Matching the impedance of your speakers to the impedance of your amp is extremely important. An impedance mismatch can quickly damage an amplifier. These instructions cover wiring combo amps, extension cabs, and series/parallel wiring options. DOWNLOAD PDF Download Pre-Wired Speaker Harness Instructions 1.81MB View instructions with Adobe Acrobat Reader 4.0 or higher. Download Adobe Acrobat free from Adobe.