I’m looking at installing rear speakers in my Polo 9N. I’ve had the door panel off and seen that there’s definitely no speakers. I’ve found the size of speakers that I need, but I have to issues. I know that I need a harness/adapter to fit the speakers but not sure which ones. I also then don’t know how to attach these adapters to the main speaker plug behind the radio, it only has pins for the front two speakers, and blank spaces for where the rear ones would be. 

Have a feel around inside the door, if you're lucky it might already have the wiring in there just clipped out of the way.

 

Adding the wiring in isn't bad. The pins are a small spade connector, so you can get some uninsulated terminals and add them in fairly easily, it's just pulling the wires that's a pain. 

Edited 18 August, 20223 yr by Yeti

Depending on what radio you have fitted ? it might not have any output for the rear speakers 

My radio definitely has output for rear speakers, just the connector in the car doesn’t. 
 

I’ll have a look but I’m convinced there’s no wiring already in there. Would it just be any small spade connector? I don’t have to get a certain type do I? 

The contacts for the OEM radio connectors are These