Tell me more...
What do you want this box to do?
IE:
Multipin connectors on all outputs or just one or two of the outputs with XLR outs for the remaining output?
Separate ground lifts on each channel, on each output or on just one or two outputs and the remaining always lifted or not...
What kind of wiring?: Canare, Mogami, Belden, etc.
Rack mountable box or stage box style?
What about the connectors?
How fast do you needs this?
That sort of thing -- The more information you can give me the best...
We may have sometime to make this box for you.
Furthermore, when you said 4 way are you including the direct output? Or are you looking for a five way splitter box. One direct and 4 secondary outputs? Jensen does make a 4 way splitter XFMR.