Sealed Loudspeakers?

Audio Note AN/K.

ESP speakers are sealed box designs and wonderful speakers

its easier to find used fullrange acoustic suspension models, but there are still some out there. some to consider which are currently in production are shahinian, duntech and fj......older models such as hales, ar, and dunlavy are out there. its pretty hard to go wrong with these brands. the comeback of allson acoustics was shortlived, and they are hard to find. good luck...they are worth seeking out.

NSM and Role Audio speakers are generally sealed.

You are definitely on the "right path" imo. Magico Mini should be on top of your list. In fact, all Magico speakers are sealed designs. Once you hear properly executed acoustic suspension designs, there's no going back to the ported ones.

(disclaimer: i own and love my magico mini)