I think a big problem I had was where my seat was, after sitting in every other seat 2 were unbelievably bass heavy and of course my seat sucked lol. When I get the new power cord I will be able to put the sub where I want it to be so hopefully that will fix my issues along with your tips. I'm trying to think if the V3 has a bypass on the back?

Denon 2809, Emotiva XPA5, M80's, VP180, EP500