I got one of the ATK-305's being blown out the other weekend. I took it to a gig on Saturday, but did not use it due to a fairly loud buzz. My usual rig is a G&L L-2500 (used passive only - no battery) into an Acoustic B200 amp. Active/Passive input change made no effect, ground switch had no effect. Buzz went away when I turned down the volume on the ATK. No buzz using the G&L. Is it possible something is faulty or am I just not compensating for something with the active vs. the passive? Thanks.