Howdy Folks,
During a shoot I heard some strange crackling noises while using my Schoeps CMC 6/41microphone and powering it through my 302 Mixer, using Nickel Metal Hydride, Energizer 2500 MaH AA rechargeables. Thinking it was a bad cable, I swapped out my cables, and the noises remained. I then tried my other two inputs, the noises remained. Thinking it was my Schoeps crapping out, I swapped out to my Neuman KM 100, and still the noises remained. I then switched to a T powered Sennheiser 416, and the problem went away.
I sent the 302 to Sound Devices for servicing. They replaced 3 XLR inputs, 3 fader pots, both return pots, battery cap, updated to firmware 3.06, and a few other things. They never got the unit to make the same noises on the bench and it passed all of their bench tests. They said the Phantom powering looked good on all three inputs, and sent it back to me.
After shooting with it for four straight days, it was fine until the same problem, but more intense reoccured. The 302 is now back at Sound Devices. They want to give me a new battery spring, and feel the issue might be with using rechargeables. The Sound Device tech suggested I should use Duracell alkalines instead. I told him that was not an option and that I know a dozen people using ONLY Nickel Metal Hydride's.
Has anyone else had this problem? There is a suspicion that the problem is in using Nickel Metal Hydride rechargeable batteries. I've been using them for 6 years in this same exact configuration without a problem.
Any ideas out there?
Cheers,
Sean O'Neil
Brooklyn NY