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LP Rumble Filter and LV Phono Preamp
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Turntable Rumble Filter under Audio Filters Circuits -14079- : Next.gr
KAB RF1 Rumble Filter - Analogue Seduction
Suggestions for a transparent-sounding subsonic filter. | Steve Hoffman Music Forums
KAB RF1 Hi Quality Rumble, Subsonic Filter Photo #1863317 - Aussie Audio Mart