Will this amp push two Rocksford fosgate 4 ohm 12" subs

For 2 12" R2D4's I'd suggest going for the R1200.1D. Should be more than enough to power them. I'm using it for 2 10" R2D2's and a single 12" R2D4 all wired up together at 1 ohm.

With the P600x4 . I want to power my 6.5 components and a set of 6x9's all of which are about 100 watts RMS each. What is the RMS @ 4 ohms on amp

I would look at other amps. One of these doesn't have enough power for my doors. Their 2 channel does a decent job on 4 6x9. Their anticlip feature leads to amp cutting in and out annoying feature.

Is this amp 2ohm stable?

Yes sir.. it is 2ohm stable. I'm running a single 10" 4ohm DVC bridged to the rear channel with (2 0hm) 6x9s running off the front channel in the rear deck and it sounds great. As long as you dial it in as per the C.L.E.A.N. instructions you'll be really happy with this RF amp.

What is the true rms power on the 600x4? I know these amps are under rated

The short answer is above 600 rms total. Every amp comes with a birth sheet that shows the results of a Amp dyno test performed on the amp. Mine was 191 rms per channel @ 2 ohms which translates to 764 rms total. Every amp sold by Rockford is underrated so expect to see a larger rms rating than advertised. I've seen birth sheets for this specific model ranging from 750 rms up to the high 900 rms range.

Item dimensions L x W x H	11 x 7.8 x 2.4 inches
Voltage	12 Volts
Manufacturer	Rockford Fosgate
Mounting Type	Car Mount
Brand	Rockford Fosgate
Number of Channels	4
Output Power	400 Watts
Global Trade Identification Number	00780687342272
UPC	780687342272 739197278595 796327931423
Item Weight	6.93 pounds
Product Dimensions	11 x 7.8 x 2.4 inches
Item model number	P400X4
Batteries	1 12V batteries required.
Is Discontinued By Manufacturer	No
Wireless Remote	No
Warranty	1 year
Height (inches)	9 inches
Width (inches)	5 inches
Weight	11.3 Pounds

P400X4

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