What is a “dub plate” special and why did they exist ?

A  The police would arrest dancers that disobey the dictators orders and send them to a special cell with a hot floor to prevent dancing – a “dub plate”

B  It is a song commissioned and recorded for a specific Soundsystem. There arose a great deal of competition between Soundsystems and with American records becoming more and more difficult to find, owners hoped to record hit records that could only be heard at their own parties.

C  It is the large piece of metal that they put on the back of a speaker. It would vibrate and make the bass sound louder.

D  To draw people to their Soundsystems, owners would pair with food trucks and many became known for there “dub plate specials” as much as the music.