So, is it possible to mix a mono analogue LFE channel signal into a stereo L/R signal on both stereo channels on-the-fly, using a simple device (mixer?), with a possibility to adjust the volume of both sources in the output signal? Both stereo (front channels) and LFE signal are from the same 5.1 source.
And what could be the drawbacks of such mixing, maybe there can be some undesired effects on bass phase or the quality, dynamic range of the stereo signal. Or maybe the nature of LFE channel suggests that mixing it with a full range stereo signal digitally is preferred. Is there any risk for the speakers if such signals are mixed in analog, real-time?
Also, I'd like to do this with signals from pre-out outputs, that are after volume control, so their volume is quite low.