Axxess ANC-GMH4 Active Noise Cancelling ANC Bypass Harness for Select GM 2020 Vehicle Electronics & GPS while the subwoofer pre-output gives

while the subwoofer pre-output gives you the option to add some extra bass to your music

RYDEEN CM-LIP4

Power and protection LED indicators

HR-V 2016-2017

Axxess ANC-GMH4 Active Noise Cancelling ANC Bypass Harness for Select GM 2020 Vehicle Electronics & GPS while the subwoofer pre-output givesBRAND NEW AXXESS ANC GMH4 Active Noise Cancelling ANC Bypass Harness for Select GM 2020 Key Features: Active noise canceling bypass harness Fits non amplified GM vehicles with ANC audio systems, in a variety of RPOs Enhances sound quality during audio system upgrades Eliminates unwanted ANC interference for complete sound customization Protects vehicle electronics Quality connectors Always check vehicle warranty before altering the audio system to