- 1). Check your amplifier's documentation for bridging capability. Note the maximum amount of impedance load the amplifier can handle.
- 2). Check the impedance of the individual subwoofers. The documentation that came with the subwoofer will have these impedance values.
- 3). Determine the correct impedance load the amplifier will have with the subwoofers connected. Divide the individual speaker impedance value by the number of speakers wired in parallel to arrive at the correct value.
- 4). Purchase or gather the correct gauge speaker wiring for the subwoofers. Depending upon the amplifier and speaker terminal types, you may need to purchase corresponding end connectors to ensure tight and secure connections from the amplifier to the speakers.
- 5). Use a pair of wire cutters to cut the speaker wire to the desired length. If necessary, crimp on the end connectors purchased to the speaker wire using the wire cutters.
- 6). Wire the subwoofers in parallel by connecting together the positive terminal of one subwoofer to the other's positive terminal and the negative terminal of one to the other's negative terminal. Connect a single pair of wires to one of the subwoofers. These positive and negative wires will connect directly to the amplifier.
- 7). Read the documentation of the amplifier to determine which speaker wire terminals will correctly bridge the amplifier. Because not all amplifiers share the same design in regards to the terminals used for bridging, one particular amplifier will require use of the left-channel positive terminal and the right-channel negative terminal; other amplifiers require amplifier connections to the right-channel positive and left-channel negative terminals.
- 8). Connect the positive speaker wire leading from the subwoofer(s) to the appropriate right- or left-channel positive terminal of the amplifier. Connect the negative speaker wire leading from the subwoofer(s) to the correct right- or left-channel negative terminal to complete the bridging process.
- 9). Check all the speaker terminal connections for looseness and tighten as necessary. After all the wiring is checked, test the audio system for proper operation, adjust the amplifier crossover and signal boost controls according to manufacturer instructions.
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