HiFimeDIY U2 Asynchronous USB DAC

HiFimeDIY U2 Asynchronous USB DAC
Views: 343562 Brand: HiFimeDIY
Product Code: 10000072
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This model is discountinued. Look at the 9018 model instead:

The Hifimediy U2 Asynchronous DAC was developed by DIY (do it yourself} enthusiasts in the purpose of making a really good but cheap dac that could compete against regular commercial DAC's costing many times as much. It utilises a DAC chip from ESS Technology, whose DAC chips is highly regarded. The ES9023 chip is their simplest DAC chip which keeps many of the features of their bigger brothers at a minimal cost.

The Hifimediy U2 Dac works in USB Asynchronous mode using the standard USB Audio protocol. No drivers are needed in Windows, Mac OSX and Linux for up to 96kHz/24Bit Asynchronous transfers.
Asynchronous transfer means that the timing of the data flow is controlled from the device (DAC) instead of from the computer. Computers are not the best to keep a steady clock so it is much preferred to use an external master clock. The Hifimediy U2 is clocked by a 27Mhz oscillator which is buffered by a low jitter PLL1705 as the master clock source.
USB Audio uses Isochronous data transfer in either synchronous, adaptive or asynchronous mode.
* In synchronous mode, the length of a second is defined by the host device. That is, the host will send data at a rate, and the device has to exactly match that rate.
* In asynchronous mode it is the other way around, the device sets the definition of a second, and the host has to match the device.
* In adaptive mode the data flow determines the clock.
The U2 uses the SA9023 USB receiver chip from SAVITECH (not to be confused with the DAC chip ES9023). It accepts 32kHz, 44.1kHz, 48kHz, 88.2kHz and 96kHz inputs at 16 and 24bit. The SA9023 USB receiver is set to work in slave mode with the 27Mhz oscillator is the master clock source, buffered by the PLL1705 chip.
The U2 dac can be used together with the USB Isolator. it will isolate the power from the PC and give a cleaner 5VDC power to the DAC. We have experienced improved clarity in soundstage and separation using this isolator together with the Hifimediy U2 and UAE23 dac's.
- Asynchronous USB transfer
- Output on 3.5mm headphone jack.
- Volume Level is controlled by the normal volume control keys on your computer. (no need to use the volume control inside iTunes etc.)
- No drivers required for Mac, Windows and Linux!
- Normal line level output (2Vrms) when connected to amplifiers/preamps. For headphones the level decreases down to 1Vrms for 32ohm headphones
- Confirmed working with iPad 3 (iOS 6.0.1) using this USB hub:
- Quality TYCO gold plated headphone connector
Additional features:
- The U2 can also work as Asynchronous USB to optical converter when not using the analog output.
Highlights about Sabre ES9023 dac chip:
- The sound go straight out of the DAC chip and into your headphones or amplifier. It is not needed that the sound signal go through a capacitor to remove a DC voltage, there is no DC voltage to remove! This omits the need of a coloring cap which adds costs and reduces sound quality.
- Jitter Eliminator! The ES9023 utilISed patented HyperstreamTM architecture and Time Domain Jitter Eliminator.
- 112db DNR
ASIO driver:
Savitech has released an ASIO driver for the SA9023 usb chip. ASIO drivers can provide lower latency, and is to optional to use. 
Asio drivers is only recommended for advanced users, and is not required for normal audio playback.
It can be downloaded here.
Output levels:
Open 2.2Vrms
4.7Kohm 2.1Vrms
1.8Kohm 1.9Vrms
510ohm 1.5Vrms
330ohm 1.3Vrms
30ohm 1Vrms
Note: Normally amplifier inputs are from 10K to 100K ohm. Normal headphones are from 32 ohm to 250ohm.
5 ( 5 / 5 )
I have successfully connected this U2 DAC on a Galaxy Note 4 with USB-A female to microUSB cable. Fine. I also use the U2 DAC connected to a C.H.I.P. (the 9$ computer) in order to use the C.H.I.P. as a squeezebox-like device (i.e. network music player), connected to my hifi amplifier (the C.H.I.P. can also be squeezebox server... I used the U2 DAC also on a Raspberry Pi to the same goal).
5 ( 5 / 5 )
I received my item 10 days after placing an order....very fast delivery from HK to Croatia! :) Comparing this DAC to Realtek ALC269 chip in my Lenovo Z580....the sound at 50% Windows volume is louder, the bass is deeper and punchier at the same time....also more details are present. No need for an amplifier using my Audio Technica ATH-SJ33 (48 ohm). The case is smaller than I thought it would be. Highly recommended as the first DAC solution and entry into the HiFi world. Best buy for sure! :)
5 ( 5 / 5 )
I have had my DAC for nearly 12 months and all I can say is, (It's Great). Sound is pure, and unlike others here I have had no sound issues with it.On the odd occasion my Windows 7 hasn't recognised it on startup but remove and re-inserting has fixed the problem.It is in use 12 hours a day, I would recommend it to everyone.
1 ( 1 / 5 )
Bought this somewhere in September. The sound is absolutely gorgeous and this really easy too use since the footprint is small. Am a audiophile with many CD player and high end speaker with tube amps for many years. The sound quality coming from this small box is excellent. However recently now it is bugged with a crackling and distorted sound continuously that I am unable to solve. I have plugged it into different pc and notebook- results is the same. Tried it directly with headphone still the same distorted sound. Guess this dac may have quality issue. Felt disappointed with the short life. It is running fine till now. Don't think I will recommend to anyone due to this issue. HIFIME REPLY: it sounds like there is a problem with a capacitor. Please contact us to arrange a replacement, we will send it to you for free, there is a warranty on the DAC.
4 ( 4 / 5 )
I've just received mine today and tested it in different computers, headphones and amplifiers with several channel-test files and definitively the output stereo channels are inverted. Right sounds left and vice-versa. Is this a defective unit? Hifimediy reply: This seems impossible, please check your cables, headphones and computer settings (try another computer). UPDATE: SALVADOR CONFIRMED THIS WAS A LINUX SETTING ISSUE.

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