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An engineer who once mentored me told me “if it rattles what do you do? You bolt it down.” This was in context with an electrical noise problem we had with a circuit we were developing and what he meant is make the signal source and load low impedance. With this in mind, I chose the speaker output of my sound card and have had no problems at all. Despite the high power output capability compared to the line output it doesn’t matter since it is the voltage and not the power which drives the line input to the transmitter. My experience has been that the voltage levels at the speaker output can be adjusted to be the same as the levels at the line outputs.
Be aware that some sound cards detect if a headphone is plugged in and the software switches to a lower level output and to “headphone mode” which is some sort of channel blending which reduces channel separation. On XP this can be reset and on 7 it can be turned off if necessary.-
I have had no problems with the mini phone plugs and jacks but have had many problems with the RCA phono connectors so I wouldn’t convert to the RCAs.