{"product_id":"jbl-jrx218s","title":"JBL JRX218S","description":"\u003ch3\u003eOverview\u003c\/h3\u003e\u003cdiv id=\"overview\"\u003e The JRX218S is driven by a massive JBL 18\" \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Woofer:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The low frequency driver in a multi driver speaker.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003ewoofer\u003c\/span\u003e with a cast frame and 3\" voice-coil. \u003c\/div\u003e\u003ch3\u003eFeatures\u003c\/h3\u003e\u003cdiv id=\"features\"\u003e \u003cul class=\"list\"\u003e \u003cli\u003e 18 in. compact \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Subwoofer:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;A subwoofer (or \" sub is a woofer or complete loudspeaker typically between and in diameter which dedicated to the reproduction of low-pitched audio frequencies typical range for subwoofer about hz. subs are used augment performance main loudspeakers. subwoofers constructed by mounting one more woofers well-braced wood plastic enclosure.\u003e] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u0026gt;subwoofer\u003c\/span\u003e. \u003c\/li\u003e \u003cli\u003e 350 W (continuous), 1400 W (\u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Peak:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The opposite of dipping. A peak is an EQ curve that looks like a hill, or a peak. Peaking with an equalizer amplifies a band of frequencies. Peaking also can refer to a very strong signal in an audio path that is overloading or clipping.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003epeak\u003c\/span\u003e) \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Power:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The rate at which electrical energy is applied to or taken from a device. It is expressed in terms of watts, milliwatts or microwatts.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003epower\u003c\/span\u003e capacity. \u003c\/li\u003e \u003cli\u003e The rugged \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Enclosure:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;A box that contains the driver(s).\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003eenclosure\u003c\/span\u003e is constructed from 19 \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; mm:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;One thousandth of a meter (0.039 in.).\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003emm\u003c\/span\u003e (.75 in) MDF (Medium Density Fiberboard) using advanced adhesives and mechanical fastener technology for durability and improved low-\u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Frequency:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The number of times a periodic waveform cycles, or repeats, over a period of time.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003efrequency\u003c\/span\u003e performance. The \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Enclosure:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;A box that contains the driver(s).\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003eenclosure\u003c\/span\u003e is covered in black carpet. \u003c\/li\u003e \u003cli\u003e A top mounted, cast \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Aluminum:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;Aluminium or aluminum is a silvery white and ductile member of the boron group of chemical elements. It has the symbol Al; its atomic number is 13. It is not soluble in water under normal circumstances. Aluminium is the most abundant metal in the Earth's crust, and the third most abundant element therein, after oxygen and silicon. It makes up about 8% by weight of the Earth's solid surface. Aluminium is too reactive chemically to occur in nature as a free metal. Instead, it is found combined in over 270 different minerals. The chief source of aluminium is bauxite ore.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003ealuminum\u003c\/span\u003e 36 \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; mm:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;One thousandth of a meter (0.039 in.).\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003emm\u003c\/span\u003e pole mount receptacle can receive an optional SS3BK pole to facilitate use of the JRX218S as a base for a midhigh \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Speaker:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;A loudspeaker (or \" speaker is an electroacoustic transducer that converts electrical signal into sound. the pulses in accordance with variations of and causes sound waves to propagate through a medium such as air or water.\u003e\u003cbr\u003eLoudspeakers (and other electroacoustic transducers) are the most variable elements in a modern audio system and are usually responsible for most distortion and audible differences when comparing sound systems.] