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09-22-15: Mofimadness
Al...ZD's suggestion doesn't address the OP's hook up question. It is software based, BUT, if the source in question can be switched to mono, then would a "Y" adapter work?"
If the OP uses software to convert stereo to mono, there is no hook up question. The same exact signal goes to the R & L channels. If actual components like a source or preamp has the ability co convert the signal to mono, its the same thing, as well. If you just have 1 mono amp, all you need to do is plug one of the channels into the amp. You don't need to combine the two.
09-22-15: Mofimadness
Al...ZD's suggestion doesn't address the OP's hook up question. It is software based, BUT, if the source in question can be switched to mono, then would a "Y" adapter work?"
If the OP uses software to convert stereo to mono, there is no hook up question. The same exact signal goes to the R & L channels. If actual components like a source or preamp has the ability co convert the signal to mono, its the same thing, as well. If you just have 1 mono amp, all you need to do is plug one of the channels into the amp. You don't need to combine the two.