Since everyone seem to hate sony xplod i have listed other options down below
Planning to buy this head unit http://www.sony.com.au/product/cdx-gt490u#manuals
But while i was searching for head units i realised some has 2 pre out some has 1.
I have read pre out is for connecting up to amp which connects to sub. Could someone please give me an overview of what pre out actually is?
I have an EP3R with 4 speakers (2 front 2 rear) and i dont have sub. Can I still use this head unit in my car or do i need to get an amp for it to work?


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