So how do they sound?
This question needs to be answered again when the new coax arrives, and will of course evolve throughout development. But I can at least comment on the low end, which is deep and tight. You'd be forgiven for craning your neck and looking for the sub when listening to how this is currently tuned.
After a few days of experimentation, the midbass is also relatively punchy and full, and I aim for this to improve further with the new 8" coax, that will be crossed over relatively low in order to contribute in the lower midrange as well (and also drive the cardioid effect as low as possible). Overall it sounds really good at moderate levels, and when you turn it up it's fair to assume that it would get people dancing at a party in a relatively large space.
The mids and highs are very similar sounding to both the SBS.1 and the Manta, not surprisingly since the driver is the same. So that will be interesting to revisit with the new driver. Open and transparent while not being fatiguing, and with a soundstage that is large and wide across genres, another very pleasing feature found on both siblings, but the Manta especially.
Overall very promising so far!