I plan on building a few cubo 18s . I dont have any 18s laying around except a few drivers from a set of Behringer VP1800S. Will that work at all? What drivers would you recomend?
I Can only tell you of my first hand experience with the Cubo 18,
I've built a pair (still have another pair to build) of Cubo-18-570 Extended (If you do a search for Cubo18-570 you should find the thread I started on speakerplans.com)
I Loaded mine with the Eighteen Sound 18NLW9400, A very capable driver.
I use it exclusively for live music and it's a very impressive little Box.
My Version's dimensions are 620h x 650d x 570w so About 230 Liters. I narrowed the cab's original design width from 620mm to 570mm for ease of transport,
I had built prototype cabs out of mdf of the full sized orginal plans and compared it to the narrower 570mm wide version i built.
Measurements showed the 570mm wide cab lost about 2Hz in extension, So IMO not enough to warrant going with it wider and transport unfriendly original design.
I've been using them for about the past year now and I'm still impressed every time I fire them up.