BM mkIII install questions

[betrbekepn]

Hi,
New to car audio and have many questions. Been researching but would like confirmation from people who know whats up. I'm going to be installing 2 BM mkIII's into my 09 silverado. Here's a link to the only sub box I could find that will fit GM Regular Cab Subwoofer Boxes Problem is that the BM mkIII requires a 0.5 ft^3 enclosure, the linked sub box has 0.7 ft^3. What I've read here is that stereo intregrity suggest to fiberglass/polyfill your sub box, doesn't this make you sub think it's in a bigger enclosure? So would a 0.7 ft^3 enclosure without fiberglass/polyfill be equal to a 0.5 ft^3 enclosure with fiberglass/polyfill? Also the BM mkIII sub displaces 0.05 ft^3 inside the enclosure, is this included in stereo integrity's 0.5 ft^3 recommendation? I have many more questions but I'll ask them one at a time. Thank You All!

[Electrodynamic]

If you don't use fiberglass insulation or polyfill the subwoofer will not have a smooth response as enclosure resonances will not be tamed.

The rule with stuffing an enclosure is that doing so can add roughly 25% more volume. So if you're enclosure volume is 0.5 ft^3 and you stuff it, the subwoofer will think it's in 0.62 ft^3 (it will play a little bit lower), but the airspring inside the enclosure will still be equal to the 0.5 ft^3 enclosure so the power handling will still be 450 watts. Your 0.7 ft^3 enclosure will still be 0.7 ft^3 to the subwoofer, which lowers your power handling down to 400 watts.

The subwoofers physical displacement of 0.05 ft^3 is so minimal you don't need to worry about making sure your enclosure is 0.05 ft^3 larger than the target volume. The low end extension and power handling are not effected significantly by placing the subwoofer inside the enclosure.

[slade1274]

Bottom line.... it will perform better in the recommended volume, so block the inside of the enclosure to take up the extra volume.