If you like crisp 'hard slamming bass, use only stapled on the inner sides. If you want a smoother sound, with a better sounding midrange, fill it up loosely.
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Well after much experimentation, I now know what Jim Lansing had in mind for me and apparently this particular incarnation of his classic LE15A driver. I have tried filling the entire cabinet with with fairly tightly packed Accoustistuff, then covering all sides and about 50% of the rest of the empty space with the loosely cotton like material, and finally taking it all out and just leaving the original insulation, just like God and Mr Lansing intended and just replacing the areas that have become bare over the years and all other exposed wood with the accoustistuff and leaving the rest of the enclosure open for all that bass to wander around freely in. I placed a pristine copy of Miles and MJQ on my turntable and was literally blown away. I now remember what made me fall in love with these vintage beauties in the first place. They are staying just as they are now and the next time I decide to screw with nature, I hope someone comes over and slaps me across the voice coil.