4 re srx 15's or 2 OA 18's

[DoesDad 10+ year member]

Hey, instead of starting a new thread I figured I would just ask the quick question here. I am ordering 4 obsidian 15's soon and I am not 100% sure which ones I need to get a 2 ohm load. I am pretty sure I need to get the d4's but I'm not 100% sure. I will be powering then with 2 apcl15001d's strapped togeather and need to get a load of 2 ohms in order to get the claimed 3krms out of the amps. Also a link or a pic of a wiring diagram would be greatly appreciated. Thank you.

Google or the search function on here will work as well. There's been quite a few threads on strapping amps for 2 ohm loads (most are only strappable at 2 ohm anyway).