I believe the reasoning behind his reply is that not all amplifiers sum the inputs, in which case, even though you are feeding it a mono signal, you will only have output on the right or left side (whichever you have connected at input) The simple solution is to feed both left and right inputs.
This is why he mentioned that you can sum the inputs OR the rca outputs on the lc2, but if you use the outputs to sum pre-amplifier, you need to use the left side input on the lc2 for signal sensing turn-on.
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