I just finished building a pair of Doug S. double balanced ICs using Connex/DH-Labs BL-Ag solid silver bulk cable, and compared that to a single run of the same cable. It's not a fair comparison, as I also replaced standard Neutrik connectors with premium Bocchino XLRs with solderless terminations. After a few hours break-in the improvement is spectacular-- detailed, smooth on top, organic mids and LF, and a deep wide soundstage. The application is a 2M balanced run between an Esoteric K-01X and an Atmasphere MP-1 preamp. I'll be curious for Ralph's findings as well.