[MadCow]

Hi,
 
I'm thinking of making a cable to connect a pair of RCA outputs into a single 1/4" or 1/8" TRS stereo plug.
 
I read somewhere (but unfortunately can't recall exactly *where*) that simply just combining the two grounds from the RCA plugs isn't a good idea as it would introduce some noise and/or distortion to the signal. The recommended solution was to put a resistor "in between" the ground signals.
 
However, since I cannot find the website or forum that recommended this, I'm not sure exactly how this works or what resistor value to use. As far as I can tell, I can imagine two situations:
 
(hoping the forum won't screw up my lousy ascii art)
 
 
RCA  ............................................. TRS
 
(L+) ................................................... (T)
 
(L-) ............/\/\/\/.........o...................... (S)
(R-) ............/\/\/\/.........|
 
(R+) ................................................... (R)
 
 
-- OR --
 
 
RCA  ............................................. TRS
 
(L+) ................................................... (T)
 
(L-) ...................o................/\/\/\/........ (S)
(R-) ...................|
 
(R+) ................................................... (R)
 
 
(where /\/\/\/ is the resistor(s) and the |o is the part where the two signals meet)
 
 
Which is the correct one, or are they practically the same thing?
 
 
Thanks in advance!