[bobbb]

My DAC has one pair of balanced XLR Outputs only.
My active Studio Monitors are connected witth balanced XLR cables.

Now I connected a headphone amp with RCA Inputs only and the Monitors with a XLR Y-Cable and a XLR-RCA Adapter.
 
The XLR Adapter shortcuts pin1 and pin3.

So everything is wired, and it works, but the shortcut from pin1 and pin3 in the XLR-RCA Adapter makes all my wiring -also to the Studio Monitors- unbalanced ?
 
Is this a problem?
 

 

[nikongod]

It might be a problem, it might not Do the manuals for your monitors or DAC specify that they can be hooked up this way?
 
Assuming the manuals approve what you have done, but it still bugs you:
Get a pair of 10k:??? transformers to convert balanced to SE. Alternately there are some op-amp based solutions to the problem. 

 

[kalinowski]

In case you want to spend some decent amount of money to solve your problem
http://glass-ware.stores.yahoo.net/bcf9pinpcb.html