Editing Subwoofer (section)

===Bass instrument amplification===
In rare cases, sound reinforcement subwoofer enclosures are also used for [[bass instrument amplification]] by [[electric bass]] players and [[synth bass]] players. For most bands and most small- to mid-size venues (e.g. nightclubs and bars), standard bass guitar speaker enclosures or keyboard amplifiers will provide sufficient sound pressure levels for onstage monitoring. Since a regular electric bass has a low "E" (41&nbsp;Hz) as its lowest note, most standard bass guitar cabinets are only designed with a range that goes down to about 40&nbsp;Hz. However, in some cases, performers wish to have extended sub-bass response that is not available from standard instrument speaker enclosures, so they use subwoofer cabinets. Just as some electric guitarists add huge stacks of guitar cabinets mainly for show, some bassists will add immense subwoofer cabinets with 18-inch woofers mainly for show, and the extension subwoofer cabinets will be operated at a lower volume than the main bass cabinets.

Bass guitar players who may use subwoofer cabinets include performers who play with extended range basses that include a low "B" string (about 31&nbsp;Hz), bassists who play in styles where a very powerful sub-bass response is an important part of the sound (e.g. funk, Latin, gospel, R & B, etc.), and/or bass players who perform in stadium-size venues or large outdoor venues. Keyboard players who use subwoofers for on-stage monitoring include [[Hammond organ|electric organ]] players who use bass [[pedal keyboard]]s (which go down to a low "C" which is about 33&nbsp;Hz) and synth bass players who play rumbling sub-bass parts that go as low as 18&nbsp;Hz. Of all of the keyboard instruments that are amplified onstage, synthesizers can produce some of the lowest pitches, because unlike a traditional electric piano or electric organ, which have as their lowest notes a low "A" and a low "C", respectively, a synth does not have a fixed lowest octave. A synth player can add lower octaves to a patch by pressing an "octave down" button, which can produce pitches that are at the limits of human hearing.

Several concert sound subwoofer manufacturers suggest that their subs can be used for bass instrument amplification. Meyer Sound suggests that its 650-R2 Concert Series Subwoofer, a {{convert|14|sqft|adj=on|sp=us}} enclosure with two 18-inch drivers (45&nbsp;cm), can be used for bass instrument amplification.<ref name=650R2 /> While performers who use concert sound subwoofers for onstage monitoring may like the powerful sub-bass sound that they get onstage, sound engineers may find the use of large subwoofers (e.g. two 18-inch drivers (45&nbsp;cm)) for onstage instrument monitoring to be problematic, because it may interfere with the "Front of House" sub-bass sound.