Purchased a new video camera with manual XLR\ninputs. However the microphone preamp has such\nlittle gain that I'm forced to use an external microphone\npreamp as a head-amplifier to drive the camera's\nXLR inputs.\n\nWhat type of microphones have sufficient gain to drive\nthese XLR inputs? What doesn't work: Shure KSM 27\n(104 ohms), AKG C420 (200 ohms) and Sennheiser ME66\n(200 ohms). A phone call to Canon tech support, they\ndidn't have any information on the microphone preamp\nspecifications. It was their_understanding_ that any 600\nohm microphone would work.