So, I have now tried placing the tuning discs on the speaker cables at the amp end or at the speaker end.
Ted suggested placing these at the speaker end. I initially felt they sounded better at the amp end.
Today, I again placed them at the speaker end, and I think Ted is right they do sound more 3 dimensional in that direction with a more stable center image.
At the amp end they sounded more diffused perhaps that is why they seemed to have more air.
I still have the discs on the interconnects at the source end.
ozzy