Is it okay to connect a subwoofer to two devices with a Y cable?
I tried that exact same thing back in my younger years and found out that the signals definitely back fed into each other and weakened the signal going to the subwoofer. Whether or not it would have burned out the equipment, I don't know because I immediately went back to the A/B switches I originally had used. The setups today are not made as well as the ones back when I did this so I'd shy away from trying it. Just get a two channel A/B switch. I'm sure they have remote control ones.