^^^ Jay, with the Jade 7 towers, the Aperiodic design is really well engineered. You can feel the foam at the bottom, but it is non-removable. There are some small slots in the base of the speaker as well. However, for the C2 center, there are two conventional ports in the back with the two "removable" foam plugs. These are the type of plugs that are included with some speakers from other manufacturers where you can run them either in sealed or ported mode. You are correct, since the C2 is designed with the Aperiodic loading, they should have not designed it with the removable port plugs.