I am using an asymmetrical crossover with the 7” driver. The tweeter is second order and the driver is third order to help minimize cone break-up.
Bass response at normal listening level appears to be crisp and precise down to the 40hz range. It is impressive for a relatively small speaker.
What is is definitely lacking compared to the very best monitors is the massive soundstage and ultra-detailed imaging that you get from my Blackthorns, The Kaiser Chiaras, Raidho’s, etc... They all sound much bigger than they are.
I have not tried these drivers in a more rigid cabinet (I.e., Carbon Fiber) so I am unsure if I am simply experiencing a limitation in terms of the drivers or that the drivers are limited by being in a less than perfect cabinet. Bamboo has proven better than MDF in my testing but not at the same level as Fiberglass and a big step down from Carbon Fiber but other than aluminum and a few other materials, what isn’t.
the Seas Magnesium drivers are great and what is unique is how much bass they deliver compared to other drivers at the same size. Best in the world for off the shelf? If bass is your motivator, almost certain they are. Either these or the Graphene’s.
If balanced sound (bass vs detail and soundstage) is your concern, Eton’s Arcosia is probably the best driver in the world off the shelf. Massive soundstage with imaging that is off the charts.
For just detail (who cares about bass) Acutons might be the best. These might be the perfect midrange in a three way way speaker.
Regarding tweeters, the Seas Excel is very nice. The high mass makes it a good fit for these less rigid (non-composite) cabinets. In a wood/plywood/MDF cabinet it is superb. Not sure it would do much better in a more rigid cabinet.
The Seas drivers are about as good as you can get for inexpensive (MDF, plywood, solid wood) cabinet materials.