For both drivers (if they are really used) there are reviews in the
German magazine 'Hobby-Hifi'. Because of copyright I can not post the complete reviews here, but hope that a HD diagram is okay and no one complains.
Especially the 3.5-inch midrange (which looks an awful lot to me like the $30
ND91)
The small Dayton chassis is really not bad. The decay is good and the FR on axis is balanced.
Unfortunately, the chassis has no optimizations that reduce voice coil inductance (shorting rings, Cu pole cap,...). Therefore, the harmonic distortions are okay, but not very good.
For a high-priced speaker, there are definitely better drivers.
I think Tang Band has a couple small subwoofers that look like this too and are a little more premium.
https://www.parts-express.com/Tang-Band-W5-1138SM-5-1-4-Neodymium-Subwoofer-264-831
The Tang Band's W5-1138SMF chassis makes a very ambivalent impression. The subwoofer shows a balanced FR and good decay.
However, since this is a low budget chassis, no optimizations were made to control the voice coil inductance.
(Since the FR of the chassis drops from 100Hz due to the heavy moving mass, the 80dB average sound pressure stated in the measurement should be viewed critically. It could be that the sound pressure in the low bass was higher - perhaps 85dB)
The harmonic distortions, on the other hand, are really bad. Even if we assume that the sound pressure in the low bass was slightly higher than indicated in the diagram, over 10% HD5 at 50Hz is unacceptable.
Such a driver belongs in a cheap soundbar, but not in a $10k speaker.