Fits: 2014-2018 Harley Touring Models with Radio
BT355 Line Leveler allows you to install an aftermarket amp and speaker system on your 2014 and up HD without flashing the radio.
Removes bass distortion when connecting an amp to the factory 2014+ radio
High quality three stage circuit for optimal sound quality and precise filtering
Adjustable level and frequency
Adapts high (speaker) level inputs to pre-amp outputs