As I go through the menu to change bass, treble,and balace, the last option is TONE LINE? What does that do or how do I change it? Every time I get to it I try to hit different buttons to see if it changes any settings or sounds any different but I cant figure it out. Does anyone have any idea what it is or how to work it?

you know, i think it means "Linear" but i'm not sure.. I've also wondered the same thing numerous times, yet too lazy to read the manual. anyone know?

you know, i think it means "Linear" but i'm not sure.. I've also wondered the same thing numerous times, yet too lazy to read the manual. anyone know?
I asked a friend of mine that works on car audio, he told me he thinks it might possibly be some kind of equalizer? But I dont see any way for it to be that because I cant find a way to adjust it. Maybe someone else on the forum can let us know. thanks everyone.

I was wondering about that too, haha, someone please chime in.

... pressing the button of Tone Line put the bass and treble settings in the middle position. See it as some tone "reset" feature. :peace: