I'm not sure why more people have not purchased this amplifier. I have this powering 4 Infinity Kappa 682.11cf. I used to have it powering a single 12's 400 watt sub as well, but I upgraded to two and needed more power. The power and clarity this amp provides is astonishing. The built in adjustable crossover frequency point is a fantastic tool if you know how to use it correctly. The C.L.E.A.N set up makes sure you properly set your gains to match your head unit. It's like having a SMD DD1 built into the amp! This amplifier is highly underrated as well. The birthsheet stated that it is actually producing 1399 watts. 400 watts OVER what it claims! Awesome job, Rockford!
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