Arts and Entertainment How long is a large sub? How long is a large sub? Small subs run 4 inches long, mediums are 8 inches and larges are 12 inches.16 Aug 2020 Related Posts:Sub-Zero's real name is not known, but what is it?There is a guide to standard sofa sizes and dimensions.Can an 8-gauge wire handle a 1,000 watt amplifier?What is gifting subs on Twitch?