Bill Lawrence L-250's, many different Lace Sensors, and Fender's noiseless SCN series of pickups are exceptionally quiet and good sounding units - all have clarity, definition, and power without using batteries. Fishman Fluence also makes quiet units, but they run on batteries. And then there's Bartolini.... You can run w/ batteries or without. My guess is Lindy Fralin makes some quiet units, too - but I'm only familiar with his Noiseless P-90's.