I bought a cheap 5 string bass for a project. Tweaked the neck and it plays great. Problem is the low b string had no volume. Put a set of Carvin strings on it, my usual, they do fine on my other 5 string. This didn't help. Took off the cheap P-bass pickup that came on it, installed a Seymore Duncan Quarter Pound P-bass pickup on it, that helped a lot, the other four strings sound awesome. This is a passive setup. My other bass is passive also, it booms on the low b. I moved the half of the pickup that goes under the low b out to make sure it was catching the string, that helped a little. Now, if I play an E on the low B string it is as loud as if I play it on the E string, but notes below that just aren't there. A low C has practically nothing and I have to hit it hard to get anything. Do some pickups have frequency rolloffs? Can the resonance of the body roll off freq's? Do I need to move the pickup out more. Can a P-bass style pickup work on a 5 string?