Passive radiator box

[Mojsoski]

Hi there,
I bought a nice mid-woofers that have manufacture provided box volume and tube measurements. I would like to try to build my boxes with passive radiators instead a tube. My only question is should I keep the same internal volume when use those passive radiators?

 

[Lojzek]

You can keep them the same or not, just as with reflex loaded ones. Simulators will help you further understand possible issues regarding PR's. I use excel spreadsheet "Woofer box and circuit designer".