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Large port area for reduced distortion. A large port helps to extend low frequency response while reducing compression and turbulence. This requires an RF demodulator usually referred to as an AC3-RF demodulator before or in the surround processor to decode the signal. Is compatible with any and all soundtrack formats. Also used as a term for loudspeaker drivers designed to reproduce both bass and midrange frequencies.

A component that converts electrical energy into acoustical energy. Hertz or cycles per second. In audio, audible frequencies commonly range from 20 to 20, cycles per second Hz. It is designed to allow the speaker to raise or lower the microphone to a suitable height.

A type of equalizer with sliding controls that creates a pattern representing a graph of the frequency-response changes. A comparison of the signal level relative to the noise level. The preamp comes in the signal chain before the amplifiers. Equalizers may be graphic, parametric, or a combination of both. A 20mm threaded pole socket on the top panel allows you to securely mount a satellite speaker on top of the subwoofer.


Television signals are modulated onto RF signals and are then demodulated by your television’s tuner. VCRs and DBS receivers often include channel 3 or 4 modulators, allowing the output signal to be tuned by the television on those channels.

Larger numbers mean higher resistance to current flow. Low-frequency video images depict large objects or images. A measure, usually in watts, of how much energy is modulated by a component.

A measure of the impediment to the flow of alternating current, measured in ohms at a given frequency. Same as low cut. These words all refer to the initial few seconds of audio signifying the beginning of the production. In video, frequency is used to define the image resolution. An unwanted portion of a signal such as hiss, sbwoofer, whine, static, or buzzing.

A gradual increase in audio, i. Feedback is positive when it’s in phase with the input and negative when it’s out of phase. Nobody agrees on which. The middle of the bass part of the frequency sr7x18s, from approximately 50 to Hz upper bass would be from to Hz. The SRXS 18″ W Front-Firing Subwoofer from JBL is a compact subwoofer that delivers powerful bass performance, ideal for low-frequency support alongside subwooferr speakers, or as part of a subwoofer array.

Also, laser discs used an RF signal for modulating Dolby Digital 5. A component designed to alter the frequency balance of an audio signal. Higher frequencies depict smaller objects finer details.

Time relationship between signals; it’s all relative. A speaker designed to reproduce very low bass frequencies, usually those below about 80 Hz.

JBL SRX718S Used, Second hand

Anything that processes an incoming signal in some way. Surround processors, for example, can decode srx7718s Dolby Digital signal to send to an amp so you can hear it.


Stands for either Tom Holman’s eXperiment, after the engineer who drafted the original standard, or is named after the company’s founder George Lucas’ first movie, THX The number of cycles vibrations per second. Raising sliders boosts the affected frequencies; lowering sliders cuts attenuates the affected frequencies. A filter that passes high frequencies, and attenuates low frequencies.

A Line Array is perfect for medium to large audiences. It can sometimes be found on DVD-Video. NATS can be used to help characterize the setting.

JBL SRXS 18″ W Front-Firing Subwoofer SRXS B&H

A mixer provides for both mic and line input combinations while allowing you to control one or more outputs. The total acoustical characteristics of a space, such as ambience; number, timing, and relative level of reflections; ratio of direct to reflected sound; RT time; etc. Increase in level or amplitude. The sub has a strong ply birch enclosure that is internally braced for durability and exceptional sonic performance.

Kilohertz or one thousand Hz. Last items in stock! Be the first to review this item. A measure of what frequencies can be reproduced and how accurately they are reproduced. This system allows attendees to hear the meeting in their own language. Certification program for home theater equipment.