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I have already changed out my stock front speakers for Pioneer 3-ways, and I've added a sub and a 4-channel US Acoustics amp. The amp runs the fronts on channels 1 and 2, and the sub on bridged channels 3 and 4. I was going to run the stock rear speakers from the head unit, but I decided that it sounded better with just the fronts and sub for now.

I bought another set of Pioneers for the rear deck, but before I tackle that install, I wanted to decide how to power them:

My first choice is to get another US Acoustics amp (either mono or 2-channel, bridged) and use it to power the sub. That would free up channels 3 and 4 of the 4-channel amp to power the new rear speakers.

-or-

I could run the fronts and sub on (bridged) channels 1 and 2, using a Tri-Way (100Hz) crossover I got from Crutchfield a while back and run the new rears off channels 3 and 4.

My question (finally!) is: if the amp's bridged output is 160 watts/channel RMS, how is the power distributed among the 3 speakers using the Tri-Way crossover?

 
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Get another amp for you sub.

 
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You don't want to bridge or crossover your front speakers with your subs, you would have no high end sound up front and thats where you want it. Personally I think rear fill sicks. If you just get a good set of speakers up front like a component set and it will sound great.

 
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I wouldn't power the rears. Use deck power. Even then you will be surprised how loud they are. Besides it will mess w/ the imaging if the rears are very loud at all.

Besides trying the rears w/o an amp costs nothing. If then you think you need more buy an amp afterwards. This is better than buying an amp and then realising you don't need it.

 
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i too have had great success having rears onlly on deck power. i highly reccommend it fpr those who want to keep rear speakers!

 
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Thanks for all the advice! I really appreciate it.