Dave,
I am using a Y splitter now on my F15 HP along with your Sierra ELX Towers (incredible). So, one more time, in layman's terms, am I just getting more subwoofer volume than I would otherwise if I had a sub out on my amp? Whatever the case is, things sound amazing to me, particularly after I found the exact optimal room sub placement.
Thanks for your patience and terrific products.
Steve (in CO)