Thicker foam will just be reflective and do little to increase the percieved volume of the box. You want something like Acoustafill. I find that a mixture of industrial felt, or opencell polyurathane foam, and acoustafill works best. However I will say, the magnitude of the effect is debated, so you may still not get the results you want.
Closed cell won't absorb much water and open cell is a sponge.
Consider using basalt based insulation often referred to as rock wool. I think for adding virtual volume, this would be a good choice.
The test I like to use is to hold up a tweeter or midrange on the far side and try and listen through it. Rock wool seems to do an excellent job. The better it works at high frequencies, the better it will likely do at lower, IMHO.
At some point, it has no effect.
Consider using basalt based insulation often referred to as rock wool. I think for adding virtual volume, this would be a good choice.
The test I like to use is to hold up a tweeter or midrange on the far side and try and listen through it. Rock wool seems to do an excellent job. The better it works at high frequencies, the better it will likely do at lower, IMHO.
At some point, it has no effect.
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