If both subs are 4 ohms and you wire them in series, the total will be 8 ohms. If you feed this 8 ohms with 500W * 4 ohms, you'll get something like 250 * 8 ohms for both subs that in fact will work as a single unit of 8 ohms
Joey
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Posted on
Wire them in series parallel and you will have a 4ohm load. Then it will be 250 watts to each.