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Can you please advise where you read that there is 5 volts available at the microphone input? The Sony website does not provide any information on this at their website specifications page.
I just spoke with dpa microphones tech support in Colorado and they advised that using their model 6001 adapter which converts the microdot connector to XLR that they pass slightly over 8 volts to the microphone when connected to a 48P phantom power source. My a/d microphone preamplifier also provides 9.0 volts to the microphones, so although you may be able to use the Sony PCM DR100 recorder and power the microphones directly from the mic input you most likely are not getting the proper voltage required to the microphone capsules for optimum performance at higher sound pressure levels. Since dpa verified this information I will continue using my current setup as the Sony recorder will provide no improvement to a digital signal sent to it from a toslink source.