If you know what you’re doing, many of the best speakers can be configured so that you can connect multiple speakers to each channel in your amplifier. Below, we’ll show you how to connect four speakers to a 2-channel amplifier.
And for similar resources regarding wireless equipment, you can read up on our articles that catalog the loudest Bluetooth speakers and how to connect Bluetooth speakers.
Connecting speakers can be done in various ways. The two most common setups are speakers in a series or a parallel setup. Below, we’ll show you how to connect speakers in a series so you can achieve the best possible sound quality.
Remember to double and triple-check the total speaker/amplifier impedance levels before connecting any wires.
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The first step when wiring speakers to a multi-channel amp is to ensure that the impedance levels match. To calculate the impedance of speakers in series, add the overall impedance of each speaker. For example, if you have four 8-Ohm speakers, the total impedance will be 32 Ohms. Your amplifier should be rated to handle this many Ohms. The impedance rating for the amplifier and the speakers should be listed in their respective manuals or on their labels.
If the total speaker impedance falls within the impedance rating of the amplifier, then take the positive wire from the amplifier and screw it into the positive terminal of the first speaker.
Connect a speaker wire from the first speaker’s negative terminal to the second speaker’s positive terminal. Then, do the same from the second speaker to the third speaker and the third speaker to the fourth speaker.
Never connect speakers with a total impedance lower than the amps since it can damage the amp.
Then, connect a wire from the fourth speaker’s negative terminal back to the negative terminal of the stereo amplifier.
Test the speaker setup at different volume levels and ensure that all the connections are secure and working correctly.
STAT: The majority of stereo speakers will have an impedance rating between 4 and 8 Ohms. (source)