Head unit

CyphorUK

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New to the forum and my first Audi!

The car already came with an aftermarket stereo but the sound in the back wasn't working, and reading around I know I require the RCAs (which weren't plugged in funnily enough!).

However, what I thought was strange is the car has two quadlock connectors and cannot find anything online about it. Is this normal and is there any information anyone can point me to for this?
 
Without year and model, my 2011 S3 has two quadlocks. Halfords typically sell the adapters.
 

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