S211 Headunit Replacement, Options?


It currently has the H/K system with the navigation stereo. Of course it is old, and very limited to what it can do.
I have an aftermarket sub stage ran off an LOC, currently. Which it sounds nice, but I can't get over the options I have for playing music with my stock stereo.
Ok, so here is where my questions/thoughts come in... I really don't want to run a Chinese Android stereo (unless it really makes my life that much easier). I would like to maybe just do a double din Kenwood/JVC, or something similar. The real issue comes into play, however, on how to run any stereo with our factory H/K system. Is it worth it? Should I spend the extra money and have all the stock stuff ripped out? I have seen people using something like this --> https://avinusa.com/most-fiber-optic...-slk-s-cl.html
But then I have also heard people run their aftermarket head unit directly to the speakers/amp... I am pretty savvy with this, but it gets quite confusing. Also, what fiber optic loops do I need to accomplish any of this?
With all this being said, what are some options you all took? I would like to retain the factory speakers and just use them, if possible... But if it is going to be this huge task, I will go ahead and just purchase 2 sets of comps and by-pass the entire factory setup. Thanks for any help and or insight.



Recently, I found news of one out of Russia, from a company called Trioma, that
incorporates a sort of software-simulated fader capability. I may be springing for one of these for my 2005 E320 CDI.
You can find them on eBay but the vendor has a website as well.
The issue with people running "barefoot" is that the factory Harman-Kardon system has speaker impedances that are not your typical 8 Ohms, and it's possible to damage your speakers or something else if you run your replacement head unit directly to them. Some people seem to report that it's fine. I'm betting those are people who take great care about volume settings before they turn off their car, and who smack passengers' hands if they try to touch the volume knob.


Recently, I found news of one out of Russia, from a company called Trioma, that
incorporates a sort of software-simulated fader capability. I may be springing for one of these for my 2005 E320 CDI.
You can find them on eBay but the vendor has a website as well.
The issue with people running "barefoot" is that the factory Harman-Kardon system has speaker impedances that are not your typical 8 Ohms, and it's possible to damage your speakers or something else if you run your replacement head unit directly to them. Some people seem to report that it's fine. I'm betting those are people who take great care about volume settings before they turn off their car, and who smack passengers' hands if they try to touch the volume knob.
And that makes sense. I believe the speakers are 4 ohm? I am a little confused on how processing takes place when you run the stock speakers off an aftermarket headunit... Since I have a 3 way front, is there some kind of xover that is between the amp and the speakers?
Let me know if you end up purchasing the adapter, however, I am really curious on how well it works.






I find that using my aux connection has no where near as much volume as using the CD player.
I will be honest, if my CD player worked well and my CD changer worked well, I would probably just leave it as is.


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here’s the link
https://gromaudio.com/store/most_ada..._optional.html
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