Starting in 1666, Newton showed that these colours were intrinsic to light and could be recombined into white light. Isaac Newton was the first to use the term spectrum for the range of colours that white light could be split into with a prism. Light was intensively studied from the beginning of the 17th century leading to the invention of important instruments like the telescope and microscope. The ancient Greeks recognized that light traveled in straight lines and studied some of its properties, including reflection and refraction. Humans have always been aware of visible light and radiant heat but for most of history it was not known that these phenomena were connected or were representatives of a more extensive principle. See also: History of electromagnetic theory, History of radio, History of electrical engineering, and History of optics Spectroscopy is used to study the interactions of electromagnetic waves with matter. Throughout most of the electromagnetic spectrum, spectroscopy can be used to separate waves of different frequencies, producing a spectrum of the constituent frequencies. Radiation of visible light and longer wavelengths are classified as nonionizing radiation because they have insufficient energy to cause these effects. Extreme ultraviolet, soft X-rays, hard X-rays and gamma rays are classified as ionizing radiation because their photons have enough energy to ionize atoms, causing chemical reactions. There is no known limit for long and short wavelengths. The electromagnetic waves in each of these bands have different characteristics, such as how they are produced, how they interact with matter, and their practical applications. This frequency range is divided into separate bands, and the electromagnetic waves within each frequency band are called by different names beginning at the low-frequency (long-wavelength) end of the spectrum these are: radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays at the high-frequency (short wavelength) end. The electromagnetic spectrum covers electromagnetic waves with frequencies ranging from below one hertz to above 10 25 hertz, corresponding to wavelengths from thousands of kilometers down to a fraction of the size of an atomic nucleus. The electromagnetic spectrum is the range of frequencies (the spectrum) of electromagnetic radiation and their respective wavelengths and photon energies. The X12i-128 offers superior configuration flexibility for easier system design and setup, making it the standout subwoofer choice for any larger-format installed audio application.Entire range of frequencies of electromagnetic radiation A diagram of the electromagnetic spectrum, showing various properties across the range of frequencies and wavelengths, with corresponding wave amplitudes The input panel is fully weatherized, with multiple gland nut sizes to accommodate a range of cable sizes. The input panel provides dual high-current Phoenix style terminal blocks for ease of connectivity. There are four additional M10 hard points on the top of the enclosure for suspending a single subwoofer. The enclosures, available in both RAL9005 black and RAL9003 white, have four M10 hard points on each side of the enclosure for mounting to structural framing. All models utilize stainless steel grilles and hardware for maximum corrosion resistance. In addition to the indoor install models, the IP55 rated fiberglass models are fully weatherized for use in direct exposure outdoor environments. The indoor install models have interlocking feet for ground stack applications and are finished with a polyurea coating for enhanced durability. The enclosure is constructed of weatherresistant plywood. The X12i-128 is a premium solution for fixed install applications. Optimized cardioid settings that can supply up to 30 dB of rejection are an option for maximum versatility in a variety of applications. The software also provides information for the creation of steered/shaped subwoofer arrays. Electro-Voice PREVIEW Loudspeaker Software quickly and accurately calculates array configuration data and coverage predictions. In addition to its extremely high output capability, the X12i-128 is designed to acoustically match seamlessly with any X-Line Advance top cabinet as a ground stack subwoofer or as a flown subwoofer. It is truly a state-of-the-art compact cabinet that delivers more LF output in a smaller footprint than other subwoofers available today. The X-Line Advance X12i-128 subwoofer produces the greatest low-frequency impact and performance EV has ever developed.
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