For anyone looking, this was recently released so there are no reviews on it anywhere. Also, since there are very few WiSA compatible devices I doubt we will see reviews before the end of this drop.
Just looking at it's dimensions, the 6.5" sub-woofer could be accounting for a lot of the lower frequencies of the bookshelf speakers since they are pretty small. Unless they pull some kind of Micca RB-42 like miracle. I would guess a crossover of 120Hz or more. Also being a 6.5" slim subwoofer, it won't be able to extend that low or with enough power for a large room. If it extends down to 40Hz I'd be surprised.
I personally think a Sonos system would be a lot more capable for both sound and functionality if you can get the speakers for pretty cheap (Beam, 2x One SL, Subwoofer). That is considering you want the small form factor and convenience of wireless. If you don't care about wires, there are a ton of options at this price point.