It's not optimal, as you want the steady higher voltage output from the rear going to the Little Dot. Otherwise, you are using quite a bit of gain on the Little Dot, which can add to noise/distortion/clipping. Obviously, you have to make more of a choice now that you have two devices you want to connect. If your speakers have XLR input, this could work as the DX7s outputs to both the XLR and RCA at the same time. This decision is up to you, I suppose if you really like how it sounds now and don't notice much difference when using the RCA out to your Little Dot, you can if you like.