I have a JL 10 and it runs off a JL 6600/6, so I wanted to add more bass so I bought a mono alpine amp and a 12 rockford to add, is that going to work out for me running 2 different subs, I also run JL 770 and Rockford M282 with JL tweets in rear, so I'll take the 6 channel to a four and run the 10 and 12 of the mono amp

how many speakers do you run? You have a ton of channels that are 2ohn stable.
The subs will be fine on a mono amp.

Its never a good idea to run different size woofers, let alone different brands, they play at different frequencies and will some what cancel each other out, not completely and they may be louder together then what you have now but its far from the ideal setup. I am guessing they are free-air woofers or do they have enclosures? You would be better off using matching equipment, that way you have the same power handling and sound characteristics.

I have the front JL's and tweets and the reat rockford 8 inch 2 ways with a extra set of JL tweets running off the JL 6600/6 and bought the PDX-1.600M ALPINE Marine Mono Amplifier to the 10 JL that I have installed and adding the 12 rockford

order another 10 JL, thanks will return the 12