Image of a Dual 12 Cabinet from 1974-75 Bell's Catalogue
THE DUAL 12 CABINET:
2 heavy-duty 12" speakers, 7.1/2 ohms. Recommended for the ER30 amp head (and
probably ER15). Size: 23" x 34" x 12"
THE SUPER DUAL 12 CABINET:
Two heavy-duty high-efficiency 12" speakers. Recommended for the ER40 amp head.