Crosstalk in Windows ?

I did a strange observation: When using a Sinusgenerator or Rew or Winmls, so no matter which Software: When using only one channel as output, so 100% Left and 0% right: I got on the left channel 120mV, but I get a the same signal as well with 40mV on the analog out of th right channel.

Initially I thought it is a cable cross talk or a weakness of the internal Laptop-Soundcard. I changed than the Soundcard and the cable to a Roland Quad capture and cinch cable....same result.

Is there anything I could do to bring to right channel to 0V ?

Sofar I had my left and right speaker connected and liked to switch via software in REW to measure first left and than right....but now I learned that the measurements in the far field at least are wrong as the woofers of both speakers add up...in my case it was a subwoofer integration where the right speaker had suddenly deep bass while I had a subwoofer only active for the left channel.
 
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Hi ,try to look for settings like stereo enhancement or 3d audio , or similar audio effects enabled in sound card software. Stereo widening effect mostly causes worse channel separation when enabled, and also phase is inverted on other channel.