Subwoofer rumble issue

Surely you must believe most other people are as backward and incapable of real progress as you. I’m considering putting you on the payroll nevertheless in view of your excellent job of getting the word out. 

LOL you guys are funny. There’s gotta be a solution that doesn’t involve moving my tt to another room. Would a different tone arm help? One that doesn’t use magnetic stabilizing? Ugh this is no fun. So strange that it developed over time too. I’ve had this set up for about a year now and it just started a month ago. I did have woofer pumping issues with my mains at first but fixed it by putting them on stands vs. the same surface at the tt. Do you think going to the Herron phono pre will help at all? 

Back in the TT days Paul you had speakers that were lucky to go below -3db@50hz, now there’s subs that can go 2 octaves lower, with 1000w plate amps, this is what I found with Linn LP12/Ittok/Supex1000 and my Kef B1814’s 19hz, then CD came along, and then no problems.

Cheers George

Well I’m not going to CD

No not telling you to, would never do that Paul, but beside putting the TT in another room, it was the only other fix for me with bass that goes to very low frequencies.

Just dawn on me, if you have any tubes in the chain, these can go "microphonic" some call it "euphonic" (w**k w**k) and this can cause runway bass oscillation also.
If you have then do the finger nail light tap test on these just like the plinth test, but without the stylus on the record this time.

Cheers George