I hope I am missing a simple and obvious solution to this because I am tired of mind wrestling it over and over. Here is what I am trying to do:
I bought a Behringer B205d personal monitor speaker
http://www.behringer.com/EN/Products/B205D.aspx (for the sake of time, we'll leave my choice of products out of the equation, I know Behringer is probably not a favorite of too many member here) and I want to use it as a keyboardist/P&W Leader monitor. This way She can have control over the keyboard volume and vocal mix without affecting the other floor wedges. I only have two AUX sends so I can't dedicate a send to the B205d alone so I am trying to send the same signal to the B205d as to the amps that feed the other wedges.
*Note the stage box where our snake terminates has both a 1/4" and XLR jack for each send (I would think that the 1/4" jack is TRS balanced, but not positive). The problem here is that if I plug something into the 1/4" it cuts the signal to the XLR using both jacks at the same time is not an option.
Here are the ways I have tried to hook it up so far:
Stage box 1/4" >>> TRS Y cable >>> one side to floor wedge amp >>> other side to B205d.-------This does exactly what I want it to but it creates a buzz in the system. (ground loop I assume)
Stage box XLR >>> XLR Y cable >>> one side to floor wedge amp >>> other side to B205d.-------Same problem as above.
Stage box XLR >>> B205d input >>> B205d output >>> floor wedge amp--------No humming problems, but the mini mixer on the front panel alters the mix sent out from the B205d, this defeats the purpose of being able to independently control the volume of the keyboard.
Stage box >>> floor wedge amp input >>> input/thru on floor wedge amp >>> B205d-------The creates the mix I want and there are no humming problems, but I get very little volume out of the speakers. (is this due to an impedance mismatch? (still grasping impedance and how it affects things)
It seems to me the best solution is splitting the signal right out of the stage box, is there a way to eliminate the hum or ground loop?
I hope this makes a little sense; it is hard to put this all into words.