yoorider wrote:In my research,
1. AES/EBU needs 2~7 voltage level & 110 Ohm
2. SPDIF needs 0.5 voltage level & 75 Ohm
yoorider wrote: 3. RCA needs 1~2 voltage level & 75 Ohm
There is no RCA-digital interfacee.
The SPDIF Coax plug is an RCA connector, 0.5 V, 75 Ohm.
yoorider wrote:There is no "SPDIF to AEB/EBU cable". It needs a digital converter like Hosa ODL-312 because there are the differences above described. But, "RCA to AEB/EBU" cable is there. So, I am confused about that.
Is there no possibility of signal loss? Can I think that AES/EBU accepted limits are generous?
(I had thought that signal loss occurs some noise then affects the sound quality before your reply.)
I’d like to clear up some misconceptions about SPDIF-Coax to AES-XLR interconnect.
First, I suggest not to make too much out of it.
SPDIF-Coax to AES-XLR practically works quite well most of the time, because the real world AES receiver chips are typically more sensitive than the figures you picked out of the net.
The impedance mismatch works in your hands too, because the higher 110 Ohm AES load does not drop the voltage as much as the 75 Ohm SPDIF receiver would, you get 0.7 V instead of 0.5 V at the AES receiver.
The usual way to deal with it: plug it in and try if it works, most of the times this is all you have to do.
If it doesn’t, it probably will work with the adapter mentioned.
Your main concern was signal quality.
Most quality issues with AES and SPDIF are very clearly audible with normal music, as signal dropouts.
Now, if you want to make sure there is no signal loss, set your player to the highest sample rate you intend to use.
Be aware that 192 kHz is the upper limit the AES/SPDIF interface can deal with.
HINT: for high sample rates use cables as short as possible.
Then, from any source like a sine wave generator app (preferred), download, YouTube, play a very high frequency sine wave, between 17 and 20 kHz (in the range that is inaudible to you).
Be sure to use a natively generated signal, not a resampled one.
Important, do NEVER dial up high volume, check with music at moderate level before playing the sine, or you might fry your tweeters.
Now listen for some time.
If there is something wrong like dropped samples, glitches will occur that sound like the click when the sine wave starts and stops.
If you don’t hear clicks everything is OK.
Tone Generator / Sinewave Generator Apps, e.g.:
https://www.artalabs.hr/
https://www.roomeqwizard.com/
https://www.dr-jordan-design.de/signalgen.htm
https://apps.microsoft.com/store/detail … &gl=DE
https://appfurpc.com.de/app/768229610/a … sgenerator