After auditioning this speaker (5-1/4 woofer, 1" tweeter) for one week for late night listening purposes in my system (TV/Music), I returned them. It is surprisingly well made and solid for $50, and it is acoustic suspension design.

What stired toward this speaker was its higher frequency response. Its Treble sounded much better than other KLH offerings, and any other speaker in the Bestbuy that I auditioned that were under $100. The midrange sounded OK, but it had kind of boomy sound to it that masked detail in the midrange region.

I believe that is a common problem with most [low priced] bookshelf speakers. With only one woofer speaker to take care of midrange and/or midbass, the manufactures try to kill two birds with one stone by forcing woofers to do double duty producing midrange and bass notes, resulting in muddy sound.