Hey guys! I just purchased a Spector ReBop 5. It has the same EMG =- HZ pickups as my last bass, but when I play at this one room, I get a nasty ground hum. It is worse when I am facing other directions, but never went away. I tried ground lifting the amp, but to no avail. Everything else in my setup is the same, and I never had this problem before. What should I do?