What makes a good bass amp?

In contrast, instrument amplifiers are often designed to add additional tonal coloration to the original signal or emphasize certain frequencies. For electric instruments such as electric guitar, the amplifier has a major role in the creation of the instrument's tone. Instrument amplifiers that provide distortion (clipping) or dissimilarities between the input and output signals are sought out by musicians in many genres. Many instrument amplifiers for electric guitar and bass allow performers to add distortion by boosting the input signal gain.