I am trying to get as close as I can to get as close as I can to the sound as a Modulus Quantum with Barts sound as I can with a 94 Ibanez SR1306. I am looking at the Barts CF5CBC with a Aguilar preamp. With this bass I am limited on the pickups due to the size since they are 4.125 1.56 inch and I don't want to modify the body. I would really like to put the OBP-3 preamp in but I don't want to drill a hole for another knob so I will either go with the OBP-1 or 2. Anybody and any recommendations on the route I should go on this?