Only one speaker working??

[Damo]

Any ideas what might be causing this issue??
Only the passenger side door speaker works in the Hdi and don't want to start digging around for ages trying to work out why if someone here may have a simple solution?  
They are all wired up properly

[Matt]

Settings on hu?
Broken wire? Checked plugs and all connections?
Connected properly at back of hu?
Power going to that particular speaker?

[Toms306]

Door loom broken

[Damo]

Hmm will start checking later. Have changed all settings but nothing. Have checked all wires behind Hu. And Hu all wired up fine

[Pug0BZ3011]

Hmm will start checking later. Have changed all settings but nothing. Have checked all wires behind Hu. And Hu all wired up fine

Easy way to test if thier getting power- headphones on the connections easy tip