Audison APBMW BIAMP 2 Plug & Play BMW Mini Harness for Bi Amplify Front SpeakersAPBMW BIAMP 2 Accessories Plug & Play T harness for BMW upgrade APBMW BIAMP 2 Plug & Play T harness provides the ability to: 1. Take the front speaker output signal from the OEM head unit through the under seat woofer connector and route it to the AP bit amplifier input. 2. Separately route the signal from the AP bit amplifier outputs to the front midrange housed in the car door and to the sub underneath the seat, without the need to cut the OEM