Rumble (noise)

Rumble (noise)

A rumble is a form of low-frequency noise created by a random sound wave existing between certain limitation points. In audio rumble refers to a low frequency sound from the bearings inside a turntable. This is most noticeable in low quality turntables with ball bearings. Higher quality turntables use slide bearings, minimizing rumble.

Some phono pre-amplifiers implement a rumble filter, in an attempt to remove the noise. A heavier platter can also help dampen this.

Rumble measurement is carried out on turntables (for vinyl recordings) which tend to generate very low frequency noise originating from the centre bearing and from drive pulleys or belts, as well as from irregularities in the record disc itself.

It can be heard as low-frequency noise and becomes a serious problem when playing records on audio systems with a good low-frequency response. Even when not audible, rumble can cause intermodulation, modulating of the amplitude of other frequencies. The ‘unweighted’ response curve is intended for use in assessing the level of inaudible rumble with such intermodulation in mind.

Read more about Rumble (noise):  Turntable Design, Rumble Filters

Famous quotes containing the word rumble:

    The rumble of a subway train,
    the rattle of the taxis.
    Al Dubin (1891–1945)