This EMG 40HZ really brought my cheap Dean Edge 09 to life! Very articulate, deep and clear tone. Since it has rails instead of separate pole pieces, it works fine on a 4-string like mine too. But it was a few mm's wider than the original, and I had to do some milling in the bass' body. The solderless installation of the pickup, pots and output jack was a breeze! The wiring diagram for a one pickup volume/tone configuration puts the pickup in series humbucking mode by default. Apparently on the EMG website there are coil switching options described, but I didn't bother. I like it the way it is!