Each input device is plugged into a separate channel in the mixer which controls its routing through all other components of the sound system. - The channel strip is at the core of the mixing console’s functionality.Their operation is, however, very straightforward and logical if you keep the purpose of their various functions in perspective. Mixers can appear intimidating with their dense array of knobs, buttons, faders, lights and displays. They are available in analog and digital flavours, but they are all designed with the same architecture. The mixing console (mixer) is the heart of the sound system. It is the device that controls how the input signals are routed to various signal processors and output devices (loudspeakers) connected to the system. The ground conductor is woven into a mesh surrounding the other two wires which provides an electromagnetic shield to reduce the cables’ susceptibility to electromagnetic noise. This means that two of the three conductors are dedicated to carrying the ‘hot’ and ‘cold’ path for the circuit carrying the signal, and the third conductor connects the ground of each component. The electrical circuit used to pass a signal between sound equipment is ‘balanced’. 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.
In most cases, it will consist of either a microphone or a direct input (DI) box. A 12dB per octave, 3dB down at 50Hz low-cut filter can also be switched in if required.įrom its extended frequency response and excellent dynamic range, to the quality components and meticulous attention to detail, the 231s offers exceptional sound and rugged reliability.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. A global control provides +/-12 dB of input gain. The unit features 20mm non-conductive sliders that can be set to either +/-6dB or +/-12dB of boost or cut. The processor is equally suitable for live applications, audio installations, and for use in a studio. The 231s from dbx is a dual channel, 31 band, 1/3 octave graphic equalizer housed in a dual space, rack mount chassis.
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