Check this out: Just plug you 001's monitor outs into a power amp, then plug the amp into one of these. Then hook-up up to 4 sets of speakers that can be used individually or in any combination. They also have a 3 speaker pair model.
You won't be able to use the Radioshack unit with the powered speakers. I suggest this instead: Don't be scared by the pic showing 3 inputs and 1 output, it can be reversed (for your use you'll want 1 input and 3 outputs-and actually just use 2 of them).
Check this out: Just plug you 001's monitor outs into a power amp, then plug the amp into one of these. Then hook-up up to 4 sets of speakers that can be used individually or in any combination. They also have a 3 speaker pair model.
I would whole-heartedly recommend this: I've been using it w/ my Mbox and it works like a charm. It will even let you level match the outputs of Spkr A and Spkr B so you can A/B without changes in level! Right now I just use mine as a simple level control for the Mbox's outputs. There is a handy-dandy cue section too.
Why not just use another set of outputs on the 001? You can send all your tracks to 2 outputs simultaneously by holding down OPTION+CONTROL (mac) or WINDOWS+ALT (win) when selecting an additional ouput on a track to apply that to all tracks. Then create another master fader for that output. To A/B I use the ALT/OPTION+click on a fader (to make it jump to '0'), then move that fader down and do the same on the other fader to make it jump to zero , bringing it down when I want to switch back to the other.