Always years behind, or not active originally, but a great topic.
Lucky to buy (trade/scrounge) used original Raidho D2s back in 2016. They replaced Dyne Sapphires (3 way and much larger).
For a 2.5 way (150 and 3k) with two tiny 4.5" mid/woofers, and using the DSPeaker Anti-Mode 2.0 (for room/bass correction and to tame the Raidho's built in hump) they play nice and smoothly down to 30Hz in our 20 x 17 room, but they sure don't do rock concert loud (low 90s peaks tops, or popping!). Fabulous fast tight clean and rich sound with those blessed sealed ribbon tweeters.
Still I like having three SVS sealed subs passed low (35, 40, and 45 for now) and not easily audible with most music which I like.
But if I'm going to run three subs, they could very easily do more than they are, and consequently relieve the D2s of that really deep bass output. Plus that should also benefit the mid-range and yield a bit more dynamics (I know I shouldn't ask for more volume...but it's so nice).
The W4S integrated makes the D2s sing, but I have not been able to successfully split the pre-out line-level signal to subs and DSPeaker unit (which could easily high pass the D2s however blended best). It yields mono and I'm stuck. I need to think harder on this.
Great thread Erik, and gentlemanly conduct on your part at all times. I'd have groaned inside a few times... :-)