400W 2-Way Passive Crossover Board

Physical specs: 7 cm length × 5 cm width × 2.5 cm height. Approximate weight: 85 g (±3 g). Max input power: 400W. Compatible with speaker impedances from 4 to 16 ohms. Circuit board colour: red. Housing material: ABS plastic with embedded metal terminals for stable connections and heat dissipation. Bass range is controlled using jumpers A and B: jumper A defines the lowest frequency passed to the woofer — removing its cap rolls off extreme sub-bass to prevent mechanical overload and distortion. Jumper B adjusts the upper bass boundary — its presence reduces bass output, while removal extends it upward. Treble range is shaped using jumpers C and D: both caps engaged yields strongest high-frequency output; only C engaged softens highs moderately; only D engaged further attenuates them; both removed cuts treble entirely. These four independent adjustments allow systematic voicing of the speaker system. Installation requires connecting amplifier output to 'IN', woofer to 'LOW', and tweeter to 'TREBLE' — ensure all joints are tight and enclosure is airtight before testing. Begin tuning with jumper A installed and B unpopulated. Then evaluate treble balance using C/D combinations — e.g., A+D prioritises bass impact, A+C delivers articulate mids and highs, AB+CD shifts emphasis toward vocal and instrumental clarity. Final setting depends on driver characteristics and room response.