I too have the Sigma 2 without the upgrade, and before I got my Cal Delta, used it with a Teac CD player. The improvement was dramatic.
Miami_a1a: what digital cable do you use ? I use a Cardas Lightning, and sometimes wish I had something a bit mellower.
Miami_a1a: what digital cable do you use ? I use a Cardas Lightning, and sometimes wish I had something a bit mellower.