How to Make a Fiberglass Subwoofer Box

Step 18 18. Volume Check

Using the packing peanut method once again, check the volume again. Hopefully your box is larger than the recommended size, if not the recommended size exactly. If it is too small, I don't know what to tell you other than live with it, or start over. For those of you with boxes larger than recommended (which I hope is most of you), all you need to do is add some Polyfill to your cracks and weird sides of the box to lower volume.

Comments

[SAijl]

Polyfil makes your box appear to be larger to your sub. It will help your sub if your box is too small.

[Vinsu]

True. With fluffy fillings one can make the speaker "think" that the enclosure/box is bigger than it really is, virtually increasing the echoroom (not sure if proper word). In ported boxes it is more important to have a properly measured enclosure than in enclosed ones (those without ports) but it doesn't hurt to try different setups.

[Hycro]

I always use "Buffalo Snow" (aka polyfil) in my sub boxes, gives 'em a "warmer" sound, and don't sound so hollow, especially for ported boxes.

[darkprinceb13]

true poly fill (aka Pillow stuffing) does work to bring the sound out of a sub thats in to small of a box. also try filling the bottom with sand to lower a subs impact note. It makes for a much deeper thump. Great post and keep building.