Creative 70EM896106000 Owners Manual - Page 115
Useful Information, Cables - balanced or unbalanced?, Balanced Cables
UPC - 054651126893
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Useful Information 6 - Appendix Useful Information Cables - balanced or unbalanced? All inputs and outputs on the E-MU Digital Audio System are designed to use either balanced or unbalanced cables. Balanced signals provide an additional +6dB of gain on the inputs and are recommended for best audio performance, although unbalanced cables are fine for most applications. If you're having problems with hum and noise or just want the best possible performance, use balanced cables. Balanced Cables Balanced cables are used in professional studios because they cancel out noise and interference. Connector plugs used on balanced cables are XLR (3-prong mic connector) or TRS (Tip, Ring, Sleeve) 1/4" phone plugs. Balanced XLR Connectors WARNING: Do NOT use balanced audio cables when connecting balanced outputs to unbalanced inputs. Doing so can actually increase noise level and introduce hum. Use balanced (3-conductor) cables ONLY if you are connecting balanced inputs to balanced outputs. Balanced 1/4" TRS Connectors Unbalanced 1/4" Connectors Balanced cables have one ground (shield) connection and two signal-carrying conductors of equal potential but opposite polarity. There is one "hot" or positive lead, and a "cold" or negative lead. At any point in time, both conductors are equal in voltage but opposite in polarity. Both leads may pick up interference, but because it is present both in and out of phase, this interference cancels out at the balanced input connection. Unbalanced Cables Unbalanced cables have one conductor and one ground (shield) and usually connect via unbalanced 1/4" phone plugs or RCA phono plugs. The shield stays at a constant ground potential while the signal in the center conductor varies in positive and negative voltage. The shield completely surrounds the center "hot" conductor and is connected to ground in order to intercept most of the electrical interference encountered by the cable. Unbalanced cables are more prone to hum and interference than balanced cables, but the shorter the cable, the less hum and noise is introduced into the system. E-MU PCIe Digital Audio Systems 115