The HT-112 extension cabinet contains 1x12" custom designed Blackbird 50 speaker. It has been produced to the highest standards and using the finest materials. Every care has been taken to ensure it produces the best possible sounds. It really will last a lifetime! HT-112 Overview 12" Blackbird 50 watt speaker, custom designed by BlackstarDesigned for use with the HT-5 range HT-112 Speaker The HT-112 extension cabinet uses 12" Blackbird 50 Speakers