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DC Event Lighting and Sound is a full-service provider for lighting, staging and sound solutions to the special event industry catering to the greater Washington D.C., Virginia and Maryland areas.

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Planning a corporate event? Our rental department has what you need to flawlessly execute your next corporate resentation, product launch and more. Inquire with DCELS about rojector rentals, pipe and base, uplighting, branded corporate gobo, and more.

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Equalizers exist in sound reinforcement systems in two forms: graphic and parametric. A high-pass (low-cut) and/or low-pass (high-cut) filter may also be included. Parametric equalizers are often built into each channel in mixing consoles and are also available as separate units. Parametric equalizers first became popular in the 1970s and have remained the program equalizer of choice for many engineers since then.

Graphic equalizers have faders (slide controls) which together resemble a frequency response curve plotted on a graph. Sound reinforcement systems typically use graphic equalizers with one-third octave frequency centers. These are typically used to equalize output signals going to the main loudspeaker system or the monitors on stage.

High-pass (low-cut) and low-pass (high-cut) filters restrict a given channel's bandwidth extremes. Cutting very low frequency energy (termed infrasonic, or subsonic, a misnomer) reduces the waste of amplifier power which does not produce sound and which moreover can be hard on the speakers. A low-pass filter to cutultrasonic energy is useful to prevent interference from radio frequencies, lighting control, or digital circuitry creeping into the power amplifiers. Such filters are often included with graphic and parametric equalizers to give full control of the frequency range. If their response is steep enough, high-pass filters and low-pass filters function as end-cut filters. A feedback suppressor is an automatically-adjusted band-reject or notch filter which includes a microprocessor to detect the onset of feedback and direct the filter to suppress the feedback by lowering the gain right at the offending frequency.