[LAU] Terrible mic ground noise

[jonetsu at teksavvy.com]

Le 31-03-2013 11:02, Len Ovens a écrit :

> Where does the mic get its power from? The M-Audio pulsar is a 
> phantom
> powered mic, the passive DI does not supply power and also would 
> block
> power from going through. The 1010lt does not mention sending phantom
> power... does the mic have a battery? (the user guide says it 
> requires
> phantom power, so no battery)

> From what you have said above and from looking up the HW you are 
> using,
> you should not be getting any audio through the mic at all. So if you 
> turn
> the gain up high enough you might get hum.

That must be the problem then.  The higher the volume, the higher the 
'ground' noise.

>>    The electric plug has only two prongs.  I though of getting some

> What electric plug?

The one to which the computer stuff is connected.  The house plug.  
Which is not a plug, but a box. That one does not have a ground wire as 
others do.  The two-AC plastic socket unit has no ground wire.

> However, assuming you have just described your setup incorrectly... 
> and
> there is a phantom power box and not a DI.

Thanks for the information !  Indeed the problem now is that the Pulsar 
has no power.  I shoudl start there. I've been using it for a long time 
like that ! ;-))  (or should it be: :-(() Was having fun though making 
music, but the noise was annoying.

Obviously I know nothing about those phantom power units.  Which one 
would you recommend ?  Will it simply be in the XLR path: mic -> power 
-> 1010LT ?

Also, now the passive DI box can be put to some other use.  Would it 
accept the 1/4" output of a small VOX guitar amplifier ?  What would be 
the difference in sound characteristics between using a DI box to the 
1010LT 2nd XLR input vs. not using one and connecting the same VOX 
output to a regular 10101LT input ?