The newer version of foam has been improved compared with to the previous one. The foam sits tight around the bass pipe to prevent audible resonance at lower frequencies. The V-shape sits on top of the other parts and provides a “chamber” for the drivers.
Ok, now I feel totally stupid. I mount them wrongly because the picture wash cut at the top and I believed it was top of the speakers. I’m good to open them again.
That mount make sense.
Apologies to Geoff.