Just for interest, I've started on Sub #3 - another Sonottube, but smaller (taller though) than my first one. This will be powered by the Hypex HS200 panel running a Shiva III 12" sub and will look a lot like the SVS sub

. Photos to follow, but trying to locate a decent 4" port at the moment (alread found nice 15" grill for the sonotube (16") and have black carper and paint
As such I will be selling either of my old ones to fnd this one soon