I have a 4 string flat top plectrum acoustic guitar that is built on the concept of a archtop. I would like to get a humbucker to mount at the at the base of the neck - like a neck-pickup. I recognize that I would need to get a 6-string pickup. There seem to be multiple choices of humbuckers. How do you pick one that has a warm, full sound that brings out the lower tones, as I am not eager to advance the treble sound? Thanks.