Mmmm. I looked at that thing 4 years ago when I was upgrading my last car, and decided probably the most useful aspect was time delay, but that probably wasn't worth the money.you might want to invest into something like this: https://www.minidsp.com/products/car-audio-dsp/cdsp-8x12-dl
But now you are annoyingly getting me thinking that's probably the way forward! So I now I need to find USB-C to SPDIF/TOSlink cable... Does that even exist...
And we're way over budget now, haha!
Or maybe I should save the cash for the speakers and just get this... PEQ would be nice over BMW's 7 band EQ...If you want PEQ get the Qudelix
But this chart suggests it may not be great for line level 2v output: