nondirectional below 80hz?

I think it's because of the huge 60Hz cabin gain that's throwing me off. I now have the lpf on the HU set to 80Hz, and also 80Hz on the external MTX x-over, so I think it's knocking the cabin gain down a good bit. I'm going to keep my front components h/p'd at 80Hz and tweak the EQ's to my liking. My system's nothing major.

It has taken me awhile to get it right, but I'm going to skip the idea of getting more subs. You all are right, it's pointless. I'll use the G5 to it's fullest -to 80Hz.

Please bare with me, I'm a -very- novice wannabe audiophile. I appreciate everyones input.

Correct.  Either disable one or set it way out of the passband of the other.

Alright, I'll disable the HU's lpf and only use the RTX01As.

My initial question was -or should have been- is 80Hz the absolute cutoff point for nondirectional sound or can it be a bit higher?

Thanks, everyone, for their input.

THX and most audio theorists say 80Hz is the frequency where sounds begin to become directional.  Some researchers think it is actually a little lower than that.

If you cannot bypass the Xover on the amp, setting it up at some higher frequency like 200Hz is the way to go.