No, a phone line is not cool to use.
I would recommend against using the bass boost, unless you are sure of how it functions. WHat amplifier do you have?
Those bass knobs affect input sensitivity, not bass boost //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif....well at least on my amp. But bass boost is usually a no-no, I hear it causes distortion.
they are only good if it is a true GAIN control knob, i have one for my hifonics but it stays in the same spot all the time i just adjust bass on the hu... if it doesnt adjust it down enough at zero on the hu ill turn the knob down....
omg guys, the "phone line" he is refering to is the bass knob. Have the knob set to the max, and adjust your gains with a DMM, and VOILA, it is an easier access to lower down your bass (ie. Police).