2 dual 4's can't run at 2ohms
1ohm or 4ohm
Its not about how hard your alt is working, more so when you 1000 watts or less.
It's about how efficient your amp is running
Run it at one ohm
The sundown audio SFB-1000 is $189.00
Soundqubed S1-850 will get the job done too $159.00
Pass on that renegade, Fosgate may own the company but its entry level at best
Please note that when I give prices it's to give a general idea of how much it costs
I have a couple "go to" places for looking up prices
Someone else may know where to get it cheaper
But don't treat me like I got a flower pot on my head just because you ran around the internet and found it for $10 cheaper
Sorry OP that's not directed at you