How to Wire 3 Subwoofers Correctly Since many people asked about wiring three subwoofers, here’s a quick breakdown to help everyone understand the options. The goal is always to match the amplifier’s safe impedance while getting the best performance. 1. Series Wiring You connect positive to negative across all subs. This increases the total impedance. Good if your amp needs a higher load, but it reduces power output. 2. Parallel Wiring You connect all positives together and all negatives togethe