I have the 840c in a fairly 'bright' system, using PSAudio integrated and Magnepans. The balanced on the 840 DOES help low end definition. And I went 'cheapo' on my 1st set of Balanced cables.....a quick trip down to Guitar Center for some Mogami studio / instrument cables.
As is usual, the RCA shipped with the CA is near-worthless.
As is usual, the RCA shipped with the CA is near-worthless.