I have a Mackie studio mixer that drives a 20m installation balanced line to drive a domestic amplifier with standard line inputs (600mv 50k). What method could be suggested to unbalance the cable to drive the amplifier. Active / Passive ?? I've been looking at 2x Palmer Pmt 11 transformer, perhaps others have other experience. The connection is basically wired, so any connectors are possible, although I would prefer cable in / out and the minimum amount of dials, switches as possible. FYI This line drives are pair of mid field / far field monitors, via a ROTEL RA-06.