Aftermarket Head Unit - Ground Loop Isolator - Subwoofer not working - BOSE

[nmthkrs]

Hi guys!

I have purchased an aftermarket head unit to my Bose system S3.
After i installed it, everything worked well (rear speakers, subwoofer), but i had a really annoying alternator whine.
So i purchased ground loop isolators, connected them. Now i don't have the alternator whine finally, but my bose subwoofer is not working.

Any ideas how can I make it work?
Thanks!

 

[buges]

Disconnect the isolators and connect the rca cables together again, if the sub comes back then you know it's the isolator. Is your isolator 12v powered?

Can you post a picture of your isolators.

 

[nmthkrs]

If I disconnect the isolators then I get the annoying alternator whine back, but my subwoofer is working.
I got my isolators form aliexpress, there are the specs: 2 rca male, 2 female connector. Current rating: 20A, Rated input: 30W, PK input: 60W, 12V

 

[buges]

So definitely the isolators then, i think whats happening is they are cutting off the lower frequency range.
I can't remember which ones i used, as it was a few years ago when i installed my 3rd party headunit.

This should do the trick: https://xtrons.co.uk/harness-adapter-ak-inib-nrcbl

All so (but i don't know if it's necessary) I disconnected the Gala microphone located in the front roof lights.