that means the are svc not d1, d1 means they are dual 1 ohm (which means you have two pairs of 1 ohm terminals), they are both 4 ohm subs that you should wire in parallel to make 2 ohms and you need an amp that does around 400 or more rms at 2 ohms, which my focal solid red 1, and im sure alot of other amps would be great for.