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Well, they are both DACS so I don't think you'll be doing much opamp rolling.
Meanwhile Gustard is presenting new model Gustard A20H, fully balanced with double AK4497 chips, discrete amplifier and so on.
All inputs support DSD:
IIS supports DSD64、DSD128、DSD256、DSD512
SPDIF、Optical、AES/EBU supports DSD64 （DOP);
USB supports DSD64、DSD128、DSD256;
Here is few pictures of upcoming release:
Nice!!! A cool piece of gear for me to try out this winter!
After my posting i have found that head-fi already has dedicated thread, so check it out:
When I connect my X-12 to my computer (running windows 10) via the USB, the computer does not recognize the DAC. Do I need to download additional drivers?
If so, where do I go for the download/
You need to download windows XMOS USB 2 drivers
Apparently Windows 10 anniversary now has built in USB 2.0 support but I have not tried this
This is the Tabao Gustard site - Chinese
The Windows 10 driver (v3.20) can be download from here
Once loaded click on the download icon on the top row (slightly right off centre)
Then click the left hand button in the pop up for acceptance
Gustard X12: can you connect both RCA and balanced outs, and then toggle between them with an output switch? Can X20 do this?
The X20 and X12 output to both RCA and XLR simultaneously. In order to switch the outputs I suggest you invest in a small preamp.
For example see https://www.aliexpress.com/store/product/Finished-Mini-Fully-Balanced-Passive-Preamp-HiFi-Pre-Amplifier-XLR-RCA-Volume-Controller-With-toggle-switch/1499523_32749234407.html
What is the output impedance of the x20 balanced and unbalanced outputs?
I want to drive my power amps directly
I think more important thing is the maximum input voltage if your power amp.
The input impedance of amp is quite high so that output impedance us not a problem.
I am not an electrical engineer but after reading this
It seems that matching an amp to a preamp is important. I did discover that the output impedance of the x20 is 100 ohms.
The matching impedance is for very high frequency signal that the wave length is comparable to the size of electronics.
The audio is very long wave length so that it is irrelevant to the matching.
There is some myth on this world.
The input impedance of the amplifier more than several kilo ohms, which is far higher than that of the output impedance.
Only concerns might be that the higher swing of the preamp will clamp the signal, and the the sound will be muddy.
In general, the matching might be something not for the impedance but something other like harmonic sensitivities / transmission / as regarding the power amp as seen as filter.
X20 has volume control and will be matched well to your amp.
Anyone have compared x9 and x12 ?
The x9 price is very attracrive... And i fear the sabre to be a little bright ...
Any advice to choose between them ?
Anyone got a Gustard X9 they were looking to sell? I have feedback here on Head-Fi and am in the US.