tube loaded diamond tweeter all models.
Solid milled decoupled aluminum turbine head on 800,802, 803 D3's
Decoupled Continum mid range driver: Matrix cabinet construction for bass speakers: Aerofoil designed bass design with a woven fabric proprietary material:
804 do not have the turbine head and the 805 have single continuum driver.
700 series trickle down from 800's: 702 & 705 Have the solid milled aluminum tweeter tube. 702,703, 704 Floor standers have the decoupled continum midrange but no turbine head models & they use aerofoil designed bass drivers but cheaper material than what is used in the 800 series & no matrix construction: The 700 series tweeter is a decoupled design with an aluminum tweeter that is treated with fine layer of carbon: hence: the carbon tweeter to extend the breakup frequency & to smooth out the performance over the standard aluminum tweeter.
The 600 series shares the continuum driver material & the B&W design team so there is continuity to the house sound when you travel up the line. It uses a decoupled aluminum tweeter minus the carbon tweeter & traditional bass drivers: The 700 series has a more solid cabinet construction & higher end furniture grade finishes with superior magnets in the drivers.
Hope this helps; I have been selling B&W for 10 years & have attended a number of their training events over the years.