Hey all, looking for a quick sanity check before I commit to an audio overhaul in my E90.
I tried staying OEM first, but the head unit situation kept turning into a rabbit hole.
Background:
2006 E90 330i Logic7
CCC failed → attempted motherboard repair, no success
https://www.youtube.com/watch?v=Q0xz_DavLKw
Then did a pre-coded CIC retrofit + screen:
Never fully stable (red screen/BMW logo cycling before EVENTUALLY getting to the home screen)
No audio output
Factory amp didn’t show in diagnostics
TCU threw “present no message.”
Before chasing MOST faults further I got sidetracked by a radiator failure, and honestly at that point I was over fighting OEM electronics.
Also not concerned about SOS errors/telematics warnings at this stage.
Current Speaker Setup:
Bavsound Stage 1 kit (doors + rear deck speakers)
Factory underseat woofers still installed
Aftermarket trunk sub with Technic add a sub (~500W RMS amp).
Plan Now:
Basically simplifying everything:
Remove factory Logic7 amp
Install Eonon Android head unit
amazon.com/dp/B0FGZQQ9HN?ref=ppx_yo2ov_dt_b_fed_asin_title
Run analog RCA to an 8-channel aftermarket amp
https://www.amazon.com/dp/B00UMIRE4A...sin_title&th=1
Keep existing sub amp
Use my TechnicPNP add-a-sub harness as the splice interface (avoid cutting factory wiring).
For MOST:
I have fiber loopbacks if needed, but since audio won’t be on MOST anymore I’m not sure it’ll matter.
Channel Layout Idea:
Amp groups channels 1–4 and 5–8:
Channels 1–4:
Front + rear door speakers
→ HPF around ~100 Hz.
Channels 5–8:
Rear deck + underseat woofers
→ LPF roughly ~80–100 Hz.
Center speaker deleted.
Power Plan:
Two amps total:
Rockville 8-channel (~750W RMS rated)
Existing sub amp (~500W RMS).
Separate fused 8 AWG runs from trunk battery, common chassis ground.
No distribution block planned unless I run into voltage issues.
Mainly Wondering:
Am I missing anything obvious here?
Anyone run a full Logic7/MOST bypass long-term?
Just trying not to create a bigger headache than the OEM system already gave me 😅