JSTAATS14

Okay, can I use 2 l2t's linked together and only use one side panel mixer but still have the sound that's going through the one mixer being used played out of both speakers!? Reason I ask this question is because sometimes I play shows by myself and sometimes I have some one join me on guitar and backup vocals.. so I was wanting that option of having basically 4 channels, someone please answer to where I can fully understand! I would greatly appreciate it!

I'm an acoustic artist looking to buy a new sound system for live shows, I'm used to have 2 pa speakers behind me spread apart so there's no feedback and I can still hear myself, I was wondering if I can use the l2t with the on board mixer to the left of me and use a l2m to the right of me, that way I can hear myself in both ears