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The 131 Marine Speaker was a flushmount speaker that was meant to be installed on a boat, and could be connected to the boat's receiver. The Freespace 51 is an "in-ground" landscape speaker that features omnidirectional, 360-degree sound projection, as well as a bass port.
The best waterproof Bluetooth speakers play your tunes loud and don't mind getting wet. Squeezing in a few more trips to the beach or the pool this summer? The best waterproof Bluetooth speakers ...
Later Polk speaker models used arrays of drivers—Stereo Dimensional Array (SDA)—to cancel the crosstalk from the left speaker to the right ear and from the right speaker to the left ear, so as to expand the stereo image beyond the space between two stereo speakers. The SDA effect is used in some current Polk speakers.
An NYPD LRAD on top of a police humvee An LRAD operator wearing hearing protection LRAD on a navy ship. A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance.
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KEF introduced the world's first coincident-source speaker driver, called Uni-Q, in 1988, which is now in its 12th generation; and it is still featured in almost all its speakers today. KEF is the first company in the HiFi industry to use metamaterial to absorb the unwanted sound from the rear of a speaker driver; the technology is called ...
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