i purchased some diamond audio m6 12's but they were out of 4 ohm speakers so they sold me 2 ohm speakers. basically i've been running my class d amp at 2 ohms and pushing only around 750 rms. today, about 2 months later, i finally got my 4 ohm subs and got it all wired up. at 1 ohm the amp i have, a memphis m-class 1000d, pushes around 1200 watts rms. im just hapy to finally have the right subs.