If you're switching over to the BT line leveler the bike will need to be flashed back to stock configuration and you'll use the low level inputs. By stock configuration I mean 2, 4, or however many speakers you have and 0 amps. If you go with any flash that includes amps, the line leveler is still fighting the signal issues that it is designed to minimize and your results won't be as good. Very good post over at the other forum audio section that explains this in better detail than I can.
Freedom isn't free, remember to thank a vet.
2018 CVO RG lava orange, 117 Stage 3, 14" F47 and a few chrome extras. Boom crap gone.
2016 RG Special Cosmic Blue, 120ST with Dragos 2:1 and TTS tuner, FBI drop seat kit and JNR air ride. Stock audio long gone.