The Better Cables Blue Truth Balanced XLR Cable is our flagship balanced XLR Cable. Silky-smooth audio using our advanced TFE (Teflon) insulation. This audio cable is a dual conductor, twisted pair configuration. It features 99.999% pure silver coated conductors. Plus an equally pure silver coated shield will put you in sonic heaven. Balanced lines are the preferred method (for hum free) interconnecting of sound systems using a shielded twisted-pair. The principal behind balanced lines is that the signal is transmitted over one wire and received back on another wire. The shield does not carry any information, thus it is free to function as a true shield. This circuit's shining virtue is its great common-mode noise rejection ability. The concept here relies on induced noise showing up equally (or common) on each wire. It is mainly due to EMI (electromagnetic interference: passing through or near magnetic fields), RFI (radio frequency interference: strong broadcast signals), noisy ground references, or a combination of all three. Our Blue Truth XLR cables exhibit exactly equal impedance from each line relative to ground, guaranteeing equal noise susceptibility. Since the balanced input stage amplifies only the difference between the lines, it rejects everything else (noise) that is common to the lines.