Here is the scenario. Rockford 4 channel amp (dunno what model, it belongs ot a friend) that I believe is in the neighborhood of 45 x 4 rms (rated). front 2 channels going to kappa 6.5 in the front, and the same in the rear. Car has locations for additional 4" speakers. He would like to utilize the 4's, but I need to verify what I am relaying to him. The front channels of the amp can handle 2 hom stereo, so run the 4 and the 6.5 off of it (parallel). Put a cap inline to the 4. 2 reasons. 1. passive crossover to riase the midbass crossover point on the 4 (gonne be running high pass off of the amp, so it will already by crossed over, just too low. 2. Passive crossovers absorb power, and the 4's have a lower power handling satbility. Im figuring if the amp does (rated) 45 x 4 at 4 ohms, it should do 80 - 90 rms at 2 ohm, so the 6.5 will get 40- 45 rms, while the 4 will get ~20 - 25. Been awhile since I messed with this end of the spectrum. Is this accurate? Or any other suggestions? The equip (except the 4's) has been purchased already, so a change in the hardware isnt an option. The sub will be a perfect 12 off of a 300w rms (roughly) fosgate as well.