The cables used to connect components of a sound system have three wires (conductors), similar to the three prong plug used to supply power to grounded electrical equipment.
The phase inversion switch (Ø) reverses the polarity of the transformer’s output to the sound system (more on this in the acoustics section). A ground lift allows the sound system’s common ground (shared by all the components in the sound system) to be isolated from the source signal’s ground. A pad is basically a heavy-duty volume control to permit the input of amplified sources. Most DI boxes have a “thru” output that allows an instrument’s sig nal to continue (unaffected) to an amplifier after passing through the transformer’s windings. DI boxes are available with a number of features that can include: a ‘pad’, ground lift, and phase inversion. The instrument’s signal passes through a wire which induces a similar current in another wire that is wound (many times) around it. - DI boxes are essentially just transformers.- Microphones are generally selected to complement the qualities of the sound source that they will be used to detect (more on this in the section about microphones and loudspeakers).The characteristics and features of these devices vary widely between different manufacturers and models. These devices convert the sound or the electrical signal from an instrument or voice into an electrical signal that is compatible with the components of a sound system. Signal flow diagram illustrating the path that a signal follows in a typical PA system.Īn input device is the interface between a sound source and the sound system. In most cases, it will consist of either a microphone or a direct input (DI) box.
0 kommentar(er)
