Can I use an isolation stand with an isolation pad?

Here is a possibly dumb solution:

How about suspending the subwoofer from the ceiling?

Before you laugh, when I was in college our dorm (barracks) had very bouncy wooden floors. Even my roommates B&O turntable with its own internal suspension would skip when someone stomped or jumped even in the room next door. So we used cotton webbing straps and suspended it from the ceiling. It worked great Of course we had to stabilize it with a horizontal strap since it tended to sway from the motor momentum.

That's why I found a condo on 1st floor which is 3 ft concerte roof of underground garage .

Here is a possibly dumb solution:

How about suspending the subwoofer from the ceiling?

Before you laugh, when I was in college our dorm (barracks) had very bouncy wooden floors. Even my roommates B&O turntable with its own internal suspension would skip when someone stomped or jumped even in the room next door. So we used cotton webbing straps and suspended it from the ceiling. It worked great Of course we had to stabilize it with a horizontal strap since it tended to sway from the motor momentum.
hahah thankyou so much
VidMate AnyDesk mobdro.onl/

In the end 20hz tone is 56.5 ft long so your neighbour will almost always hear the bass louder then you. even a 40hz tone is 28ft long so bass is always a hard thing to tame in smaller spaces. I've seen an issues were my friend had no bass in his apartments but his neighbour down the hall was booming really loud. Bass traps may help but probably not much for your neighbours. turn it down is really the only thing you can do other then what you have already done...not ideal to be that close to neighbours and love audio-movies I feel your pain I'm in a similar situation.

Springs, my friend. Especially for subwoofers as they produce very low frequencies, unlike your average full range speaker.