JBL CBT-70JE-1 Extension For CBT J-1 Speaker (Black)The black CBT 70JE 1 Extension for CBT 70J 1 Speaker by JBL Professional is purposely designed for use with the CBT 70J 1, in a tough berglass reinforced ABS enclosure. The speaker contains four low frequency drivers and a crossover network. The 500 W power handling and high sensitivity delivers powerful low frequency output. When connected to a CBT 70J 1 speaker, the CBT 70JE 1 Extension provides extended bass response, extended pattern control, and