Originally Posted by saved
hi,i started to build for first time a bass.but i have 2 qwestions.should i glue the truss rod?and how can i find if the pickups i have are active or passive?
A preamp is "active" meaning it is battery powered/activated - either 9 or 18V. You can use an (active) preamp w/passive pu's. The majority of pu's are passive. Some EMG pu's are active only. They are usually low impedance to prevent hum. What do you have?