Front speakers very low volume

[Bwanapeter]

My recently-acquired base spec D3 TDV6 was bought already fitted with a JVC KW-AV51 a/v unit. The rear speakers work fine but the front ones only provide a very low volume, left and right the same. The fader/balance settings are not the culprit. The 4 sets of speaker cables coming out of the rear of the unit all have power according to the multimeter. Any ideas please? Thanks in advance.

[Aussie Jeepster]

Do you know if they have ever worked correctly or is this a "new" thing?
If they have never worked correctly, it could be they are the wrong impedance speakers.
If its a new thing I'm not too sure.

[vee8auto]

you cant measure the audio signal with a multi meter.

And this thread would be be better located in the car audio etc forum on this site, especially if its just a generic head unit and not a Land Rover optional model.

[Bytemrk]

As suggested, I've moved this to the car audio area - being a none standard system, hopefully you will get more help here....

[Boof Ed]

My fronts quieten (not mute) the front speakers when sat nav "speaks" - as in says next turn...
Not sure how the factory system controls that but possibly a wire plugged or not plugged into the after market head unit?

[Bwanapeter]

Do you know if they have ever worked correctly or is this a "new" thing?
If they have never worked correctly, it could be they are the wrong impedance speakers.
If its a new thing I'm not too sure.

The speakers are the original OEM units so presumably they worked when the JVC head unit was installed, although of course I can't be sure.

[Bwanapeter]

My fronts quieten (not mute) the front speakers when sat nav "speaks" - as in says next turn...
Not sure how the factory system controls that but possibly a wire plugged or not plugged into the after market head unit?

I'll check that too. Thank you.