Why do my bass drivers shake violently listening to vinyl

Two questions for arrowhead: (1) By what mechanism do you think a phono pre or a pair of ICs can cause rumble (except in the case where the phono stage has very low bass frequency extension, enabling it to transmit rumble frequencies to the downstream components, but that's where the rumble or subsonic filter works)? And (2) why do you focus on the tonearm and not mention the platter bearing as a source of rumble?  I do agree it's a nice idea to take the TT to another system and determine whether rumble follows along with it.  I had suggested inserting a known good TT into the OP's system, for the same reason.

As a MAGICO owner never had this problem.

I purchased the KAB rumble filter. As soon as it comes in I will post my findings. Thanks all for the enlightening discussion. 

lewm:
I don't know by what mechanism a phono pre or IC's can cause rumble problems the electronic wizards can give you dozens of explanations sometimes they can even find the reason for the problems other times it is all a mystery to them. All I can tell you is this, we have seen some weird and unexplainable things in the years we have been in audio. Once a manufacturer claimed it was a cracked IC board that caused the rumble problem. We have seen phono preamps and IC's that could pickup CB, airline and police broadcasts, electronic noise from passing vehicles and just recently we had one that was able to pickup noise from a flying drone, so picking up noises that can cause rumble is not out of the question. My job is to find the problems and fix them not explain why they happened. I can tell you from experience there have been times when replacing a phono pre or IC's  solved a rumble problem. You are correct about considering a platter bearing as a source of a rumble problem many times it is, my bad for not mentioning it. I mentioned the Technics tonearm because we have had so many problems and compatibility issues with them in the past.