Does anyone use a RUMBLE filter?

Dear Wolf_garcia: +++++ " Absolutely zero signal degradation... " +++++

no, I don't think so. The important subject here is that even with your: """ carefully and properly set up turntable """"
do you know from where in your system comes that " subsonic crap " that you experienced in your system? because if it's coming from your electronics then that " subsonic crap " is only part of the signal degradation because exist other " things " ( I can't find other word, my english language is very limited. ) generated down there that still affect the signal. In the other side your " tube bias " light's can't help because your unit has a bandwindt that starts at 15 hz that we can't assume as a subsonic one.

My take in this thread is not really about filters but to fix the problem from its origin. This is the only way to preserve ( in that regards. ) the audio signal integrity and the only way that that audio signal stay UNTOUCHABLE by anything.

Got it?

Regards and enjoy the music,
R.

Is a 20hz in line 12 db per octave high pass crossover the same as a subsonic filter?

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."

Well, most of the problem comes from from the motocross profile of a record (I am not talking about the music in the groove) with per revolution warps and cross section undulations that cause the < 33.3 Hz rumble, and there is nothing that can be done to fix this in system optimization other than to avoid playing (most) records altogether. In my experience that is where almost all the pumping is coming from. Just watch a record spin with backlighting and you can see these inch-to-couple-of inches-wide undulations. That is where the rumble comes from.

Dear Wolf_garcia: +++++ " My take in this thread is not really about filters but to fix the problem from its origin. " ++++

that's what I posted. You don't care to fix it then continue to enjoy your " asprin ", nothing wrong with that because is you whom have to be satisfied: not me.

My opinion is only that the important opinion is yours because you are the one that must to live with the " asprin ".

Regards and enjoy the music,
R.