Are cardboard sub enclosures any good for home theater? I'm new to DIY speakers but a cardboard enclosure seems so simple to build that I'm willing to do the job but I need some tips despite that. I need help to build an enclosure for the Dayton Audio RSS210HF-4. The specs suggest a 1.76 ft3 enclosure and I can get that volume from a 10 inch diameter, 48 inch long cardboard tube or close. I got that number from the volume calculator available in this website. I used a thickness of .25 inch because I don't know the real thickness of the tube but that number seems pretty close to me. I need help with that as well. Is there any member with experience in such project that can give me some tips?