FIELD: acoustics.
SUBSTANCE: damper of electric turntable support disc is proposed, made of at least two layers. Sound propagation speed in the layers differs by not less than 10 %, wherein the thickness of each layer is in range of 0.1 to 2.5 mm. At that, one layer is made of copper, and second one is made of aluminium, one layer is made of copper, and second is made of molybdenum, one layer is made of copper, and second is made of stainless steel, one layer is made of copper, and second is made of concrete, one layer is made of aluminium, and second is made of glass. Adhesive or glue layer is applied on the surface of one of the layers.
EFFECT: efficient suppression of sound wave energy by an excited pickup needle.
9 cl, 1 tbl
