As Don Boomer has said, we find it hard to understand exactly what it is that you are asking.
If you are talking about Sennheiser's wonderful MK
E-2 lavalier microphone, then I am guessing that when you say that it is "too quiet", perhaps you mean that the one you have tried (wired as Don has indicated) is not as loud as a Line 6 microphone you may also have.
I would say to this that the "clean" way an XD-V wireless sends its signal (with almost NO
noise) means that the easiest "fix" (by far) would be for you to simply to use more gain at the input to whatever mixer or amplifier you are using.
Anything else would be much more complicated, because many
models of the MKE-2 have come from Sennheiser over the long time during which it has been available.
This long discussion from one year ago will give you a better idea of what I am talking about: http://line6.com/sup...84227?tstart=90