Electronics Repair Questions? Ask an Electronics Technician
Hello, What kind of mics are you using to speak into- are they condenser Mics?
The reason for the low sound would mean you need a Mic preamp to go between the Mics and the recorder. You would need- not the TP-911 telephone adapter- as Telephone and Mic are completely different impedances and signals. This will boost the signal up to 40 db and give more headroom while recording. The device you'd want to use is at the link below for purchase:
So Mics into Mixer, and Mixer XLR outs into the Marantz recorder is the solution.
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Do you need further assistance with this?