iFi Audio Phono 3 Desktop Turntable Phono Stage Intelligent Subsonic FilterZEN Phono 3 For record lovers, new and old. The ZEN Phono 3 redefines what your turntable can do. Its intelligent subsonic filter corrects warped LPs, while an ultra quiet noise floor and adaptable loading options unlock a new level of clarity from your cartridge. Super Smart. Super Subsonic. Standard subsonic filters arent intelligent and are typically loathed by audiophiles. They filter not only the bass rumble from warped records but also the bass