sound damping
91Valve audio amplifier — A valve (UK) audio amplifier or vacuum tube (US) audio amplifier is a valve amplifier used for sound recording, reinforcement, or reproduction. Until the invention of solid state devices such as the transistor, all electronic amplification was… …
92Acoustic transmission lines — An acoustic transmission line is the acoustic analog of the electrical transmission line, typically thought of as a rigid walled tube that is long and thin relative to the wavelength of sound present in it. Pipe organs, woodwinds, and the like… …
93Proximity effect (audio) — The proximity effect in audio refers to a change in the frequency response of a directional microphone as the sound source is brought close to the microphone. The result of the change is a disproportionate increase in the bass response of the… …
94Mission Freedom Loudspeaker — The Mission 770 Freedom was an award winning British loudspeaker produced by Mission Electronics, an audio company based in Huntingdon, United Kingdom. The Freedom model variants date from the late 70s through to the late 80s. In all of its… …
95wood — wood1 woodless, adj. /wood/, n. 1. the hard, fibrous substance composing most of the stem and branches of a tree or shrub, and lying beneath the bark; the xylem. 2. the trunks or main stems of trees as suitable for architectural and other… …
96Wood — /wood/, n. 1. Grant, 1892 1942, U.S. painter. 2. Leonard, 1860 1927, U.S. military doctor and political administrator. * * * I Hard, fibrous material formed by the accumulation of secondary xylem produced by the vascular cambium. It is the… …
97nervous system, human — ▪ anatomy Introduction system that conducts stimuli from sensory receptors to the brain and spinal cord and that conducts impulses back to other parts of the body. As with other higher vertebrates, the human nervous system has two main… …
98Friction — For other uses, see Friction (disambiguation). Classical mechanics …
99Speed — This article is about the property of moving bodies. For persons named Speed, see Speed (name). For the film, see Speed (1994 film). For other uses, see Speed (disambiguation). Classical mechanics …
100Magnetohydrodynamics — For the academic journal, see Magnetohydrodynamics (journal). Magnetohydrodynamics (MHD) (magneto fluid dynamics or hydromagnetics) is an academic discipline which studies the dynamics of electrically conducting fluids. Examples of such fluids… …
