Wich is better? should i use the egg shell shaped sound insulation or pollyfill for inside my subwoofer box?

Question

egg shell insulation is same found in sound recording studios or pollyfill wich will give me best base sound cheers

Answer 1

I have been building enclosures for about 16 years now and have always used polyfill.  Also make sure you are using good wood for your enclosure.  I would recommend no less than .5 inch MDF.  I would use .75 inch MDF if you can.