My 20 year old Carvin Bass had a stock Carvin MM humbucker and Jbass pickup with their stock preamp. I installed this quad coil MM4.4 with a NJSV and Trickfish Flex Core 4 band preamp. I'm blown away by the range of sound I can get out of this setup. Max even included a schematic to coil split the MM4.4 with a 3 way switch. Excellent service and communication. Fatbasstone.com is the best!