Amp and sub install makes weird pulsing/humming using LOC

[itsnotdustin]

I have a 2018 Edge Sport with the Sony system. I have a line output converter (LOC) tapped into the subwoofer wires. I have a Skar 1500w amp and 4 10s. 

 

The problem: Every time I turn my car on, the subwoofers pulse 3 times. It's a slow but loud pulse/hum. I'm pretty sure it is an issue with the LOC, but before I cut it out and replace with another one, I wanted to see if anyone else has had this issue. 

 

I'm using this LOC - https://www.sonicelectronix.com/item-40540-NVX-XFLOC2.html

Here is the install post for reference - 

 

Update: I ordered an Audiocontrol LC1i.....we will see if that fixes the problem. 

Update 2: I installed the Audiocontrol LC1i and it didn't fix the issue. With more research I found a post saying the ANC (active noise cancelling) could be the issue. Well I opened Forscan, pulled up the DACMC module, and disabled both ANC and Engine Enhancement. Problem solved. https://www.forscan.org/forum/viewtopic.php?t=8413

Edited October 3, 2021 by itsnotdustin