Does anyone use a RUMBLE filter?

Rumble with bass reflex speakers and wide frequency range amps is pretty common, and I fixed it with a phono preamp that has a rumble filter (Cambridge 640p with a Pangea power supply). Works on pesky amp an speaker taxing sub 20hz crap that I do not care to have around.

Rumble filters, if working properly, will delete the fight scene from West Side Story...a weird side effect.

I have a carefully and properly set up turntable that sounds great, and the only difference between the phono preamp filter being on or off is that when it's on the woofers don't pump with subsonic crap and my tube amp's bias lights don't indicate wild voltage fluctuations. Absolutely zero signal degradation. Prior to this preamp I used a preamp with a built in phono stage and had to use line filters (Nakamichi...amazing little items no longer available) that also showed zero signal degradation. The fix is in!

I do tire of people telling me how my system sounds, but again, since I listen to things and judge signal degradation with my very experienced ears and not the opinions of fatuous psuedo experts, I can say there is nothing to be done with my thoroughly vetted turntable rig other than to replace it, or simply enjoy its glorious sound with filtered rumble and a clear, involving, highly musical result. Note to Raulgasbag...the LEDs on my amp, just like I said, do indicate extraneous rumble in concert with woofer pumping and both are calmed immediately by the well designed 20hz (obviously above the 15 hz bandwidth and 8hz frequency response specs of my amp) filter in the phono pre. Also note that any audio signal never remains "untouchable" unless it's off. Get it? And feel free to refer to a reputable online site for definitions of any English words you can't understand, such as "fatuous", "psuedo", and "gasbag."

I rest my case.