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In page Electric upright bass:

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EUB players who use the bow need to use the appropriate pickup, microphone, and preamplifier/equalizer combination to avoid the tendency for the amplified tone to be scratchy and high-sounding. To obtain a more natural arco sound, some performers use a condenser microphone for arco passages. Most bass pickups are designed to capture the pizzicato sounds of a double bass rather than the arco sounds. Some pickup manufacturers produce piezoelectric pickups that purportedly provide a natural reproduction of arco sound. Preamplifiers and equalizers for acoustic instruments or double basses can also be used to "roll off" the treble frequencies or "notch out" the "scratchy-sounding" frequencies. An external parametric equalizer could also be used to remove unwanted "scratchy" sounds.