A wideners are used to shape the bass range. A sets the lower limit and B the upper limit of the bass. On some speakers, bass that is too deep can cause distortion. This device helps prevent that while giving you precise control. How it works - A jumper: remove the cap to limit ultra-deep bass and reduce distortion. - B jumper: remove the cap to increase bass; activate the cap to reduce bass. - C and D jumpers: control the high frequency range. When the caps of C and D jumpers are activated, the highs are strongest. Key benefits - Reduces distortion from overly deep bass - Enables precise adjustment of bass depth and range - Increases high-end presence when desired via C/D caps - Cap-based adjustments offer quick, straightforward tuning Compatibility and performance - Designed for systems that use A, B, C, and D jumpers - Suitable for speakers that can exhibit bass distortion at high levels - Improves overall signal clarity by allowing targeted bass and treble tuning Use scenarios - Home stereo with bass-heavy tracks: remove A cap to prevent distortion from ultra-deep bass - Bookshelf or small-room speakers: adjust bass by removing or activating the B cap to suit the room and music - Live DJ or monitoring setup: activate C and D caps to maximize highs for clearer top end while keeping bass controlled