Jake7String

I have just bought a line 6 spider 4 150w combo amp about 2 months ago and saw on the back of amp it has a speaker port. am i able to get a cabinet and have this thing work like a full stack amp? if i can what cabinet should i get for it? and whats compatible for it? if not is someone able to explain what exactly those are there for? please and thank you. and i also apologize if this topic has already been discussed in the past.