Hi did you put 3 on the pre and the CD as per the instructions? They are to be placed a certain way with the dots facing a certain way. My guess is you didn't do that, and then you can get it on the left or the right.
Put 3 on pre, 3 on CD, 1 each on the pedestal behind the panel as per their directions, you can then add 1 on each of the binding posts of the speaker and the amp - at least that's what I am going to be doing since that's what I demoed. Not to mention the block of 3 that you get next to your speaker.
That day the Lampizator dealer was visiting me, and just putting that block of 3 next to each speaker made him ealize how big a difference it was.
http://www.shunmook.com/userinfo/Shun Mook Application of the Mpingo Disc.pdf