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A noise-cancellation speaker emits a sound wave with the same amplitude but with an inverted phase (also known as antiphase) relative to the original sound. The waves combine to form a new wave, in a process called interference , and effectively cancel each other out – an effect which is called destructive interference .
Most of the amplifiers produced by ACC were solid-state, but a few models later in production were valve amps. The company is remembered in particular for its Acoustic 361 bass stack, consisting of an Acoustic 360 bass pre-amplifier and one or two Acoustic 361 W-bins, each featuring a built-in 200-watt RMS power amplifier and a rear-facing 18" Cerwin-Vega loudspeaker.
NHT Loudspeakers (Now Hear This), often colloquially referred to as NHT Audio, [1] is an American loudspeaker and audio component company based in Benicia, California. The company was founded by Chris Byrne and Ken Kantor in December 1986. [2] NHT home theater products have historically included loudspeakers, A/V processors, and amplifiers. NHT ...
There are two variations of the "Delta Blues" model, the Delta Blues with one fifteen-inch speaker or two ten-inch speakers. They use 12AX7 preamp tubes, EL84 power tubes, and have spring reverb tanks. From 1994 to 1997, a 15 watts amp with a 10 inches speaker was also produced, the Peavey Classic 20.
The noise properties of valves at audio frequencies can be modelled well by a perfect noiseless valve having a source of voltage noise in series with the grid. For the EF86 low-noise audio pentode valve, for example, this voltage noise is specified (see e.g., the Valvo, Telefunken or Philips data sheets) as 2 microvolts integrated over a ...
The white van speaker scam is a scam sales technique in which a con artist makes a buyer believe they are getting a good price on home entertainment products. Often a con artist will buy inexpensive, generic speakers [1] and convince potential buyers that they are premium products worth hundreds or thousands of dollars, offering them for sale at a price that the buyer thinks is heavily ...
The middle speaker is a real loudspeaker. The top and bottom cones are passive radiators. In the same way as a ported loudspeaker, a passive radiator system uses the sound pressure otherwise trapped in the enclosure to excite a resonance that makes it easier for the speaker system to create the deepest pitches (e.g., basslines). The passive ...