Amplifier Speaker Wiring Modes - Stereo, Mono & 3-Channel Crossover Diagram

This document is a page from a car audio amplifier instruction manual explaining how to connect speaker wires in different output modes. It covers four configurations: two-channel mode (stereo, with left and right speakers), one-channel mode (mono, with a single speaker), three-channel mode two-way system (mid-high right, woofer mono, mid-high left), and three-channel mode three-way system (high/mid-high left and right, mid/mid-bass left and right, and a woofer/subwoofer mono channel). The three-channel setups are achieved by combining stereo and mono modes on a bridgeable two-channel/one-channel amplifier using passive crossover components: inductors (L1, L2) act as low-pass filters for the woofer/subwoofer, while capacitors (C1, C2) act as high-pass filters for the high/mid-high drivers. The page warns not to connect both RCA input and speaker input simultaneously, and notes that when bridging, the amplifier sees only half the original speaker impedance, so speakers rated 4 ohms or higher must be used to avoid damaging the amplifier. It also advises securing or soldering inductors and capacitors to the speaker wires and using tape or heat shrink to prevent short circuits. Diagrams illustrate each wiring configuration. Useful for anyone building a homemade passive crossover for a bridged amplifier installation.