3K?... who knows?.. I'm still trying to find an efficient port/box combo... I tried 3.5K but am trying a higher power level next... LOL!.. I just don't know... that's 1/2 ohm on each amp so it MIGHT be a little more than THAT... LOL!.. You could run that 900.4 to those Skars... that's what levels are for... just blend them in...OK 2 cabs strapped . Is that about 3k. I need something that's going to be heard over the bass. I will see what 2 ch. Amps I could find