Here is another installment in my continuing series of listening impressions using a Chord DAVE/SRC-DX combination with Taiko's new USB drivers for the SRC-DX. When Emile had finished installing the drivers on my Extreme, he sent an email:
"Pretty sure it should be USB4 with roon set to 32-bits, but feel free to try others, USB3 with roon at 24 bits, or USB2 with Roon to 32-bits, or USB1 with roon to 24 or 32!"
Since these were all-new drivers as applied to the SRC-DX, Emile is encouraging experimentation. Among the users of the same gear that I've been in touch with, it seems that there is a consensus that Taiko's USB4 profile sounds best and that this driver sounds better than the old ComTrue driver in the SRC-DX. I know of at least one person, however, who still prefers the ComTrue driver in their system.
I had heard that the USB4 driver produced a distinctly different sound if Roon is set to 24 bits max rather than the 32 that Emile is suggesting in the above quote. So I experimented going back and forth between 24 and 32 bits this morning in Roon. Since I wasn't switching to a different USB profile, I could go back and forth fairly quickly by just changing the Roon setting.
When I switched to 24 bits, what jumped out at first was a change in perspective. To my ears, this is a more forward, up front sound, almost like the microphone placement was a little closer. It sounds a little more raw and there is a sense of heightened detail, but the longer I listened, the more I believed that there really was no increase in detail, just a change in perspective. Perhaps more importantly, the longer I listened to tunes I was familiar with, the more I felt challenged by this 24 bit setting -- challenged in terms of what I thought the music should sound like. To my ears, there seemed to be something "off" in every tune and that interfered with my musical engagement.
By comparison, the 32 bit setting provides a more distant perspective, but maybe counterintuitively, I experienced greater engagement. I heard greater layering front to back and I heard a more beautiful, smoother, and seemingly more natural tone. Overall, I preferred this presentation, which was gentler and more inviting, and gave a greater sense of wholeness and cohesiveness to the music.
I should mention that all of the tunes I listened to were PGGB'd at 24 bits. It is confusing to me why a 32 bit setting on Roon would sound better when all the files were 24 bit and when the SRC-DX can only send a 24 bit signal to the DAC pursuant to the S/PDIF protocol. But I heard what I heard and it seems Emile may be suggesting that the 32 bit setting is more technically correct for this USB4 driver.
Of course there are three other USB drivers and so I did some additional listening. Per Emile's suggestion above, I listened to USB3 at 24 bits and I liked it better than USB4 at 24 bits. Essentially, I heard the same sort of sound from USB3 at 24 bits that I heard at 32 bits (and which I covered a few days ago in a separate post): a forward, bold sound that some might find exciting but I found a little too in my face. By comparison, USB4 at 32 bits was more relaxed and refined and allowed me to follow complex music more easily.
I also listened to USB1 and USB2 but by this time I was getting tired. I had listened to both a few days before at 32 bits and they didn't sound bad to my ears but also did not engage me the way USB4 at 32 bits does. But I've given options 1 and 2 pretty short shrift, so don't take that as gospel.
As always, I am very interested in what others are hearing and I'm sure Emile & Co. would like to hear as well.