Mackie HM54 Owner's Manual - Page 12
Appendix B: Connections
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HM-54 Appendix B: Connections 1/4" TRS Phone Plugs and Jacks Unbalancing a Line "TRS" stands for Tip-Ring-Sleeve, the three connection points available on a stereo 1/4" or balanced phone jack or plug. TRS jacks and plugs are used for balanced signals and stereo headphones. Balanced Mono RING SLEEVE SLEEVE RING TIP TIP RING TIP SLEEVE 1/4" TRS Balanced Mono Wiring: Sleeve = Shield Tip = Hot (+) Ring = Cold (-) Stereo Headphones RING SLEEVE SLEEVE RING TIP TIP RING TIP SLEEVE 1/4" TRS Stereo Unbalanced Wiring: Sleeve = Shield Tip = Left Ring = Right 1/4" TS Phone Plugs and Jacks "TS" stands for Tip-Sleeve, the two connection points available on a mono 1/4" phone jack or plug. They are used for unbalanced signals like the high-impedance instrument inputs on the Onyx 400F. In most studio, stage, and sound reinforcement situations, there is a combination of balanced and unbalanced inputs and outputs on the various pieces of equipment. This usually will not be a problem in making connections. • When connecting a balanced output to an unbalanced input, use a 1/4" TRS plug on the balanced end and a 1/4" TS plug on the unbalanced end. Be sure the signal high (hot) connections are wired to each other (tip to tip), and that the balanced signal low (cold, ring) goes to the ground (earth, shield) connection at the unbalanced input. In most cases, the balanced ground (earth) will also be connected to the ground (earth) at the unbalanced input. If there are ground-loop problems, this connection may be left disconnected at the balanced end. • When connecting an unbalanced output to a balanced input, use a 1/4" TS plug on the unbalanced end and a 1/4" TRS plug on the balanced end. Be sure that the signal high (hot) connections are wired to each other (tip to tip). The unbalanced ground (earth) connection should be wired to the low (cold, ring) and the ground (earth, shield) connections of the balanced input. If there are ground-loop problems, try disconnecting the unbalanced ground (earth) connection from the balanced input ground (earth) connection, leaving the unbalanced ground connected to the balanced input low (cold) connection only. In some cases, you may have to make up special adapters to interconnect your equipment. For example, you may need a balanced XLR female connected to an unbalanced 1/4" TS phone plug. Many common adapters can be found at your local electronics supply store. SLEEVE SLEEVE TIP Mults and "Y"s TIP A mult or "Y" connector allows you to route one output TIP to two or more inputs by simply providing parallel SLEEVE wiring connections. You can make "Y"s and mults for the 1/4" TS Unbalanced Wiring: outputs of both unbalanced and balanced circuits. Sleeve = Shield Tip = Hot (+) 12 HM-54 Y-Cord Splitter