Now this is interesting. Shouldn't be much of an issue to make a hidden install with this board.
If you go the BT-route, would it be possible to parallel the BT and Aux input to the board? Or would that cause interferance?

Edit,
Or something like this? Disables BT if Aux is connected.
https://www.tinyosshop.com/index.php?route...uct_id=787 2007 L322 3.6 TDV8 Stornoway

I have a ugreen bluetooth plugin that I use with this amp. I will, at some point, integrate the two and hide them. Some fine soldering involved, but other than that it should be quite straightforward. They work fine together, but I need to add a remote switch to operate the ugreen phone pick-up etcetera.

Henrik

Firstly, for that to work, you would have to have the BT incorporated with the amp in such a way that it would be disabled when you plug into the Aux. It can easily be done with a switching jack socket, but then you would have to install that in place of the original if you wanted to keep the original appearance and location of the aux socket. It could be a challenge in terms of the actual permanent install, but technically speaking it wouldn't be difficult. I won't bother, simply because any aux source I would use supports BT anyway.

On the amp you suggested: This has 2x8w output and is designed to drive speakers. It's much too powerful, I'm afraid. What you need is a line preamp or a vloume-adjustable headphone amp.

Henrik