Car audio help. How many speakers can I run?

Hey guys. I just bought (second hand of course) some new audio stuff for my car: ✰ Head unit [US Audio] ( 4 x 50w outputs) ✰ 4 Channel Sony Xplod amplifier ✰ 2 x 6" Soundstream speakers, ✰ 2 x 6"x9" Fusion speakers, 3 way 275watts, 4 OHMS ✰ 300w RMS Soundstream Tarantula sub Basically, I have 4 speakers and a sub that I want to run (but only a 4 channel amp). Since I know nothing about car audio at all (my friend is going to install this for me, hopefully) I guess I want to know what I should do. 1. Run all 4 speakers off my amp and not use my sub 2. Run 2 speakers off my amp, 2 speakers off my headunit, and then run the sub off my amp 3. Any other suggestions? To be honest, any feedback would be much appreciated!!
Answer:

The HU isn't 50x4. That much power isn't possible out of a HU. Most advertise something similar, but that is peak power. Actual rms power will be in the 14-22w (rms) x 4 range. I would go with option 2. Amplify the front speakers and the sub. The rears will work fine off just the HU.

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Other answers

This will help guide you through the process of installation. http://www.ehow.com/how_5660595_hook-up-4_channel-amp.html and your best bet is to run another amp on/off a d block " distributor block " to your sub. you won't need a very big amplifier.

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