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u0026gt;speaker\u003c\/span\u003e cabinet. \u003c\/li\u003e \u003cli\u003e Non-resonant, all steel handles are used. \u003c\/li\u003e \u003cli\u003e Attractive 18-gauge perforated steel grille protects components from damage. \u003c\/li\u003e \u003c\/ul\u003e \u003c\/div\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cdiv id=\"specifications\"\u003e \u003cul class=\"list\"\u003e \u003cli\u003e \u003cspan class=\"spec\"\u003e\u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Power:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The rate at which electrical energy is applied to or taken from a device. It is expressed in terms of watts, milliwatts or microwatts.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003ePower\u003c\/span\u003e Rating \u003c\/span\u003e: 350 W \/ 1400 W \u003c\/li\u003e \u003cli\u003e \u003cspan class=\"spec\"\u003e\u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Frequency Range:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The actual range or span of frequencies from low to high that a unit can pass or reproduce. In terms of audio recording studios, this is usually limited to the range of 20 Hz to 20,000 Hz, which represents the full range of human hearing.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003e\u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Frequency:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The number of times a periodic waveform cycles, or repeats, over a period of time.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003eFrequency\u003c\/span\u003e Range\u003c\/span\u003e (-10 \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; dB:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The decibel (dB) is a logarithmic unit of measurement that expresses the magnitude of a physical quantity (usually power or intensity) relative to a specified or implied reference level. Since it expresses a ratio of two (same unit) quantities, it is a dimensionless unit. A decibel is one tenth of a bel (B).We perceive loudness of sound as the logarithm of the actual sound intensity, and dB (decibels) are a logarithmic scale.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003edB\u003c\/span\u003e) \u003c\/span\u003e: 34 \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Hz:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;A unit of measure of the frequency of a vibrating object, such as a guitar string, speaker cone or electrical signal. Equivalent to cycles per second, it is named for Heinrich Hertz and abbreviated \" hz.\u003e] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u0026gt;Hz\u003c\/span\u003e - 250 \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Hz:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;A unit of measure of the frequency of a vibrating object, such as a guitar string, speaker cone or electrical signal. Equivalent to cycles per second, it is named for Heinrich Hertz and abbreviated \" hz.\u003e] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u0026gt;Hz\u003c\/span\u003e \u003c\/li\u003e \u003cli\u003e \u003cspan class=\"spec\"\u003e\u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Frequency Response:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;(Example, 30-20,000 Hz) Describes the audible range of frequencies that an audio system will reproduce. (Note: All else being equal, the lower the low number, the better the bass response and the higher the high number, the better the treble response.)\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003e\u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Frequency Response:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The actual range or span of frequencies from low to high that a unit can pass or reproduce. In terms of audio recording studios, this is usually limited to the range of 20 Hz to 20,000 Hz, which represents the full range of human hearing.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003e\u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Frequency:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The number of times a periodic waveform cycles, or repeats, over a period of time.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003eFrequency\u003c\/span\u003e Response\u003c\/span\u003e\u003c\/span\u003e (+\/-3 \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; dB:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The decibel (dB) is a logarithmic unit of measurement that expresses the magnitude of a physical quantity (usually power or intensity) relative to a specified or implied reference level. Since it expresses a ratio of two (same unit) quantities, it is a dimensionless unit. A decibel is one tenth of a bel (B).We perceive loudness of sound as the logarithm of the actual sound intensity, and dB (decibels) are a logarithmic scale.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003edB\u003c\/span\u003e) \u003c\/span\u003e: 53 \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Hz:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;A unit of measure of the frequency of a vibrating object, such as a guitar string, speaker cone or electrical signal. Equivalent to cycles per second, it is named for Heinrich Hertz and abbreviated \" hz.\u003e] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u0026gt;Hz\u003c\/span\u003e - 250 \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Hz:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;A unit of measure of the frequency of a vibrating object, such as a guitar string, speaker cone or electrical signal. Equivalent to cycles per second, it is named for Heinrich Hertz and abbreviated \" hz.