on my b2 quartto, it has a TLA setting on its channels, but dont know what they do and i guess neither does google, and there is a switch thats labeled Range, and had a x1 setting, or x20 setting, and the crossover setting has HPF, Full, TLA, and there is a notch in between each of these settings that are not labled on both channel sets. And there is a LPF but im not sure if i need to adjust this since these arent powering subs. Can anyone creak these down simply for me so i can go tune them if needed later