Just looked up your speakers, some nice design principles :) In fact the very same I intend to employ on my next DIY speaker build :eyebrows:
4 way = less intermodulation distortion & rubber mounting of the upper bass/mid, mid, treble enclosure :)
Obviously I wasn't going mad looking up what I was doing a few weeks back on ebay. At the time I was wondering if it'd be worth the hassle, looks like I'll be buying some small engine mountings :rfl: