Which heads work with the 12CB, 12HD, and 15?

These three cabs work with our Block Series heads (Tone Block 202, OverDrive 202, and 101 Reverb) as well as the Mach 3 head. One thing to note about mounting: only the Block Series heads fit in the slot on the back of the cabinet. If you're pairing one of these cabs with a Mach 3 head, the head will need to sit on top rather than dock in back.