Most audio interfaces typically have a non-tube input circuit for "flat" signal response. here's a good article from our friends at Unique Squared to get you more informed in case you're interested. This is a whole discussion subject onto itself.
Preamps that have a tube in the circuit generally add color or "warmth" to the signal, as this is a characteristic of what a preamp vacuum tube will do. It was already explained previously, but the job of a preamp is to provide a stage of audio signal gain for Mic or Instrument signals. Perhaps this might've been what you meant by "not being able to get it to work"? You may need to attenuate (turn down) the master output of the BlueTube or alternately "pad" (soften/lower) the input at the audio interface, to reduce the potential of audio clipping/distortion of the signal. Most USB or Firewire audio interfaces such as the MBox 2 or our AudioBox USB unit are designed to accept a range of input signal level sources from the weakest (Mic) to hottest (Line) and in-between (Instrument- that is, the passive electric guitar/bass pickup output signal.Ī key to using a line-level output preamp device *before* the audio interface that will convert your audio signal to digital and pass it into your host recording computer system via USB or Firewire is that you need to make sure that the input is set to Line-Level for proper gain matching.
The output of the BlueTube (like most preamp units) is line-level. Not sure what the reason was, but a few things to keep in mind: I read through this thread and noticed your last post about not being able to get our BlueTube to work with your MBox 2 interface.
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