HOQS Paraflex Type R 1x18

The Paraflex Type R Layout is another good example of an optimized enclosure which is easy to build and material conscious, with no removable panels  and a fairly simple construction.

Forgiving on drivers with that don't have the motor force of premium top shelf models similar to the Type O "within reason" helping to further reduce the overall cost of the system without compromising on low frequency extensions and output, maybe not as versatile as the Type O but an excellent alternative.