For a moment I forgot where I am - of course they all sound the same! ...
![facepalm :facepalm: :facepalm:](https://www.audiosciencereview.com/forum/data/attachments/13/13811-b8bf2b7034744e246c9fb291e2f7f816.jpg)
But yeah, apart from the preamp thing, a remote, the dual chip design, a very different PSU setup, the bluetooth and balanced output options (I could well do without) ... wait...
Actually, the SU-1 is a terrible deal these days.
I got the Smsl C100 for 100€ shipped, and still wished the Topping E30 II and Topping E30 II Lite had sounded a little more mellow/forgiving on my system, after comparing those units.
Topping just gets the UI done far better.
But the SU-1, I can't imagine why anyone would buy that thing, it's not cheap enough to chose it over say a Topping E30 II Lite.