It's a usb audio interface use UAC1 way ， different from normally synchronous or asynchronous ，It‘s use synchronous mode and a big FIFO .
The UAC1 interface has two OSC （22.5792 and 24.576MHZ）for audio ，and a NDK 10MHZ OCXO for MCU work （STM32H7B0）.
There are RCA SPDIF output ，HDMI（I2S over HDMI）output , four SMA output DATA/LRCLK/BCK/MCLK .
Because of UAC1 mode，it only supports 44.1/48/88.2/96KHZ PCM，but much more better than many UAC2 machine ，I use it to listen apple music ，is very suitable.
The UAC1 interface has two OSC （22.5792 and 24.576MHZ）for audio ，and a NDK 10MHZ OCXO for MCU work （STM32H7B0）.
There are RCA SPDIF output ，HDMI（I2S over HDMI）output , four SMA output DATA/LRCLK/BCK/MCLK .
Because of UAC1 mode，it only supports 44.1/48/88.2/96KHZ PCM，but much more better than many UAC2 machine ，I use it to listen apple music ，is very suitable.
Hello good day, do you go by Million Audio aka "傳說中的藏精閣"on taobao? I recently purchased the UAC-1 from a reseller on Aliexpress and although it seems like a great product mine unfortunately shipped with no 4sma output only spidif and I2S. I have an RDAC-1 that you seem to have discontinued I was hoping to use the UAC-1 with it since it only takes 4sma in. Do you perhaps offer an I2S to 4sma cable? Thank you for your time!
Yes , UAC1 has no 4SMA now , you should use HDMI i2s only , I suggest you buy our 38Q2M DAC
Thanks I've had my eye on the 38Q2M Dac seems like an interesting device! Is there any way to send my RDAC-1 to you guys and have it retrofitted with a I2S input instead of 4sma?
Hello unfortunately the RDAC-1 I have only has their proprietary I2S connection (4sma) its basically 4 "sma" connectors with sepperate connectors for the Data, BCK, LRCK, & MCLK. At one point I was looking to get a custom cable made to use with an hdmi I2S output however Im not sure anyone knows how to make a cable for a device like this. There is hdmi to sma cables that are almost what im looking for but the dont have the + & - on the same male sma connectors and since these cables seem to be used only in special circumstances they are crazy expensive ($3,000 + USD). Shame I ordered during their faze out of the proprietary connector since I haven't been able to listen to it all, at least it wasnt crazy expensive though.
Oh well hopefully they work on a better R2R product at some point. Have a good one ✌
Oh well hopefully they work on a better R2R product at some point. Have a good one ✌
@MagV Thank you for your thoughtful reply. I have ordered the R2R dac from ali but order was (fortunately) cancelled since the dac is phased out. I didn't know there is only 4sma input. I don't recall ever seeing a photo of the rear. I thought I saw some DDCs with 4sma output but can't find any now. When I use google image, mostly only UAC1 comes up. I did get the UAC1 from an ali seller that has product photo with 4sma output. In fact, most sellers on ali still has the old product photos and description. But, the one I got didn't have 4sma either. Fortunately, I really like the UAC1 which led me to purchase other products from the same maker/manufacturer including the sabre dac and the si384 ddc with 10mhz clock. Right now, I really like the pairing of UAC1 with a 1543 dac I got on ali. That's why I wish Million has a it's version of r2r dac.