Also a note about gain: it is not a volume knob. Please set it correctly or you could damage your equipment by sending a clipped signal to it. Here's an informative video on how to do it. Also, never use any bass boost type dial either.

Thank you, I am a great example of having just enough knowledge to fuck something up. After adjusting the gain I thought some things didn't sound right. Nothing was clipping, I am familiar with that, just didn't sound as good as when I hooked it up initially.

Allow me to be ignorant a bit longer. The 12 Inch ver of the sub you linked is 300 watt RMS, and so is this 12 inch Rockville. I know you get what you pay for, usually. How much of a real world difference, based on the numbers on paper, how different are these?