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3 years ago
Adding an extra pair of speakers will make the amplifier work much harder. Many amps are capable of doing so, but you should be sure before you try.You will need to know the impedance of your speakers, and the minimum drive impedance of the amplifier. It's really likely your speakers are typical 8 ohm nominal impedance, so you're loading your amp with 8 ohms per channel. Adding an additional pair will cut that impedance in half, making the amp work into 4 ohms per channel. Check the amplifier specifications, if it references power into 4 ohms, 4 ohm minimum load, or something similar, you will be fine. If it doesn't, you're asking for an overheat and possibly an amp failure.
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