There is no feedback through the loom to the MMI's amplifier as its an output and now just a pre amp and the 65.4 is the main amplifier which as the front coaxial's have a passover they will separate the sound themselves if that makes sense but there shouldn't be a return into the factory amp on the MMI
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What do you mean by "There is no feedback through the loom to the MMI's amplifier" ?
As far as I understand and know the whole audio system in the Arona works like this:
There is the dashboard infotainement display unit (which is just a touch screen display), the display is only a display and all the "magic" happens inside the MMI, the MMI "holds" all the infotainement features (GPS, Bluetooth, tuner, audio DSP and class D amplifiers, etc....), there is no audio signal runing in between the dashboard's infotainement display and the MMI, only "control" signal.
The DSP built in the MMI unit splitting and crossing over elctronically the analog signal that goes to the MMI built in amplifiers, there are 3 types of analog signals after the DSP, high pass analog signal going to the tweeters amplifier, bandpass analog signal that goes to the front doors woofers and full range signal that goes to the rear door speakers amplifier.
Unless you used a VCDS and such to re-program the MMI built in DSP it's not possible that you get line level (called also low level or pre amp level) signal/s from the MMI's Quadloc connector.
If you're connecting the speakers outputs in the MMI's Quadloc to your Vibe amplifier you are connecting a high level (amplified) signal to your Vibe amplifier inputs (can only connect it to the high level inputs in the Vibe amplifier, NOT to the RCA inputs!!!).