millercarbon - please do NOT give engineering advice that looks serious. I understand that you might think this is a joke, but somebody may take your advice and potentially fry their receiver/amp. You never want to connect two outputs of anything into a single target, especially if they are speaker outputs from an amp/receiver.
Also, this is NOT the same thing as a Y connector. It is perfectly fine to use a Y-splitter to send a single output to multiple inputs. However, a special circuit is required if you want to "sum" multiple signals.
Also, this is NOT the same thing as a Y connector. It is perfectly fine to use a Y-splitter to send a single output to multiple inputs. However, a special circuit is required if you want to "sum" multiple signals.