12/20/2023 0 Comments Turntable rumble subsonic filter![]() ![]() ![]() ![]() Therefore, below 140Hz, the music is in phase in the lateral stylus motion, and only out of phase noise is found in the vertical stylus motion. When the stereo stylus moves vertically, the two signals produced are equal and 180 degrees out of phase. This is done to avoid large out of phase groove excursions.Ģ. When records are made, frequencies below about 150Hz are combined to mono. The power amp breathes easier and the woofers can concentrate on the music at hand.ġ. And with todays cross over video and music entertainment systems, response down to 10 Hz is common.Ī good rumble filter will actually improve the bass response by removing those deep subsonic dynamic swings from the system altogether. Often part of the recording itself, even the best turntable will reproduce it. One of the biggest let downs with phono playback is subsonic rumble. Yet the need for these special devices is growing. You simply do not see the rumble filters being offered anymore. The really great features to take note of with the RF-1 are, I believe, the product uniqueness. This suppresses vertical rumble and the "wump" "wump" of warps.Īll steel construction wards off the effects of stray magnetic fields. Unique active vertical cancellation circuit "monos" the low frequencies below 140 Hz. Yet the sonic advantages of doing these things is unquestionable. Maybe it's the costly marketing, I don't know, but it really is not all that expensive to include hi quality parts like Wima propylene capacitors and gold/teflon RCA's. It is happy to remain powered up at all times. Place it in between the phono preamp and control amp or in a process loop. You probably can't hear it, but your car woofers are going mad with all that subsonic rumble! The RF-1 is a must for vinyl enthusiasts, live DJ's and when burning CD's for the car. Your subwoofers will thank you! Suppresses acoustic feedback too. The KAB Great Sound Escort RF-1 is a very fine transparent rumble filter that not only suppresses very low frequency (subsonic) energy, but also uses a unique active cancellation circuit that effectively suppresses vertical rumble too. If you can see this motion, the RF-1 will solve your feedback problem.Īnd with rumble eliminated, the soundstage becomes more "still" and the bass actually tightens up because the woofers are no longer modulating and the power amp is no longer wasting current resources on sub audible noise. If you cannot see this motion, the RF-1 will not solve your feedback problem. This produces a slow easily visible in and out motion of your woofers. But the main source is feedback exciting the natural stylus/arm resonance between 7 and 12 hz. Much of it is actually cut into the record groove when the master disc was made. Getting into LP's and startled at the big speaker cone movements that you're seeing? Thinking a better turntable will help? It may not! This very low frequency energy is called rumble. Record Cleaning Machines and Accessories. ![]()
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