I recently picked up the HXB-406 and the sound man has told me that it is noisy, . . . . I kinda figured that since I've heard others say that. But he also says that he has to boost the gain up pretty high in order for it to be heard. Now, it does have the active/passive pushpull volume knob, and has a single 9 volt battery. My question is, I am planning on (sometime soon) switching out the electronics and pickups for some Bart stuff. Since this bass has only one 9 volt battery place available, would a new Bart preamp and pickups still have this problem, or are they 'hot enough' to help my sound man out? I guess a side question would be, for the pickups, would I want to go with split coil or the quad coil, if more volume is needed, or would that have nothing to do with it? Thanks for whatever help you can offer!