Thank you for your reply! I believe I have my current subs wired in 2 ohms? See the picture below to help me verify?
Pardon my ****** paint skills...
Also, aren't the SWS12d4's 500w RMS? If my MRP-M450 is 220 watts RMS x 1 at 4 ohms (400 watts RMS x 1 at 2 ohms) wouldn't that be...