Thanks all for the information.
I received my Harmony DAC earlier today about noon time. The order was placed two days ago. The shipping is fast.
Setting up of the DAC is straight-forward.
Out of the box with the Harmony DAC replacing my Eversolo Z8 in RS130-RSA720-DAC connection, the sound is already much better in detail presentation. Treble-wise, the improvement isn’t much but noticeable. The amount of bass is similar but carrying more gravity and weight.
Singer voices, both male and female, are warmer and sweeter than the Z8. Sound stages and music separation are more defined, too.
Regarding I2S, unlike the suggestion from StandardModel provided above, it is the A MODE (not B MODE) on the RS130 is compatible with the Harmony DAC, where the default LAiV mode, as well Mode 1, 4 and 5 can be used without any problem.
Not sure if the changes from B MODE to A MODE in my case is due to different firmware version or not.
Sadly, in my system, I found the sound from the I2S setup isn’t as good as the USB connection which is more open and relax in my system. I am not sure whether it is the 8K HDMI cable or the RSA720 USB Hub or something else. Will test out more later.
Anyway, above is my first impression of the Harmony DAC right out from the box in cold condition. Improvements from the DAC, frankly speaking, are not day and night but can still be heard clearly. I believe it will get better after running for some hours.
What about the “long-awaited” RD160 ? I don’t know. It’s currently removed from my awaited equipment list.