How to increase subwoofer bass, Tips to use free chokes for better bass boost for speakers

How to increase the bass for a subwoofer that is completely free For a better bass boost, and high bass, the trick is simply to use the iron core chokes I found researching. The inductance value will be increased not less than a silicon core I have calculated to have a frequency divider for the initial speaker. Used for any woofer and amplifier. Power from 500w up to 8000w Channel: Alfred Google+: https://plus.google.com/u/0/101341691653861442619 facebook: https://www.facebook.com/thanhhai.bui.58910