\u003e] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u0026gt;Hz\u003c\/span\u003e \u003c\/li\u003e \u003cli\u003e \u003cspan class=\"spec\"\u003e\u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Sensitivity:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;A measure of the relative efficiency of a speaker or loudspeaker system, often expressed as the number of decibels the unit will produce fed from a 1-watt signal measured at a distance of one meter.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003eSensitivity\u003c\/span\u003e (@1m) \u003c\/span\u003e: 98 \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; dB:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The decibel (dB) is a logarithmic unit of measurement that expresses the magnitude of a physical quantity (usually power or intensity) relative to a specified or implied reference level. Since it expresses a ratio of two (same unit) quantities, it is a dimensionless unit. A decibel is one tenth of a bel (B).We perceive loudness of sound as the logarithm of the actual sound intensity, and dB (decibels) are a logarithmic scale.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003edB\u003c\/span\u003e \u003c\/li\u003e \u003cli\u003e \u003cspan class=\"spec\"\u003eNominal Impedence \u003c\/span\u003e: 4 \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Ohms:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The unit by which resistance to electrical current is measured. From Ohm's Law (Current=Voltage\/Resistance, or in other words, Current=Voltage\/Ohms), a mathematical expression of the relationship between these three elements. It is also symbolized by the Greek capital letter omega (Ω).\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003eohms\u003c\/span\u003e \u003c\/li\u003e \u003cli\u003e \u003cspan class=\"spec\"\u003eRecommended \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Amplifier:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;Generally, an amplifier is any device that will convert one signal (often with a very small amount of energy, a few milliwatts) into another signal (often with a larger amount of energy e.g. several hundred watts). A power amplifier converts a low-power signal from a pre-amplifier into a high-power signal (tens to hundreds of watts) needed to drive a loudspeaker.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003eAmplifier\u003c\/span\u003e \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Power:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The rate at which electrical energy is applied to or taken from a device. It is expressed in terms of watts, milliwatts or microwatts.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003ePower\u003c\/span\u003e \u003c\/span\u003e: 350 W to 700 W into 4 \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Ohms:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The unit by which resistance to electrical current is measured. From Ohm's Law (Current=Voltage\/Resistance, or in other words, Current=Voltage\/Ohms), a mathematical expression of the relationship between these three elements. It is also symbolized by the Greek capital letter omega (Ω).\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003eohms\u003c\/span\u003e \u003c\/li\u003e \u003cli\u003e \u003cspan class=\"spec\"\u003eMaximum \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; SPL:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;Sound pressure is the local pressure deviation from the ambient (average, or equilibrium) pressure caused by a sound wave. Sound pressure can be measured using a microphone in air and a hydrophone in water. The SI unit for sound pressure is the pascal (symbol: Pa). The instantaneous sound pressure is the deviation from the local ambient pressure p0 caused by a sound wave at a given location and given instant in time. The effective sound pressure is the root mean square of the instantaneous sound pressure over a given interval of time (or space). In a sound wave, the complementary variable to sound pressure is the acoustic particle velocity. For small amplitudes, sound pressure and particle velocity are linearly related and their ratio is the acoustic impedance. The acoustic impedance depends on both the characteristics of the wave and the medium. The local instantaneous sound intensity is the product of the sound pressure and the acoustic particle velocity and is, therefore, a vector quantity.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003eSPL\u003c\/span\u003e \u003c\/span\u003e: 133 \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; dB:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The decibel (dB) is a logarithmic unit of measurement that expresses the magnitude of a physical quantity (usually power or intensity) relative to a specified or implied reference level. Since it expresses a ratio of two (same unit) quantities, it is a dimensionless unit. A decibel is one tenth of a bel (B).We perceive loudness of sound as the logarithm of the actual sound intensity, and dB (decibels) are a logarithmic scale.