James:
 I recently picked up a used BP 4,2 from "Flebay".
The price was right,so I figured,"Why not'? The only physical issue,other than some scratches,is that the green LED light does not work. It looks a little bent. 
 Here is my question:
 I am using a 2B LP with RCA inputs,and I noticed that when I used the BP 4.2's XLR Outputs, the sound to the 2B was quite muffled.
This does not happen when using the BP 4.2's RCA Outputs.,(Thankfully.)
 I bought the RCA to XLR cables already wired,and I wonder if that is the cause.
 All the other inputs/outputs of the unit seem to work fine.
 Any help you can offer is greatly appreciated.
 Patrick