Editing Instrument amplifier (section)

===Bass===
{{Main|Bass amplifier}}
[[Bass instrument amplification|Bass amplifiers]] are designed for [[bass guitar]]s or more rarely, for [[double bass|upright bass]]. They differ from amplifiers for the electric guitar in several respects, with extended low-frequency response, and tone controls optimized for the needs of bass players.

Higher-cost bass amplifiers may include built-in [[bass effects]] units, such as [[audio compressor]] or limiter features, to avoid unwanted distorting at high volume levels and potential damage to speakers; equalizers; and [[bass overdrive]]. 

Bass amps may provide an XLR [[DI unit|DI output]] for plugging the bass amp signal directly into a [[mixing board]] or [[PA system]]. Larger, more powerful bass amplifiers (300 or more watts) are often provided with internal or external metal [[heat sink]]s and/or fans to help keep the components cool. 

Speaker cabinets designed for bass usually use larger [[loudspeakers]] (or more loudspeakers, such as four ten-inch speakers) than the cabinets used for other instruments, so that they can move the larger amounts of air needed to reproduce low frequencies. Bass players have to use more powerful amplifiers than the electric guitarists, because deep bass frequencies take more power to amplify{{citation needed|reason=Frequency has no bearing on actual amplitude of an amplified signal.|date=December 2016}}. While the largest speakers commonly used for regular electric guitar have twelve-inch cones, electric bass speaker cabinets often use 15" speakers. Bass players who play styles of music that require an extended low-range response, such as [[death metal]], sometimes use speaker cabinets with 18" speakers or add a large [[subwoofer]] cabinet to their rig.

Speakers for bass instrument amplification tend to be heavier-duty than those for regular electric guitar, and the speaker cabinets are typically more rigidly constructed and heavily braced, to prevent unwanted buzzes and rattles. Bass cabinets often include [[bass reflex]] ports, vents or openings in the cabinet, which improve the bass response and low-end, especially at high volumes.

[[Image:Amplifier1.jpg|thumb|A small keyboard amplifier suitable for at-home practice capable of mixing the inputs from two keyboards.]]