Absolutely! Our Block Series and Mach 3 amps have two speaker outputs so you can build your own modular system. 

Plug one into the "bottom" speaker jack and one into the top. 

Note: On guitar heads, the "4 Ohm" Jack has a special contact that increases the amplifier's output. This allows you to get additional headroom. So when plugging in a single 8 ohm cab plug into the bottom jack. ONLY plug the second cab into the top jack unless you have a single 4 ohm cab, then plug it into the top.