct, LCD should display "input USB DSD"
12、Main power voltage switch: Please set it to your local voltage。100-120V/220-240V
!!! WARNING: Please set it to the correct voltage. Any damage caused by mistake will not be covered.
13、Interchangeable fuse jack. A second fuse is provided.
14、Main power input.
* Before using ADA1, it's better to warm up for at least 15 minutes. Please make sure to allow the air to circulate and to use the headphone with class A to amplify, it is normal that there is a little warm on the surface of ADA1.
* Please use high quality USB cable. Don't connect ADA1 via a USB hub, or extension cable (for example most USB ports in the front of tower case).
* The AC power supply need to be properly grounded, otherwise it is not safe to use, at the same time the noise produced by the the other electrical equipments will be passed to ADA1 from power cord, it is also possible that the loop noise will be produced among the grounding wire, PC, USB and ADA1.
WiFi module instructions
There is an optional WiFi module to enable transferring digital audio to ADA1 through WiFi.
When equipped with WiFi module, press Input button and Volume + button in the same time for 1 second will toggle WiFi function on and off. Press Volume - and Volume + button in the same time for 10 second will reset the WiFi settings.
AP mode and Client mode is available in WiFi mode. You can connect your device to ADA1 directly under AP mode, or connect ADA1 through your LAN via a router.
Connect ADA1 in AP mode
1、Power up ADA1 and choose input to WiFi. Wait until “WiFi in stanby”is shown on the LCD display.
2、Go to WiFi setting in your phone or tablet, search for WiFi device named YULONG Audio, connect it, open your music playback software and choose YULONG Audio as default output/rendering device, and now you can enjoy music played back from ADA1.
3、AirPlay is recommended for iOS and Bubble UPnP is recommended for Android system. Of course you can choose your favorite playback software, as long as it can define the output device、Support DLNA。
Connect ADA1 in Client mode
It might be more convenience when you add the WiFi module in your local network
iOS user can search the APP named YULONG , while Android user can download the APP from:
In the first use please confirm the WiFi module connected to ADA1'S USB port and WiFi power supply port, then turn on the power of ADA1. Then go to WiFi setting in your phone/tablet, search for WiFi device named YULONG Audio, connect it, and open the installed APP.
When complete successfully, now you can use ADA1 as output device in the playback software.
If the setting was wrong, please Press Volume - and Volume + button in the same time for 1 second will reset the WiFi settings
If you can't install the APP, you can connect the WiFi module by access to IP address 192.168.50.1.
You can create a media server from your computer or your NAS, and play music from media server by choosing it in the playback software. For example you can create a media server using Foobar2000 via UPnP. Please set up media server by yourself.
If the WiFi connection fails or drops from time to time, if could be caused by channel interference. Please power cycle the WiFi module to reassign a channel.
● DoP64 and DoP128 support over SPDIF/Optical/AES
● PCM 384KHz 24bit over SPDIF/Optical/AES
● DoP64, DoP128, Native DSD64/128/256 and PCM 16-32bit, 32-384KHz over USB
● Up to PCM384 and DSD 64/128 over WiFi. Direct push with iOS and Android。
● SNR: -120dB
● Dynamic Range: 119dB
● THD+N: 0.00045%
● Frequency Response: 20-30KHz-0.15dB
● Crosstalk -120dB
● balancedOutput level: 4.2V
● Headphone amp output power: 600R: 90mW 300R: 180mW 150R: 360mW 32R: 1.68W
● Power consumption: <30W
● size: 248*210*60mm
● weight: 2.8Kg