Not sure about the balanced difference but there are vast differences between models. I thought that Rosemary and Narcissus were just higher ohm versions of the SL. Nope they are different. Rosemary is a lot more warm sounding (bass emphasis) than the SL. From what I read of Narcissus, it's way different also. I've got SL 1.0 (and 1.0+) and Rosemary and looking forward to Narcissus in the next month or so. May even buy those first batch FAAEAL's .Great brand.