The DBX 12 Series were designed to meet the needs of the most demanding sound reinforcement applications while offering the simplicity of straightforward controls. They will tame the wildest hits or subtlest nuances of any signal. The 1215 is a dual 15 band and the 1231 is a dual 31 band. Both feature 45mm faders, XLR, TRS and Terminal Strip I/O's as well as a chassis/signal ground lift. Internal Power Supplies and 2 second power-up delay are just some of the visionary design elements that keep DBX as the last word in affordable, high quality EQs.