Bass traps - foam cushiony items from Amazon ok?

@jumia you won't get a hint as to the sound improvement in your bass by purchasing cheap foam panels. You will gain zero information.

It would be analogous to attempting to find out what someone's voice sounds like from a speaker by using _only_ the tweeter—it would sound like that person was mute.

You must use the proper product to achieve your goal.

@jumia if you want to put together some simple bass traps for cheap, call your local commercial/industrial insulation company and ask for some dense semi-rigid fiberglass panels. Leftovers from a job or whatever. Then cut/stack them together into tall thick cubes or triangular prisms, wrap them in some breathable cloth, and place them in your room corners or wherever you want to experiment.