so i made 2 homemade wooden cubes and i placed on my studio monitors (on the desk) . Everything is great except from the low frequencies. I think that the problem exists because the cubes are empty i get something like a small reverb from inside the boxes.
Fortunately i am able to fill them with something to make it more solid ( i didn't close them) SO my question is... what is the best thing-material to put in the wooden cubes so i can hear the sound at its best? maybe a pillow ? tell me what you think thanks.
note that the desk's surface is a glass.( just saying i don't know if it plays any role