Low Frequency Rumble from TT between songs

Rumble is different than acoustic feedback. Rumble is noise from the turntable usually related to the bearing and can indicate a lack of sufficient lubrication or an issue with a worn bearing. Acoustic feedback is caused by bass energy being transmitted to the turntable system which results in a roar that builds upon itself getting louder and louder until you lower the volume. Acoustic feedback can be addressed by better isolation for the table like a wall shelf usually provides. What you're describing sounds like rumble, but if it's only on certain records it can be in the recording or on a worn record. The Harbeths may not have reproduced such low frequency info like your larger speakers do which made the rumble audible. Check the platter bearing of your table for proper lubrication or any abnormal play or wobble, and if it's belt drive also check the motor bearing.

Yeah, it  wouldn't be rumble. Acoustic feedback. But the table's been in the system for a couple years but the speakers have been here for 3 months and the noise only started a few weeks ago. Driving me nuts trying to figure it out. 

@dhcod , acoustic feedback occurs at a specific frequency and is a steady tone typically described as a howl. 

Rumble is very low frequency and lumpy for lack of a better term. It is low frequency garbage for either the bearing of your turntable or the bearing of the lathe that cut the Lacquer your record was produced from. If it is your turntable it will be consistent and occur with every record. If it only occurs with some records and not others the fault lies with the manufacturer of the record. 

You hear it now because your new speakers are capable of reproducing those very low frequencies. Rumble is one of the banes of vinyl reproduction like scratches, ticks and pops.

It's definitely different on every record but still there on everything. 

I tried moving the speakers away from the table and that for sure lessens the sound. It's clearly an interaction between the two components. The bad part is we live in a small place and the speakers can't be moved and neither can the turntable. 

Are some turntable less susceptible to this interaction. I'm using a VPI Aries 1. What type of table should I try? Suspended? Idler? Or is the cartridge picking up the sound so it doesn't matter?

Have you considered a dac?