Yeah I don’t mean to suggest that all subs now have built in splitters. On my older sub I always used a splitter and my old AVR also so I could run a pair. They are cheap enough that it’s worth a shot. I’ve tried it on my SVS because I find it to be less sensitive than I had hoped but seemed to make no difference in output. I end up setting it much higher than I’d like in both the AVR and it. I think I have it set to -6db and the AVR set to +6. Rather surprising considering the size of the PB 13. My Martin Logan dynamo is much more sensitive but being sealed and much smaller doesn’t deliver the umph of the SVS.