Our HST-18 mkII is a dedicated Home Theater weapon of mass jubilation. Playing extremely deep and loud with the atypical ability to sound exceptionally good all in a very small enclosure is what the HST18 mkII is all about. The HST-18 mkII uses the same motor found on our HS-24 mkII utilizing a four layer bi-filar aluminum voice coil and a large ferrite motor with two shorting rings with an additional item to eliminate eddy currents that lower, and linearize, inductance for improved transient response for “faster” bass feel. With 38 mm Xmax and over 4″ of peak cone travel the HST-18 mkII is capable of delivering more bass than you need. The HST-18 mkII can be used in sealed or ported enclosure alignments.