car audio

HI people, I'm thinking of upgrading the rear amp in my 56 plate, not thinking of anything super high power i just want to run a larger sub, what gauge is the stock amp power wire? as if possible i would like to use that but obviously if i can't no big deal, the audio wiring is already there...

Sooo i got a set of 4 Focal K2's for my A3 8P. Bought them from ebay but got only 2 crossovers. Now i found the 2 0f the same exact crossovers again, my question is do i need crossovers for the rear speakers too ? They are components front and rear, not coaxial.

Hey, I bought a Dension gateway as I thought this would be a nice way to bring my 20th century cassette head unit into the present day, retain the OEM look and have something that is concealed. It has a USB function on it that you can leave a stick plugged into, so I'm planning to mount a USB...