@akg_ca I’m not familiar with that particular sub, but I would trust anything ATC makes. I pair my 30.1s with a JLAudio e110 10" sealed sub (receives signal from a very fine electronic crossover), and it’s perfect.
@dpac996, I had a modest but amazing sounding pair of ATCs here on the desktop for several years, the SCM12 Pros (passive 2-way). The tweeter is exceptional, just as everyone says, and the 6" mid-woofer is pretty amazing, too.
I ended up "trading up" to two pairs of sealed 2-ways that are larger, borderline too large for my desktop (vintage KEF 103.2s & Harbeth 30.1s), both of which have a 8" woofer. As I suspected, the bigger woofer moves more air and gut-punches me better than the ATC could. But really, that’s more a testament to my bass/mid-bass addiction than anything else.
True, the Harbeth isn’t as good in the bass/mid-bass as it is in the midrange on up (where it is world class). No problem, though. I’m about due to swap out the 30.1s for the KEFs, which are far more dynamic in the lower register but still sound great on top. What can I say? Life is good....