JBL MTC-CBT-70T Bolt-On Transformer Module - BlackThe MTC CBT 70T is a bolt on transformer module to adapt CBT 70J 1 and CBT 70JE 1 (and CBT 70J 1 JE 1 arrays) for use on distributed loudspeaker lines. It allows long cable runs and multiple speakers to be driven from a single distributed system amplifier channel. Transformer taps include 120W, 60W, and 30W for 70V and 100V distributed lines, plus 15W for 70V only. Features: Adapts the CBT 70J 1 (and 70JE 1) for Use on Distributed Speaker Lines 120W,