This jumper cap kit lets you precisely tune bass depth and height range by configuring jumpers A, B, C and D. It helps reduce distortion while dialing in your preferred sound profile. Key benefits - Precise bass control: Use jumpers A and B to define the bass range limits, improving clarity and reducing distortion where needed. - Adjustable height range: Jumpers C and D control the height (treble) range for a louder or softer high end. - Simple adjustments: Cap positions directly influence the audio output, enabling quick customization without complex processing. - Clear, practical tuning: Maintains sound integrity by enabling targeted adjustments rather than broad, flat EQ changes. How it works - Bass range - Jumper A controls the lower limit; Jumper B controls the upper limit of the bass area. - Removing the cap on Jumper A limits super-deep bass and reduces distortion. - Removing the cap on Jumper B increases the effect, while having Jumper B cap on reduces the effect. - Height range - Jumper C and Jumper D control the height range. - When the caps on Jumper C and Jumper D are on, the heights are the loudest. Important note - In some speaker configurations, certain jumper settings may cause distortion if enabled in an incompatible way. Start with conservative settings and adjust gradually to suit your system. Use scenarios - Small living room stereo: Remove A cap to prevent overly deep bass, then tune B, C, and D to achieve clean, balanced sound without distortion. - Home theater setup: Fine-tune bass depth and height for movies to avoid overpowering low-end or harsh highs while preserving dialogue clarity. - Outdoor or patio speakers: Enhance or tame high-end brightness by adjusting height range with C and D, while keeping bass within a comfortable, distortion-free level. Compatible with standard jumper configurations A, B, C and D to tailor your audio performance.