Sorry men but I connected my Little Dot Mk2 amplifier to HeadPhone RCA unbalanced output because I already use the line-out RCA with 2 active speakers. Is it correct or is better to use RCA splitter over Line-Out RCA unbalanced of my topping? But also with this setup the headphone listening it's gorgeous .... it sounds fantastic with my Beyer770 @ 80 OHM
marcom22I'm not sure if this is what you're saying, but it seems like you're using the RCA out of the DX7s to your Little Dot MK2, and then putting the RCA out of the Little Dot MK2 on your active speakers.
I don't see a problem with this, only that your active speakers are getting the colored sound from your Little Dot as a tube preamp. That is a personal choice of whether you want the tube sound going to your speakers or if you want uncolored sound you could potentially split the RCA signal to your speakers and the Little Dot.
marcom22It'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.