Eldartford, when you have twice the signal, you can run the device with half the gain. That lowers the noise floor considerably. As for the ICs themselves, it's not so much that they resist noise pick-up any better than a SE IC. It's just that the noise in one signal conductor is 180 deg. out of phase with the noise in the other signal conductor, so it self cancels.
Pmotz, the McCormack DNA 500 has fully balanced circuit topology from input to output. Specs are on their website:
http://www.mccormackaudio.com/
Pmotz, the McCormack DNA 500 has fully balanced circuit topology from input to output. Specs are on their website:
http://www.mccormackaudio.com/