Hi! I am interested in buying the Eris E4.5 but as I was doing my window shopping, I noticed that some pictures of the back of the speakers from some sellers had an Acoustic Space switch as well as a Low Cut switch while other seller's pics don't. I've been asking around the internet if perhaps there are 2 models of the Eris E4.5, but I can't seem to find an answer. Could you help me out so I could decide? Thanks!