I'm new to field recording and I have a 744t, but channels 3&4 have to be line in. So if I want 4 mic channels, let's say Rode NT4 on 1&2 and Line Audio CM3 on 3&4, I need to get the 3&4 up to line level before they'll work. Last night I tried just plugging a mic into channel 3 and turning the gain up, but I had to turn it all the way up to barely hear anything.
I know in the studio a mic preamp would do this, but is there anything that would do that out in the field? a preamp or DI box or something? if you could let me know what people use that would be excellent. It seems like the MixPre-D, but what I've read only refers to it as a mixer, and I'm not sure if a bunch of gain on the MixPre-D and then even more gain on the Line level input would just equal a bunch of noise.