There are a number of brands of expanding foam bags that will… well, create foam and conform around whatever you are packing. You would want large ones. Amazon has a number of them. I would search google to find the right size.
Source For Styrofoam Packing Inserts
Hi Folks-
I'm looking for replacement styrofoam speaker packing for my PSB speakers (originals were tossed out due to roof leak). Tried the manufacturer but all they could send me was the boxes. Anyone have any suggestions on where to find OEM packing before I go to the trouble of making my own?
Thanks