The location of the
turntable with respect to the loudspeakers should be carefully studied, as they
often appear coupling or feedbacks that appear in the form of annoying hum that
come to completely prevent hearing. This phenomenon is called Larsen effect and
is caused when the sound waves generated by the loudspeakers affect the
turntable whether traveling through the air or more frequently when propagating
the furniture, walls and roofs. When vibrating the entire turntable, the
cartridge detects these vibrations and injects them again in the amplifier,the
which the delivery again to the loudspeakers and thus successively.
The point
at which the phenomenon of the Larsen effect is manifested depends, in addition
to the relative position of the stereo turntable player and loudspeakers, of
the level of power to which it is being worked, being evident that the Larsen
phenomenon is presented more easily the greater the level of power.
When the stereo
turntable is designed, it is necessary to take into account this Larsen
phenomenon and provide it with dampening elements that prevent the turntable
from being easily reached by the vibrations that come through its support
bases. To minimize this phenomenon is precise to move away to the maximum the stereo
turntable of the loudspeakers.
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