At the moment I am capturing voice using a Shure PG48 mic, hooked into my PC's soundcard mic jack. As the mic is in the next room, the cord is about 6 metres long.
Mainly I have too problems, 1 - that the audio i am capturing is incredibly low, meaning i have to boost it by 12db or more. This then leads to problem number 2 as there is an audiable hum which also gets boosted and as is quite annoying.
I have been told that a usb or firewire type device with xlr audio and a good inbuilt pre-amp will solve both of those problems and give me good, clean voice audio. The four models mentioned were:
Personally I like the presonus tube pre but you would need a mixing board ... Any usb preamp will give you a remarkable improvment in your sound ... Any one of the units that you have listed will do the job ........ WILLIE