Subwoofer Wiring Diagrams — How to Wire Your Subs For wiring subwoofers, we recommend using wires of 12- to 16-gauge in size. [Shop for speaker wire] Start building your bass system today. Now that you've seen how to wire subwoofers and amplifiers together, you can knowledgeably shop Crutchfield's extensive selection of subwoofers and amplifiers. Subwoofer Wiring Diagrams | Sonic Electronix Sep 29, 2014A proper subwoofer installation means that the power requirements between the amp and sub match, the impedance between the sub and amp are consistent, and the subwoofer is mounted in the correct box. Using a subwoofer wiring diagram will ensure that the impedance between the subwoofer and amplifier match.