I have a dynamic microphone here, a Sennheiser e835, that I would like to use with my brand new Flex 6600M but it doesn't seem to work using the BAL MIC input when selecting any one of the choices from the dropdown mic type list. My Sennheiser dynamic mic is not listed there. The Flex hand mic works fine installed as intended but my dynamic mic wont unless I use an outboard mic preamp, which I'd rather not do. One question I have is should I be using a dynamic mic with a higher level output, perhaps like the PR-781, or could I possibly have an XLR cable issue here? I have been successfully using a standard XLR to 1/4" TRS cable with the Sennheiser mic along with the mic preamp on another rig.