The LOC converts high level speaker inputs to a low level input which most amps prefer.
The line leveler does that as well as flattens the signal coming from the infotainment system to minimize the spikes built into the various Harley flashes. It’s not perfect, but for most setups it’s way better than taking a chance with a flash. The best option to truly flatten the signal is a DSP but that’s a different thread.
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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.