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Parametric equalizers are also sold as standalone outboard gear units. A variant of the parametric equalizer is the semi- parametric equalizer, also known as a sweepable filter. It allows users to control the amplitude and frequency, but uses a pre-set bandwidth of the center frequency. In some cases, semi-parametric equalizers allow the user to select between a wide and a narrow preset bandwidth.
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This involves three adjustments: selection of the center frequency (in Hz), adjustment of the Q which determines the sharpness of the bandwidth, and the level or gain control which determines how much those frequencies are boosted or cut relative to frequencies much above or below the center frequency selected. In a semi- parametric equalizer there is no control for the bandwidth (it is preset by the designer) or is only selected between two presets using a switch. In a quasi-parametric equalizer, the bandwidth is depending on the gain level. With rising gain, the bandwidth gets wider.
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Some higher-cost amps may have a parametric equalizer (or a semi-parametric equalizer) for some frequency ranges (typically the middle frequency range), which can be used to modify the bass tone to suit different styles or performance venues. Some bass amps have a 15 or 20 dB pad which can be used to attenuate "hot" signals, such as basses with an internal preamplifier (depending on the model of amplifier, some brands may provide two inputs (high and low gain) instead of providing a "pad". This pad can be turned on using a button. Some bass amps have an even stronger pad, a 40 dB pad.
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