I have the complete factory installed bose system with the sub behind the drivers seat. i am looking into getting an after market head unit right now. the system will come later. if i get a HU with 4 X 50 will all my speakers work, including the sub with no aftermarket amps installed just the new HU. If not what do i need to look for in a HU. looking for a high end one around 300-400

 

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ok i went to sound advice in tampa, and they told me i would but i needed to get:
2 adjustable output adapters
and Rca wire

can someone explain what they are doing so im not blind going into this