I have a cheap ($120.00) bolt on Douglas 6 string bass that I refinished the top just for the fun of it, however when I play on the A-C strings, the B and E strings start to vibrate...most annoying. I have DR TMR6-30 Tapered 30,45,65,105,125 strings that replaced the factory strings. Now, on my StringRay5, with the same amp in the same room it does not happen. Could this be due to the strings? Or is it just due to the poor design/craftsmanship? One thing I noted, is that it has a basswood body which is relatively soft wood. In refinishing this bass, I sanded off the lacquer and put a walnut veneer on it. I then coated it with tung oil. This gives it a softer body in which the bridge attaches to. Any help on this is much appreciated.