My box simulation Measurements: Subwoofer final design with Hypex FA 501, no filters It seems like this subwoofer has no limits in the low end bass. Let’s check the final result: Speaker nearfield + Bass Reflex nearfield with low pass filter LR4 65Hz set on Hypex It shows -3dB from 13Hz (32Hz phase shift) RED … Continue reading Subwoofer Fat Boy