Adding a Sub & Amp - wiring issue, please help!
Thread Starter
Junior Member
Joined: Jun 2019
Posts: 23
Likes: 5
E63 BiTurbo
Adding a Sub & Amp - wiring issue, please help!
Hi, I was hoping someone might be able to help with my 2012 E63 with the Harman Kardon Logic 7.
After reading lots of great info on here about adding a separate amp and sub to my logic 7 system I installed a 12" JBL at the weekend with a matching JBL amp, my problem is the RCA signal just puts my amp into protection mode for some reason. It's a brand new amp and I tried it with a different signal and it worked fine, so it's not faulty.
I have tapped the small White & Brown wires from the original amp on the rear deck and the medium black for the turn on signal. The problem seems to be with the earth of the RCA signal, as soon as it touches the amp the unit goes into protection mode. The original amp/subs work fine.
Have you got any ideas? I have had to use the high level output (Green/Green Brown) to get it to work, but it doesn't sound as good as it should. Is there somewhere else I could try to tap the signal, possibly the other amp?
Many thanks all!
Cheers.
Trev
After reading lots of great info on here about adding a separate amp and sub to my logic 7 system I installed a 12" JBL at the weekend with a matching JBL amp, my problem is the RCA signal just puts my amp into protection mode for some reason. It's a brand new amp and I tried it with a different signal and it worked fine, so it's not faulty.
I have tapped the small White & Brown wires from the original amp on the rear deck and the medium black for the turn on signal. The problem seems to be with the earth of the RCA signal, as soon as it touches the amp the unit goes into protection mode. The original amp/subs work fine.
Have you got any ideas? I have had to use the high level output (Green/Green Brown) to get it to work, but it doesn't sound as good as it should. Is there somewhere else I could try to tap the signal, possibly the other amp?
Many thanks all!
Cheers.
Trev
MBWorld Fanatic!
Joined: Apr 2008
Posts: 1,399
Likes: 201
From: Bay Area, California
2015 E63s AMG, 2020 GLC 43 AMG
I did a large write-up on this about 3 years ago for my 2011. Read through this:
https://mbworld.org/forums/w212-amg/...rade-w212.html
https://mbworld.org/forums/w212-amg/...rade-w212.html
Thread Starter
Junior Member
Joined: Jun 2019
Posts: 23
Likes: 5
E63 BiTurbo
Many thanks Vrodman, I actually found all your info before I started, it was a great help so thank you!
I still can't work out why it is not working, would using a line out converter be better that the high level inputs on my amp?
Many thanks
Trev.
I still can't work out why it is not working, would using a line out converter be better that the high level inputs on my amp?
Many thanks
Trev.
MBWorld Fanatic!
Joined: Apr 2008
Posts: 1,399
Likes: 201
From: Bay Area, California
2015 E63s AMG, 2020 GLC 43 AMG
Now you have a 2012 which is very close to the 2011 so I am surprised at your issues. I just don't know when they went from 1 flat sub to 2 which drove the color changes in the wires. If it was 2012, then maybe you have the wrong wires. Pretty sure if you take it to any reputable stereo installer they can figure it out for you and fix it for less than $100.
Good Luck
Thread Starter
Junior Member
Joined: Jun 2019
Posts: 23
Likes: 5
E63 BiTurbo
Many thanks for your reply. Mine is the Biturbo and has the later set up with the start stop battery and 2 subs.... possibly the wires could be wrong but I don't really know how to find out!
I might try a LOC, I just haven't had the best of luck with them before with interference, admittedly using a cheap converter. Can anyone recommend one to try?
Many thanks
Trev.
I might try a LOC, I just haven't had the best of luck with them before with interference, admittedly using a cheap converter. Can anyone recommend one to try?
Many thanks
Trev.
