Sealed Loudspeakers?

You buy the New NSR Sonic Research with their patented
APL lens which is a sealed system that refocuses the soundwave for incredible tight Bass that is at least in the mid to low 20hz region cleanly for a speaker under $5k to do that and sound so cohesive on top is a breakthrough IMHO and many others at the shows including reviewers agreed.

Esp speakers are some of the best sounding speakers. The smaller models were some of the best at the RMAF.
As Glide3 said, they are sealed.

The entire range from Manger employs sealed enclosures.

the NSR Sonic Research D-3 was the best by far in any sealed enclosure I have ever heard,for a loudspeaker under 4ft tall to play cleanly below the range of any insrument which is a grand piano I believe around 27hz that is saying a lot, Hyperior,von SCH vr4mk2 are muddy in compare, with the patented APL system and this speaker is 93db efficient and disappears in the room.
On the east cost you can get a listen at http://hifidelityaudio.com I have mine on order this is the best loudspeaker I have ever heard in the $5k range
and I have heard a lot.