I’ve searched the forums and read the rave manual, but some of it (I’m sure the part I need to understand) is a bit above my head.

2004 Disco 2. Replaced a very old aftermarket deck with a brand new one. Problem I’m having now is, I can change the settings on the deck to get the front speakers and subs working or the front speakers and rear speakers working, not all three.

Any thoughts?

 

Also, instead of splicing into the stock controls for steering wheel control. Anyone used this? Gives me the bluetooth I want, looks stock, and should work with all of the original wiring.

https://www.jegs.com/i/1-Factory-Rad...670BT/10002/-1

 

You replaced it with a brand new OEM radio or aftermarket radio?

In regards to your second question - for the money, there are just too many other options to justify buying that particular radio.
Look up Joying radios - you can get one that fits the single DIN space with a large screen and has a massive amount of features.

https://www.joyingauto.com/single-di...ingle-din.html

There is a thread on here about wiring this up and connecting it to your stock steering wheel controls - the radio has this capability built in which is very nice as no other radio I've shopped does.