I have an Ibanez SR400 bass. I recently put in a Badass Bridge and a Seymour Duncan Quarter Pounder and a Seymour Duncan Vintage Jazz bridge pickup. I put it into my amp and there is an incredibly loud ground noise and humming coming from somewhere. It is unbearable. I put my ground filter on my amp on, and it is still noisy. Can anybody give me some suggestions on what the problem is, and how to fix it. Is it just that the guy that put them in screwed up something?