Bass traps - foam cushiony items from Amazon ok?


I see foam style bass traps for about $25 that seem workable.  Maybe buy two just to test experience.  Are these good to buy?

and maybe than i can buy more pricier panels.  
jumia
@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.
But gik has a 3 month wait to produce your order. I asked.

they do seem to know alot about accoustics.  Tough job.
Three month wait? I understand, we all get impatient. But the payoff at the end will be far greater than slapping up a few foam panels.
http://arqen.com/store/vicoustic-vari-bass-helmholtz-resonator/

These work very well..

Checking on a deal right now, I need 8, total of 4 boxes..

I'm thinking a little more Art Deco on the patina.. Touch of Queen Ann, in other words cock that crown to one side.. Just like the Yanks.. :-)