If money is no object, one of the finest OB's out there is the Songer Audio. It sets a standard I haven't quite heard in any OB speakers. And the build quality is second to none. Get ready to write a serious check, though. https://songeraudio.com/
Open baffle speakers
Open baffle speakers design is the simplest , to get bass response similar to other design , like ported, the baffle size must be huge to avoid low frequency degradations . Tipical size the baffle width 10-20" got weak bass performance. I am wondering how open baffle speakers design became so popular ?