will this active setup destroy my 4 channel?
 

I have rockford fosgate p800.4 (4x150 rms) and i wanted to run an active setup on both my fronts and rear speakers (seeing as i dont have money for another 4 channel) will my amp blow due to the load? Should i just run the rears off the deck?

Maybe I'm confused, but do you have front and rear components? It won't blow, each channel will be running at 2 ohms, the only difference is that the woofers wont be getting as much power, and the tweeters will.

oh true.......well at 2 ohms its 200 rms a channel......i guess i'd have to play with the gains :P

You will almost indefinitely blow the tweeters then, 100w to a tweeter is bad news... low gains won't save them.

yea you are very correct.........and im guessing there is no way to wire the tweets in order to have a 4 ohm load between 2 speakers (50 watts rms)?

Nopers. 2 ohms or 8 ohms.

How is 100w going to blow a tweeter? When you power a component set with 100w the mid and tweeter get 100w.

100 watts divided by 2 voice coils = 50 watts per...

100 watts divided by 1 voice coil = 100 watts per...

I guess that would be the differece :)

i run my active components with 125 wrms on the tweeters and mids. Active setups sound best with the same amount of power available for mids and tweets. Of couse the tweets don't need and won't use all that power, its called headroom, and thats a good thing. The same amp is also better for tracking, so they have equal power at different volume.

If i had my choice, i'd use the 4 channel amp for front only, get another amp or use deck power for the rear.
JMO, good luck.

P.S. You could try it both ways, test it, let us all know how it works out. :smilie_da

Wire the tweets in series....75 per and be careful with the gains and you should be fine.