Hi Cubo ,
thanks for the reply as always...I missed it for a bit , I usually get a notification on my email but I may have missed that as well :-/
In the meantime I move forward with the project and I did as you them mentioned in your reply. I'm half way through the building on one MKH230....funny part is that you realized the size of these boxes once you start building them, which is why I really like all the cubos design, compact and strong.
I ended up using a 18mm plywood even if it's a single driver design, I think I could have gone with the 15mm and have a lighter box but when I redesigned it to cut the pieces on a CNC the 3 mm change was messing a bit with angles and mitred cut so instead of recalcualting everything I went the easier route and kept it 18mm...
now I have another point to consider, Have anyone used sound dampening material on the inner walls of this speaker ? I did used it on Cubo Kick 12" and I think it helped the overall sound I was wondering if I should do the same before I complete it....
if so, should the dampening material be applied on the inner walls around the driver and also in front of it ? Trying to avoid to put it in areas where it will be visible from the outside for cosmetic reasons.
Attached a quick sketch about where I'm thinking to apply it shown as red rectangles