So I finally got my closed Sine in and have had a chance to A/B them. The lower impedance of the DX help with overall loudness. I find myself having to turn up the volume more on the Closed to match levels to the DX. DX has a slightly wider, more natural sounding soundstage vs. Closed. With the Cipher Cable, DX sound improves with better dynamics and separation, but this cable was designed to be optimized with the Closed. Cipher sounds more natural with the Closed. With the DX, there was a odd "hollow" or maybe veiled sound with vocals I noticed. Hope this helps those considering DX + Cipher.