Hey Guys.
I run 2 x 8341As on iron stands (hanging mount) with one 7360A in a 25m2 room (roughly square-shaped; ceiling 2,75m high) with no treatment and low-to-medium clutter, no rugs. Before adding the sub I had some serious standing wave issues on a very narrow range of low frequencies but the sub fixed them as I expected. GLM works miracles although current iteration (4.1.2) has a small hiccup where it doesn't load the calibrated preset into the sub at startup (fine with monitors) and you have to click the preset button in the app to "nudge" it. Proud to say I brought the bug to Genelec's attention and they are now in the process of fixing it with a new firmware/GLM update! Fantastic support all-round I must say.
And the one sub is enough, trust me. Those things are fabulously powerful and work absolute wonders with the unparalleled GLM calibration -- which IMO is a must already for the 8341As alone, and unquestionably when the sub is involved.
Anyways, my two cents. I feed the Genelec gear from an RME ADI-2 FS and this set up will stay with me until something breaks. I can't imagine any piece of boutique hardware beating the sheer science of it all (also helps I'm an unsentimental clarity and 1:1 reproduction freak lol).
Happy to answer any questions.
Also my first post on ASR
Peace.