Add an Amp Audio Output Adapter. Use this adapter to make your installation of an amplifier to the factory system faster with a cleaner install. Use this plug and play adapter so you don't have to cut or splice into the factory wiring. For adding a bass amp for woofer/subwoofer. Adjustable gain output. Compatibility Notes: Only works with base amp systems that have the factory external amp usually located in the back area of the vehicle. Not compatible with fiber optic systems. Connection is done at the factory amplifier. This adapter doesn't have a remote amp turn on wire- use an amp that has auto amp sense detector or you can find your own amp turn on wire which might be at the factory amp. Compatible vehicles: Base amp systems only- no factory fiber optic systems: Made for BMW: 2008-2020 1 Series, 2014-2020 2 Series, 2007-2018 3 Series, 2014-2020 4 Series, 2010-2016 5 Series, 2010-2017 6 Series, 2010-2015 7 Series, 2013-2020 X1, 2004-2020 X3, 2015-2018 X4, 2014-2018 X5, 2015-2019 X6; Made for 2007-2015 Mini Cooper