a 5k is a perfect match to a pair of XLs in my opinion
if you were doing a single XL id keep your RF T2500BDCP that amp is a beast and i wouldnt even sell it, i love mine
Exactly what they said, can run off one all day, so that's going to be my purchase! As for the rockford amp, its definitely nice, however I don't really like how it prioritizes its power more on the lower notes. Sure I love my lows and its mainly what I listen to but when a song with a higher not comes on, I gotta crank my sub level up on my deck. I'm putting it up for sale this weekend on caraudioclassifieds and such, since I don't have enough posts for here yet.
im sure youll be happy with it, i have a DC 175.4 and its beast mode,
as for the RF, when you set a amps gain and what not, you usually have the sub level on the deck all the way up, then set the gains
i have my T2500BDCP on my Single XL 18" @ 2 ohms and doesnt skip a beat on lows or higher notes, and is MUCH louder and cleaner then my AQ2200D i had on it @ .5 ohm