If you have an amplifier that is not 1ohm stable, use “series/parallel” to wire your subwoofers.
If you have two Dual 2ohm subwoofers, Series/Parallel will have a final impedance of 2ohms.
If you have Two Dual 4ohm subwoofers, using this method will give you a final impedance of 4ohms. Which is not the best, it’s better to get a new amp that is 1ohm stable so you can wire your 2 D4 subs in parallel to 1ohm.
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