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Low Frequency Rumble from TT between songs

I'm sure it's in the songs too but I'm getting low frequency rumble now that I've switched from Harbeth 30.1s to some large base reflex studio monitors. Between songs and on the lead out groove I'm getting a rumble at mid to high volume. Is that an isolation issue or something else. Table on a wall shelf, about six feet from the BACK of the left speaker, so I'm not understanding why this would happen.

dhcod
juanmanuelfangioii
958 posts
 

SPL Phono Pre will eliminate this. 

vonhelmholtz
911 posts
 

SPL sure builds beautiful components. I would think that engaging a notch filter would change the sound presentation. If not, why wouldn’t all companies have full time rumble filters?  This would make turntable design a bit more relaxed.

dhcod OP
706 posts
 

Just to follow up in case anyone is interested. The low frequency rumble is being picked up by the SET amp I'm using. It's in a weird bass trap spot. It goes away when I swap amps to SS. I'm plugging in a subsonic filter tomorrow to see if that helps and if there's a sound penalty. 

lewm
12,600 posts
 

Some tube or tubes in your SE amplifier is/are microphonic. Tube damper(s) might help to reduce the magnitude of the  noise to tolerable levels.

dhcod OP
706 posts
 

I had the same thought about microphonic tubes but I swapped in a whole new tube set and no change. I should borrow another tube amp just to test that as well although I'm pretty excited about the First Watt SIT-3 I just bought.

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