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003edB\u003c\/span\u003e \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Peak:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The opposite of dipping. A peak is an EQ curve that looks like a hill, or a peak. Peaking with an equalizer amplifies a band of frequencies. Peaking also can refer to a very strong signal in an audio path that is overloading or clipping.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003epeak\u003c\/span\u003e, @1 m (3.3 \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; ft:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;Traditional standards for the exact length of an inch have varied in the past, but since July 1959 when the international yard was defined as 0.9144 metres, the international inch has been exactly 25.4 mm. There are 12 inches in a foot and 36 inches in a yard.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003eft\u003c\/span\u003e) \u003c\/li\u003e \u003cli\u003e \u003cspan class=\"spec\"\u003eDimensions (H x W x D) \u003c\/span\u003e: 605 \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; mm:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;One thousandth of a meter (0.039 in.).\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003emm\u003c\/span\u003e x 508 \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; mm:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;One thousandth of a meter (0.039 in.).\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003emm\u003c\/span\u003e x 551 \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; mm:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;One thousandth of a meter (0.039 in.).\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003emm\u003c\/span\u003e (23.8 in x 20.0 in x 21.7 in) \u003c\/li\u003e \u003cli\u003e \u003cspan class=\"spec\"\u003eNet Weight \u003c\/span\u003e: 32.2 kg (71 lb) \u003c\/li\u003e \u003cli\u003e \u003cspan class=\"spec\"\u003eLow \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Frequency:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The number of times a periodic waveform cycles, or repeats, over a period of time.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003eFrequency\u003c\/span\u003e \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Driver:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;A speaker driver is an individual transducer that converts electrical energy to sound waves, typically as part of a loudspeaker, television, or other electronics device. Sometimes the transducer is itself referred to as a speaker, particularly when a single one is mounted in an enclosure or as surface-mounted device (as in a wall-mounted speaker, car audio speaker, and so on). There are many different types of speaker drivers. The most common ones are the woofer, mid-range and tweeter, as well as subwoofers which are becoming very common. Less common types of speaker drivers are supertweeters and rotary woofers, a new technology that is still proprietary of Eminent Technology.\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003eDriver\u003c\/span\u003e \u003c\/span\u003e: M118-4 \u003c\/li\u003e \u003cli\u003e \u003cspan class=\"spec\"\u003eInput Connectors \u003c\/span\u003e: Neutrik \u003cspan class=\"dictionary\" title=\"header=[\u0026lt;span class=boxoverheaderplain\u0026gt;Definition of\u0026lt;\/span\u0026gt; Speakon:] body=[\u0026lt;table\u0026gt;\u0026lt;td\u0026gt;The Speakon is a type of cable connector, originally manufactured by Neutrik, mostly used in professional audio systems for connecting loudspeakers to amplifiers. The same manufacturer produces another connector dubbed PowerCon, which is designed to carry mains power rather than audio signal. The audio and power designs cannot connect to each other.\u0026lt;br\u0026gt;\u0026lt;br\u0026gt;\u0026lt;br\u0026gt;\u0026lt;br\u0026gt;A Speakon connector is designed with a locking system that may be designed for soldered or screw-type connections. Line connectors (female) mate with (male) panel connectors and typically a cable will have identical connectors at both ends. If it is needed to join cables, a coupler can be used (which essentially consists of two panel connectors mounted on the ends of a plastic tube). Recently the manufacturer has introduced a new series called STX which includes also male line connectors and female panel connectors (in the four-pole and eight-pole version only).\u0026lt;\/td\u0026gt;\u0026lt;\/tr\u0026gt;\u0026lt;\/table\u0026gt;] cssheader=[boxoverheader] cssbody=[boxoverbody]\"\u003eSpeakon\u003c\/span\u003e NL-4 (x2); parallel \u003c\/li\u003e \u003cli\u003e \u003cspan class=\"spec\"\u003eGrille \u003c\/span\u003e: 18-gauge, powder-coated steel \u003c\/li\u003e \u003c\/ul\u003e \u003c\/div\u003e","brand":"JBL","offers":[{"title":"Default Title","offer_id":43892934869035,"sku":"JBL-JRX218S","price":442.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0642\/3019\/5243\/files\/jrx218s_back_z__94720.1682442203.1280.1280.jpg?v=1775679542","url":"https:\/\/www.empirepro.com\/products\/jbl-jrx218s","provider":"Empire Pro","version":"1.0","type":"link"}