The series is "co", but the technology is Crown l. The electronic is substantially the same as the MA and MT sries that cost 40% more expensive. on the other hand, a CSL1400 MT1200 is more powerful than having the same number of transistors: they are ultimately MT or MA 1200 "dbrids", the CSL are therefore more fragile. Regrets: No XLR, and protections are innficaces if you connect the amp in 2ohm: feedback, I saw a beautiful bouquet of flame! This is good all the same bte, recommend, all fawn, when we take care of his stuff, there is no problem.