If your Rockford is an older model, I would stick with it.

Here is why I say if it is an older amp stick with it. One of these old Autotek's rated at 99 watts runs three Rockford 12" subs and they pound. And the amps are almost 20 years old.

I like old... I, running an ancient hifonics zues with the gain turned way down because Im afraid Im going to blow the mtx speakers out of the boat. And it still hits like the hand of an angry god.

And kills batteries like theres no tomorrow.

actually its not as bad as I thought it was going to be....

They will only kill betteries if the amp has an un-regulated power supply. Most older Orion and Soundstream amps had an un-regulated power supply.

I don't care what they say, it takes power to make power. Amps kill batteries to make serious sound. But watt for watt an old amp "may" use 10% more power if you are running full tilt.