I recently posted a message on a pickup builders site asking what they thought the downsides to stacked single coil jazz pickups. i am sick of that age old jazz bass hum problem. but i want the sound! one guy suggested i just stick two jazz bass pickup side by side. now i know that the roscoe beck signature bass has this idea. any thoughts from users or those experieced with this axe? also do you know if they are like really specially designed? so if I try and do it on my bass i am going to run into big problems?