Moving into an apartment with wood joist floors - worried about neighbors hearing

I live in old Victorian tenement 1880 so high 3.6m ceilings and wooden floors - I use isoacoustic feet under my large tannoys - I don’t want to put anything on ceiling as plastered ceiling rose and high elaborate cornice …. But I have 3x rugs layered on top of each other in front of speakers before listening sofa (about 5/6cm) I also have room treatment on side and rear. Even playing loud and sitting barefoot I feel nothing under feet and neighbours are happy. But I’m friendly with them as well so they can message if I’m a bit loud or late …. And I pre warn if I’m having a party 🎉 

It's too bad you don't own the unit to be able to make changes to the floor.  And for the most part not cheap.  I live in a hundred year old space and the floors were changed.  Removing all the wood, then filling the space between the joists with expansion foam where all nooks and crannies are filled especially around radiators if you have them.  Then very thin plywood sheets were glued and screwed (lots of screws) to the joists followed by that pink membrane stuff (forget what it's called) and finally, the floor reinstalled.  In some spots, you may want to add additional screws that could be hidden by a wooden plug that matches the wood floor if necessary.  There is a tool from Dewalt that makes both holes for screw and plug in one shot.  Makes a noticeable change.  I imagine it wouldn't be cheap but considering what you may spend on audio equipment.   

Sorry to say if the speakers produce deep bass there is nothing you can do bass wil penetrate all less dense materials

Therefore rugs and footers can not block bass any and all materialsthat are not extremely dense only bass blocking material is mass loaded vinyl sheeting or cobcrete board with an air gap we know we built a theater for rev runs renovation and we had to sound proof the walls and yoou would need to cover the entire floor to be even remotely effective 

Put the speakers in storage and look for a less bass capable loudspeaker

Dave and Troy

AUDIO INTELLECT NJ

Townshend Seismic Podiums will greatly reduce or even eliminate the sound being transferred to your neighbors below.

Oh man, thanks for the tip!
I have been trying to find a reason for a divorce for a long time, tomorrow I will move my speakers closer to the wall behind which my wife sleeps:)