Short version: bought a new URB, in July, laminated, $1600.00 sounds good acoustically, but with either piezo (K&K) or magnetic PU the A string has virtually no fundamental from open A to at least the D maybe higher, I thought it was the strings, put a new set of Spirocores on it, sounds exactly the same. (acoustically it has a very boomy C on the A string. I have to EQ a lot of mid in the amp (SVT with two Ampeg B-15T's cabs) which I don't like to make the A sound close in volume with the other strings. Has anyone ever experienced this before? Could this be a set up problem? Solutions? the other three sound great and the D sounds better up the neck. I'm very happy with this bass except for this problem.