Here's a really, really cool mod I did to my two Atomic 112-50s. After switching my stock speakers with both an Eminence Red Fang and Wizard, I then had a speaker jack installed between the internal speaker cut switch, and the speaker.
What that means is that by having the internal speaker cut set to "off," I can now use the cabinet as a passive cabinet with other amps!! DOUBLE DUTY!
If you do this mod, make "sure" to set the cut switch to "off" any time you use this as a passive cabinet... If you don't, you will get power "backwash" going back into he Atomic's transformer. Not a good thing:)
Super easy mod, and makes the Atomic even more versatile.