Editing Subwoofer (section)

====Use in a full-range system====
In professional concert sound system design, subwoofers can be incorporated seamlessly with the main speakers into a stereo or mono full-range system by using an active [[Audio crossover|crossover]]. The audio engineer typically adjusts the frequency point at which lower frequency sounds are routed to the subwoofer speaker(s), and mid-frequency and higher frequency sounds are sent to the full-range speakers. Such a system receives its signal from the main mono or stereo [[mixing console]] mix bus and amplifies all frequencies together in the desired balance. If the main sound system is stereo, the subwoofers can also be in stereo. Otherwise, a mono subwoofer channel can be derived within the crossover from a stereo mix, depending on the crossover make and model. While 2010-era subwoofer cabinet manufacturers suggest placing subwoofers on either side of a stage (as implied by the inclusion of pole cups for the full-range PA cabinets), Dave Purton argues that for club gigs, having two subwoofer cabinets on either side of a stage will lead to gaps in bass coverage in the venue; he states that putting the two subwoofer cabinets together will create a more even, omnidirectional sub-bass tone.<ref name="Purton" />

{| class="wikitable"
|+ PA systems by size and subwoofer approach<ref name="CerwinVegaUnderstanding" />
|-
! PA system set-up
! Venue size
|-
| Small system: Two pole-mounted mid/high frequency PA speaker cabinets and two small subwoofer cabinets with 15- or 18-inch subwoofers (Note: this would be used in club where jazz, acoustic music, country music or soft rock is played)
| Small club with capacity for up to 300 people
|-
| Small high amplifier power system: 2 high amplifier power-rated mid/high frequency PA speakers with 15-inch woofers and a large horn-loaded tweeter; two high amplifier power-rated subwoofer cabinets with one or two 18-inch subwoofer cabs (front-firing, also known as "front loaded", or manifold-loaded subwoofer cabinets)
| Small club with capacity for up to 500 people
|-
| Mid-size PA system: 4 larger multiwoofer mid/high frequency PA speaker cabs (e.g. each with two 15-inch woofers) and four subwoofer cabinets, either front-firing, manifold loaded or a folded horn
| Large clubs with capacity for 500+ people, small music festivals, fairs
|-
| Large-size PA system: Multiple mid/high frequency PA speakers, possibly "flown" up high in rigging, and a number of subwoofer cabinets (either front firing, manifold loaded or folded horn)
| Large venues with capacity for 1000+ people, larger music festivals
|}