JBL VRX915M PDF

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Active: Powered. An active crossover is electrically powered and divides the line-level signal prior to amplification. An active speaker includes an active crossover and built-in amplifier.

Amplifier: A component that increases the gain or level of an audio signal. Balanced Input: A connection with three conductors: two identical signal conductors that are degrees out of phase with each other, and one ground. This type of connection is very resistant to line noise. Bandpass: A two-part filter that cuts both higher and lower frequencies around a center band. A bandpass enclosure cuts high frequencies by acoustic cancellation and low frequencies by natural physical limitations on bass response.

Bandwidth: In audio, the range of frequencies a device operates within. In video, the range of frequencies passed from the input to the output. Bandwidth can also refer to the transmission capacity of an electronic communications device or system; the speed of data transfer…very important when planning a meeting for the attendees to stay connected. Bass: Low frequencies; those below approximately Hz.

CD: Compact Disc. Ubiquitous digital audio format. Channel: In components and systems, a channel is a separate signal path.

A four-channel amplifier has at least four separate inputs and four separate outputs. Crossover: A component that divides an audio signal into two or more ranges by frequency, sending, for example, low frequencies to one output and high frequencies to another. An active crossover is powered and divides the line-level audio signal prior to amplification. A passive crossover uses no external power supply and may be used either at line level or, more commonly, at speaker level to divide the signal after amplification and send the low frequencies to the woofer and the high frequencies to the tweeter.

Crossover Frequency: The frequency at which an audio signal is divided. Frequencies below 80 Hz are sent to the subwoofer; signals above 80 Hz are sent to the main speakers.

A decibel is one tenth of a Bel. In sound, decibels generally measure a scale from 0 the threshold of hearing to dB the threshold of pain. A 3dB difference equates to a doubling of power. A 10dB difference is required to double the subjective volume. A 1dB difference over a broad frequency range is noticeable to most people, while a 0. Delay: The time difference between a sonic event and its perception at the listening position sound traveling through space is delayed according to the distance it travels.

People perceive spaciousness by the delay between the arrival of direct and reflected sound larger spaces cause longer delays. Diaphragm: The part of a dynamic loudspeaker attached to the voice coil that produces sound. It usually has the shape of a cone or dome. Diffusion: In audio, the scattering of sound waves, reducing the sense of localization. In video, the scattering of light waves, reducing hot spotting, as in a diffusion screen. Most include the processing to make the files, and all have the ability to play them back.

Dispersion: The spread of sound over a wide area. Distortion: Any undesired change in an audio signal between input and the output. Dolby B: A noise-reduction system that increases the level of high frequencies during recording and decreases them during playback.

Dolby C: An improvement on Dolby B that provides about twice as much noise reduction. Dolby Digital: An encoding system that digitally compresses up to 5. When RF-modulated, it was included on some laser discs, which requires an RF-demodulator before the signal can be decoded.

Five channels are full-range; the. A Dolby Digital processor found in most new receivers, preamps, and some DVD players can decode this signal back into the 5. The sixth channel is matrixed from the left and right surround channels. Often referred to as 6.

Sometimes referred to as 7. Software is backwards-compatible with 5. Pro Logic decoders derive left, center, right, and a mono surround channel from two-channel Dolby Surround encoded material via matrix techniques. Adds improved decoding for two-channel, non-encoded soundtracks and music.

Driver: A speaker without an enclosure; also refers to the active element of a speaker system that creates compressions and rarefactions in the air. Manipulating an audio signal digitally to create various possible effects at the output.

Often refers to artificially generated surround effects derived from and applied to two-channel sources. A digital sound recording format, originally developed for theatrical film soundtracks, starting with Jurassic Park.

Records 5. Equalizer: A component designed to alter the frequency balance of an audio signal. Equalizers may be graphic, parametric, or a combination of both. Fade: A gradual increase in audio, i. Feedback: The transmission of current or voltage from the output of a device back to the input, where it interacts with the input signal to modify operation of the device. Frequency: The number of cycles vibrations per second. In audio, audible frequencies commonly range from 20 to 20, cycles per second Hz.

In video, frequency is used to define the image resolution. Low-frequency video images depict large objects or images.

Higher frequencies depict smaller objects finer details. Frequency Response: A measure of what frequencies can be reproduced and how accurately they are reproduced.

A measurement of 20 to 20, Hz, 3dB means those frequencies between 20 and 20, Hz can be reproduced no more than 3 dB above or below a reference frequency level. Full-Range: A speaker designed to reproduce the full range 20 Hz to 20 kHz of audio frequencies. Gain: Increase in level or amplitude. Gooseneck: This refers to amicrophone with a flexible neck that is most frequently attached to a podium or lectern.

It is designed to allow the speaker to raise or lower the microphone to a suitable height. Graphic Equalizer: A type of equalizer with sliding controls that creates a pattern representing a graph of the frequency-response changes. Raising sliders boosts the affected frequencies; lowering sliders cuts attenuates the affected frequencies. High Pass: A filter that passes high frequencies, and attenuates low frequencies. Same as low cut. Hz: Hertz or cycles per second.

Something that repeats a cycle once each second moves at a rate of 1 Hz. Impedance: A measure of the impediment to the flow of alternating current, measured in ohms at a given frequency. Larger numbers mean higher resistance to current flow. KHz: Kilohertz or one thousand Hz. Lavaliere: A small microphone that attaches to clothing, allowing the speaker to have a hands-free presentation.

A Line Array is perfect for medium to large audiences. Midbass: The middle of the bass part of the frequency range, from approximately 50 to Hz upper bass would be from to Hz. Also used as a term for loudspeaker drivers designed to reproduce both bass and midrange frequencies.

Midrange: The middle of the audio frequency range. Also used as a term for loudspeaker drivers designed to reproduce this range. Mixer: This is the unit in which audio signals are directed from. A mixer provides for both mic and line input combinations while allowing you to control one or more outputs.

Compression scheme used to transfer audio files via the Internet and store in portable players and digital audio servers. NATS can be used to help characterize the setting. Noise: An unwanted portion of a signal such as hiss, hum, whine, static, or buzzing. Passive: Not active. A passive crossover uses no external power and results in insertion loss.

A passive speaker is one without internal amplification. Power Output: A measure, usually in watts, of how much energy is modulated by a component. Preamplifier: A control and switching component that may include equalization functions. The preamp comes in the signal chain before the amplifiers. Processors: Anything that processes an incoming signal in some way. Surround processors, for example, can decode a Dolby Digital signal to send to an amp so you can hear it.

Pulse Code Modulation: PCM a way to convert sound or analog information to binary information 0s and 1s by taking samples of the sound and record the resulting number as binary information. It can sometimes be found on DVD-Video. RF: Radio Frequency. VCRs and DBS receivers often include channel 3 or 4 modulators, allowing the output signal to be tuned by the television on those channels.

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