Acoustic feedback (back coupling) while calling

[Christofson]

Hey folks,
since I have installed theVLINEV2 in my SAAB 9-5 NG everyone who calls me tells me they can hear themselves with a little delay what is very annoying. Today I called my wife while she was driving in the SAAB and it is really bad. Inside the car everything sounds quite normal. Using the supplied GROM microphone which I installed next to the rearview mirror.
Any ideas what could cause this problem?

[admin]

Hello,
You need to adjust the microphone gain. If you are using the GROM-supplied microphone, the best position is around 45. To adjust the gain - while in the VLine user interface, tap on the sandwich menu at the top left-hand corner. Then scroll down to the Microphone Gain settings.
Here is how to:
https://youtu.be/ODCCTMaSUM4

Adjust it to your liking, but 45 is the best setting for aftermarket microphones, according to our recommendations.

[Christofson]

Hey Heath,

thanks for your support!
I tried to do the „auto“ calibration as shown in the video but it gives me the following message after one peep:
„music tone is not sensed“
do I need to turn the volume up even louder than it already is?

[Heath]

Hello Christofson,

The "Automatic Microphone Adjustment" might not always work well at 25% depending on multiple variables in the vehicle, including cabin size/volume and audio system configurations. Normally I would suggest putting the volume around 25% and slowly working up to 50% if it's not being sensed. If the signal is still not being sensed via the "Automatic Microphone Adjustment" at 50%, there might be an issue with the microphone itself.

Can you contact us via Ticket so we can follow up with you? We might need to send you a replacement microphone or look into retaining your OEM Saab Microphone.
Here is where to contact us via Ticket:
https://gromaudio.com/support.html

Thanks,
Heath
GROM Audio

[Christofson]

Hi folks,
received the new microphone and the new harness - delivery worked flawless, thanks a lot.
I replaced the harness and I can now use the OEM microphone which is great - unfortunately the same problem still appears.
Callers hear themselves (with a slight delay) twice - like an echo.
i still have two ideas (not tried yet) but this would be just a temporary fix for me:
- use wired car play/android auto (instead of wireless)
- turn off the Harman/Kardon sound processing

any other idea what could cause this problem?

btw: the auto volume leveling of the OEM microphone works like a charm now.

thanks a lot,
Chris