A set of jumper caps A, B, C and D used to control audio range and reduce distortion in compatible speaker or audio systems. Key benefits - Reduces distortion at low frequencies by using jumper A to limit ultra-low output. - Adjustable distortion control: when Jumper B is on, increasing its capacitor value further reduces distortion. - Range control with jumpers C and D: turning on both caps yields the loudest output, providing a simple way to maximize level within the permissible range. - Clear separation of controls: Jumper A sets the lower limit, Jumper B limits the overall audio range, and Jumpers C and D fine-tune the range for preferred loudness. - Helps prevent speaker distortion at high output by constraining the active range. How it works - Jumper A: limits the lower end of the frequency range to reduce distortion at ultra-low frequencies. - Jumper B: when activated, increasing its capacitance further reduces distortion within the allowed range. - Jumper C and Jumper D: provide range control; with both caps turned on, the system delivers its loudest available output. Important notes - Jumpers A and B control the audio range and distortion behavior: A defines the lower limit, B constrains the overall range. - If the speaker is driven too loudly, distortion can occur even with this control scheme. Specifications and attributes - Function: audio range control and distortion reduction via jumper caps A, B, C, D. - Compatibility: intended for systems that support jumper caps for range control (no specific models listed). - Size: not specified. - Material: not specified. - Performance: enables distortion reduction at low end and adjustable range with the option for maximum loudness when C and D are both on. Use scenarios - Home listening with compact speakers: enable A to limit ultra-low output and B to constrain the range, reducing distortion at higher volumes in a small room. - Studio monitoring: set A for a conservative lower limit and use B to tighten the listening range, helping maintain clean low-end response during mix checks. - Live sound or rehearsal setup: activate C and D to push toward higher output while keeping distortion in check, allowing quick on-site range tuning without changing components. This description preserves the original function and usage of jumpers A, B, C and D while presenting clear benefits, straightforward operation, and practical applications.