In the mid-1970s WEM produced the Band 2×12 columns and the Band System columns which were the same as the 2×12 columns but with the addition of an HF horn. The Band and Band System columns were an upgrade from the Club and Club System columns in that they had drivers, usually Celestions, with a higher wattage rating and so a pair of Band columns could handle amps up to 100 watts.
I acquired this pair of Band System cabs in January 2017 and, as you can see, each cab contains a pair of Celestion G12, 30 watt drivers plus a Celestion T1360 horn.