Help with sound suppression

Double basses tend to rumble buildings, either by direct connection like your endpin, or by sound waves. You can mute your bass, or try to pad the end pin, but a double bass just moves too much air to try to suppress it and it's still going to rumble especially on an upper floor of a wooden structure. A concrete structure will be better, but floors and especially walls will still rumble.

You might consider an EUB, with which you can use an earphone for practice.

 

Drop in and say hi. Let them know you’re a Pro Musician. Ask them what times the noise will bother them, and which rooms to practise in at which times.
eg. Avoid above bedroom after 9pm, avoid above TV room 7-9pm.

A few inches of foam padding with a piece of wood on top will decouple the end pin from the floor.

 

EUB=electric upright bass. Some of these are affectionately known as stick basses, which produce very little if any acoustic sound.

Padding material you may already have sitting around -- a stack of old magazines in a cardboard box (to keep them stacked).

 

Practice at reasonable times, like between 10AM and 9PM, and if no one complains, you're good.