Originally Posted by Fsfiorenini
Sorry for the confusion.
I meant to say RCA from HU to amp.
As far as the Y adapter, After talking to a few people they said it was needed.
Honestly, I am open to your suggestions about amp and sub connections. Feel free to give an and all suggestions.
To connect the RCA outputs of the headunit to all four inputs on your amplifier you will need two Y adapters (single male to double female). Connect the Y adapters to the headunits outputs. You will then connect the RCA cables from the Y adapters to the amplifier.