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Sony head unit problem

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Hi guys,


I've just changed the speakers in the parcel shelf (6x9s) back to standard (6x4s) and they worked when testing individually but now they're all connected, only the front right is working. I hadn't even touched the front left and it was working before I changed the rears but now doesn't work at all. It's a Sony xplod head unit (Sony MEX BT3700U) with Alpine speakers front and rear. No amp or sub. I'm thinking the head unit may have been damaged or gone into some sort of safe mode or something...fade to left or rear gives no sound at all, but front right speaker is working fine and sounds great. No dodgy connections to other speakers so can only assume head unit is at fault...? I've tried resetting the unit but it hasn't helped.


Any advice anybody can offer greatly appreciated.



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