When speakers are connected in parallel, the impedance is reduced. The impedance change with a parallel speaker connection is only slightly more complicated than the series connection. If there were three 4 ohm speakers in series, the total impedance will be 12 ohms. In a series connection, you simply add the individual impedances. If both of the speakers have an impedance of 4 ohms, the total impedance will be 8 ohms. Lastly connect the negative terminal of speaker 'B' to the negative terminal of the amplifier. Then you connect the negative terminal of speaker 'A' to the positive terminal of speaker 'B'. In a series connection you simply connect the positive terminal of speaker 'A' to positive terminal of the amplifier. This page will explain how the impedance changes when speakers are connected in series. We described series speaker connections on a previous page. The amp won't produce full power and the system won't produce as much SPL as it would with the correct load but it's also going to allow the amp to operate safely and reliably. The better option is to connect the speakers to present a lighter_than_minimum load. This would get more power from the amp but it's also likely to cost the owner $200+ to repair the amp. The speakers could be connected to present a load that is unsafe (for example, a 1 ohm load for an amp only capable of driving 2 ohms minimum). In those instances, there will be two choices. There will be some speaker/amplifier combinations that will not allow full power to be produced safely. Most people want to connect their speakers in the lowest possible safe load to get the most power from their amplifiers. This page is for those who don't fully understand how to connect their speakers to their amplifiers to present a safe load to the amplifier. Series, Parallel and Series/Parallel Resistance
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