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What would be the problems with combining the stereo signal from a hifi pre-amp into a single mono input ie, the reverse of a single phono to two phono splitter?
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Splitting a line level signal with a simple Y-splitter cable adapter is completely different from the reverse situation of combining two outputs into one mono signal.
If you used a Y-splitter cable adapter in reverse you would essentially be shorting the two outputs of the pre-amp together - a real no-no.....
The only way to properly do this would be to purchase a combiner specifically designed to carry out this task. You can build your own from passive components, but it's not really desirable. An active device is required for proper isolation of the channels.
brucek