Eh hem!...Subwoofers... What do ya know?

I’ve always been able to hear where they are . And thats not good .

Then they are running higher than 80Hz.

To hear sound below 30 you need way too much volume. That would disturb my neighbors below.
And the peaks, valleys, and echo slap are too much to deal with.

Multiple (4 or 5) subwoofers ruin the bass sounstage.

This is entirely incorrect. There is no 'bass soundstate' at less than 80Hz; below that frequency bass is perceived as omnidirectional. It is the harmonics of the bass instruments that gives you the soundstage. In the meantime, multiple subs get rid of the 'peaks, valleys and echo slap' since bass 'echo slap' is what causes standing waves in any room.

Yes , if there is ideal placement and no distortion , timing on and on , the below 80 applies. Then its good . 

Everytime i hear a rig with a sub for 2 channel, i can HEAR the subwoofer, its not a balanced / natural tone to my ears

@redmosessc if you ever close to Miami lakes, FL let me know so you can come by and listen by yourself, I have 4 subs and you need to put your hand on the driver sometimes to check if these are working. Of course you can hear what they produce but not in the boomy subwoofery effect, very natural indeed

Then they are running higher than 80Hz.

Yeah that is a typical mistake I made myself years ago running them at 120 sometimes 150 and below, looking back, what was I thinking?

Just wanted to add that using the downloadable calculator here I think the measurements I entered fairly well replicate what I am hearing.

For fun I put in specs for speakers I am interested in and they really do add seem to alleviate the issues.

Assuming this calculator is symbolic of my issues of course.

I didn't enter what Focal says the low frequency roll off is, but rather Stereophile's summed measurement at -3db