Resurrecting this post rather than starting a new one...
I've an early 2018 facelift DCIV for our family bus. Like many others, I'd like to hook up some rear speakers. Reading extensively on the forums, it seems that the updating the IDS to switch on the rear speakers is not straight-forward on the facelift models (and my local dealership seems uncertain) despite the wiring being in place. So, this leaves a couple of options:
1) Simply splice into the front speaker cables and run lines to the rear cab. This obviously would prevent any fade control and may not be massively healthy for the HU?
2) Let the HU power the front speakers but use a harness (e.g.,
https://www.skiptoncarradio.com/ford-sy ... 3224-p.asp) to enable rca output to an amp and then drive the rear speakers from the amp. This setup could later be updated to drive the front speakers from the amp when budgets allow! Fade could potentially be set by altering the gain of the rear amp?
Has anyone done any of the above? Do the setups work OK? I'm a complete newbie when it comes to car/van audio.
Thanks
Rick