[Electrodynamic]

Our web guy is out of commission for a few weeks, so until he gets better here is the BM FAQ:

What is the mounting depth if mounted on a normal ¾” piece of material?

When mounted to a ¾” piece of MDF or other material the mounting depth of the BM mkIII is 2.75”.


What size enclosure can I put the BM mkIII in?

For optimum performance the enclosure volume can anywhere between 0.42 ft^3 and 0.55 ft^3 sealed. We highly recommend stuffing any sealed subwoofer enclosure with polyfill and/or fiberglass insulation.


Can I put the BM mkIII in a smaller enclosure or a larger enclosure?

Yes you can. However, power handling and/or low frequency extension will be affected. The BM mkIII has been engineered to provide optimum performance in 0.5 ft^3 sealed. Making the enclosure volume significantly smaller than recommended will cause a reduction in low frequency extension. On the other side, making the enclosure volume larger will significantly reduce the power handling of the driver.
If you make the enclosure smaller than recommended (0.5 ft^3 sealed), we highly suggest using an aperiodic membrane such as a ScanSpeak Variovent.
Making the enclosure larger will diminish power handling as follows: In 0.75 ft^3 power handling is reduced to 400 watts RMS. In 1 ft^3 the power handling is reduced to 300 watts RMS.


How much room does the BM mkIII take up inside the enclosure?

The BM mkIII 12” subwoofer displaces 0.05 ft^3.


How much room do I need behind the subwoofer?

If you have no other choice, you can put the back of the BM mkIII 1/8” away from the back of your enclosure. Ideally there should be ¼” to ½” of space behind the BM mkIII.


Does the BM mkIII need 450 watts RMS to perform?

Absolutely not. The new BM mkIII is a very efficient subwoofer thanks in part to its XBL^2 enabled motor and it does not need every bit of its power handling limit in order to perform well. In its recommended enclosure volume of 0.5^3 sealed, the BM mkIII’s ideal power range is 200 to 450 watts RMS.