5.1 System: A designation describing a sound system incorporating 5 channels of sound/ speakers and one subwoofer. Amp: The unit of measure used with an electric current. Amplifier: An electronic component or device that takes low-level signals and recreates the signal with more power. Attenuators: A device that reduces an amplified signal without distortion. Baffle: A box-like structure that a speaker is placed into to enhance the bass sound of the speaker. Bass: The lowest existing frequency range usually below 200 Hz. Bookshelf Speaker: A small speaker which is designed to sit on a bookshelf or shelf. Capacitors: An electrical device that store charges. Center Channel: A third front audio channel that is usually used to enhance the clarity of dialog being heard within a sound system. Co-axial Speaker: A type of speaker driver where the high frequency driver (the tweeter) is located inside a low or mid-frequency driver (the woofer). Crossover: A component that splits up the frequency depending on ranges and directs them to certain drivers. Current: The flow of electricity through a circuit as measured in amps. db Decibel: A logarithmic scale measuring the intensity of the sound pressure level of a noise. Digital Surround Sound: See definition for 5.1. Driver: The cone-like component of a speaker that pushes back and forth to sound waves. Dual Voice Coil: A speaker that accepts both right and left channels into one speaker providing full range sound in a smaller space than two speakers. Floor Standing Speaker: A specific type of speaker enclosure with an acceptable level of sound height that stands directly on the floor. Frequency: The number of repeating sound cycles in a given period, measured in hertz or kilohertz. Human hearing is usually 20Hz to 20KHz with the lower frequencies representing the bass and higher representing the treble. Grille: An aesthetic front plate covering for speakers. Horn: An element used to increase sound efficiency by placing the driver at the end of a megaphone-like structure. Hz (Hertz): Number of cycles per second of sound waves used to measure frequency. Impedance: The resistance to the flow of an electrical current as measured in ohms. kHz (Kilohertz): One thousand sound cycles per second. Magnet: A component of a speaker that uses electromagnets to create movement of the driver reproducing sound. Microphone: A device used to create an electrical signal representative of the sound striking it to be heard over speakers. Midrange: The middle band of audio frequencies between 150/200 Hz to between 1,000/2,000 Hz. Multimeter: A device used to measure different electronic properties. Music on Hold Feature: An amplifier output feature which allows callers on a phone system that are holding to hear music or supplied dialog. Ohm: A measure of resistance in a circuit to an electric current. Outdoor Speaker: A speaker that is weatherproof. Power Rating: The maximum amount of power in watts that an amplifier can put out or a speaker can be driven with. RMS (Root Mean Square): The average continuous power output an amplifier is capable of producing or a speaker is capable of receiving. Subwoofer: A type of speaker used to reproduce the lowest portion of the frequency spectrum, usually 80Hz and below. Sensitivity or SPL: A measure of the sound pressure level measured from a distance of one meter from a speaker when the speaker receives a 2.83-volt signal - -1 watt at 8 ohms. Shielded: A term relating to specific speakers having their magnetic fields contained as to not harm video displays. Three-Way Speaker: A speaker system containing three individual drivers covering three frequency bands. Transformer: An important component of the power supply that pulls electricity from a source and then transforms it into power that can be used in electronic devices. Tweeter: A speaker driver designed for receiving high frequencies usually above 2,000 Hz. Two-Way Speaker: A speaker system with two individual drivers covering two frequency bands. Voice Coil: A tightly wrapped coil of wire attached to a speaker driver's diaphragm and located near the stationary magnet. Watt: A measurement of power obtained by multiplying current by voltage. Woofer: A Speaker driver that handles low frequency signals. XLR Connector: A plug connector usually at the end of a microphone wire that allows easy connection to an amplifier without the need to strip the wire to connect it to screw terminals. |
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